A control method and device of an air conditioning system, the air conditioning system and a storage medium

Abstract

The application relates to a control method and device of an air conditioning system, the air conditioning system and a storage medium. The method comprises the following steps: in the case that an indoor environment of the air conditioning system is in a stable state, determining a target working condition of the air conditioning system; according to the target working condition, determining a corresponding adjustment strategy of the air conditioning system, the adjustment strategy being used for gradually adjusting an adjustment object in the air conditioning system; executing the adjustment strategy to gradually adjust the adjustment object, and in the adjustment process, controlling a fan coil in the air conditioning system to maintain the indoor environment in the stable state; in the adjustment process, determining a system total power consumption corresponding to the air conditioning system after each step of adjustment; after the execution of the adjustment strategy is completed, controlling a fresh air fan and / or a fresh air water valve based on parameter information of the adjustment object corresponding to the minimum system total power consumption among the system total power consumptions. The application reduces the total power consumption of the air conditioning system under the premise of guaranteeing the stability of the indoor environment, and can meet higher energy-saving requirements.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, and in particular to a control method, device, air conditioning system and storage medium for an air conditioning system. Background Technology

[0002] With the increasing demands for improved cooling energy efficiency in public buildings, medium-temperature water-cooled air conditioning systems (including fan coil units and fresh air units) are widely used due to their advantage of improved cooling efficiency. Currently, these systems typically use variable frequency fans for fresh air units, allowing for stepless speed regulation; fan coil units offer multi-speed adjustment. However, in terms of control logic, the conventional approach of independently adjusting fan coil units and fresh air units is still widely adopted. The fresh air unit maintains a fixed supply air temperature, adjusting the fresh air volume only according to changes in indoor carbon dioxide concentration; the fan coil unit maintains a fixed supply air temperature, adjusting the fan speed only according to indoor return air temperature. In scenarios involving changes in outdoor fresh air conditions or fluctuations in indoor load, the adjustments of each device are unrelated. This type of air conditioning system can only achieve localized stable operation of individual devices, resulting in high overall energy consumption and difficulty in meeting higher energy-saving requirements. Summary of the Invention

[0003] This application provides a control method, device, air conditioning system, and storage medium for an air conditioning system to solve the problem that the overall energy consumption of existing medium-temperature water air conditioning systems is too high and it is difficult to meet higher-level energy-saving requirements.

[0004] In a first aspect, this application provides a method for controlling an air conditioning system, comprising: Under the condition that the indoor environment of the air conditioning system is in a stable state, the target operating condition of the air conditioning system is determined. Based on the target operating conditions, a corresponding adjustment strategy for the air conditioning system is determined. The adjustment strategy indicates that the adjustment objects in the air conditioning system are adjusted step by step. The adjustment objects include at least one of the following: the operating frequency of the fresh air unit in the air conditioning system and the opening degree of the fresh air water valve of the fresh air unit. The adjustment strategy is executed to gradually adjust the object to be adjusted, and during the adjustment process, the fan coil units in the air conditioning system are controlled to maintain the indoor environment in a stable state. During the adjustment process, the total system power consumption of the air conditioning system after each adjustment step is determined; After the adjustment strategy is executed, the fresh air fan and / or the fresh air valve are controlled based on the parameter information of the adjustment object corresponding to the system with the minimum total power consumption among all the system total power consumption.

[0005] Secondly, this application provides a control device for an air conditioning system, comprising: The determination module is used to determine the target operating condition of the air conditioning system when the indoor environment of the air conditioning system is in a stable state. The determining module is further configured to determine the adjustment strategy corresponding to the air conditioning system based on the target operating condition. The adjustment strategy indicates that the adjustment objects in the air conditioning system are adjusted step by step. The adjustment objects include at least one of the following: the operating frequency of the fresh air unit in the air conditioning system and the opening degree of the fresh air water valve of the fresh air unit. The control module is used to execute the adjustment strategy to gradually adjust the adjustment object, and during the adjustment process, control the fan coil unit in the air conditioning system to maintain the indoor environment in a stable state. The determining module is also used to determine the total system power consumption of the air conditioning system after each adjustment step during the adjustment process. The control module is further configured to, after completing the execution of the adjustment strategy, control the fresh air unit and / or the fresh air valve based on the parameter information of the adjustment object corresponding to the system with the minimum total power consumption among the various systems.

[0006] Thirdly, this application provides an air conditioning system, including: a processor and a memory; the processor is used to execute a control program for the air conditioning system stored in the memory to implement the control method for the air conditioning system as described above.

[0007] Fourthly, this application provides a storage medium storing one or more programs that can be executed by one or more processors to implement the control method of the air conditioning system as described above.

[0008] Compared with the prior art, the technical solution provided in this application has the following advantages: the control method for the heat pump system provided in this application includes determining the target operating condition of the air conditioning system when the indoor environment of the air conditioning system is in a stable state; determining the corresponding adjustment strategy of the air conditioning system according to the target operating condition, wherein the adjustment strategy indicates that the adjustment objects in the air conditioning system are gradually adjusted, and the adjustment objects include at least one of the following: the operating frequency of the fresh air unit in the air conditioning system and the opening degree of the fresh air and water valve of the fresh air unit; executing the adjustment strategy to gradually adjust the adjustment objects, and controlling the fan coil unit in the air conditioning system to maintain the indoor environment in a stable state during the adjustment process; determining the total system power consumption of the air conditioning system after each adjustment step during the adjustment process; and controlling the fresh air unit and / or the fresh air and water valve based on the parameter information of the adjustment object corresponding to the minimum total system power consumption among the various total system power consumptions. Through the above methods, this embodiment first stabilizes the indoor environment, then determines the corresponding adjustment strategy based on the target operating conditions. At least one of the following is adjusted step-by-step: the operating frequency of the fresh air unit and the opening degree of the fresh air / water valve. During the adjustment process, the fan coil unit is controlled to maintain indoor environmental stability. Finally, based on the total system power consumption after each adjustment step, the adjustment parameter corresponding to the minimum total system power consumption is selected to control the fresh air unit and / or the fresh air / water valve. This decouples multiple previously mutually coupled adjustment parameters into independent adjustment dimensions that can be optimized step-by-step according to the target operating conditions. This breaks through the limitation of existing technologies that can only achieve localized stable operation of a single device, realizing global collaborative optimization control with the goal of minimizing the total power consumption of the air conditioning system. This reduces the total power consumption of the air conditioning system while ensuring indoor environmental stability, meeting higher energy-saving requirements. Attached Figure Description

[0009] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0010] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0012] Figure 1 A schematic diagram of an air conditioning system provided in an embodiment of this application; Figure 2 A flowchart illustrating a control method for an air conditioning system provided in an embodiment of this application; Figure 3 A flowchart illustrating another air conditioning system control method provided in an embodiment of this application; Figure 4(a) is a schematic diagram of the execution flow of an adjustment strategy corresponding to a first working condition / second working condition provided in an embodiment of this application; Figure 4(b) is a schematic diagram of the execution flow of the adjustment strategy corresponding to a third operating condition provided in an embodiment of this application; Figure 4(c) is a schematic diagram of the execution flow of the adjustment strategy corresponding to another third operating condition provided in the embodiment of this application; Figure 5 A schematic diagram of the structure of a control device for an air conditioning system provided in an embodiment of this application; Figure 6 This is a schematic diagram of another air conditioning system provided in an embodiment of this application. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0014] The following disclosure provides numerous different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0015] refer to Figure 1 , Figure 1 This is a schematic diagram of an air conditioning system provided in an embodiment of this application. The air conditioning system provided in this embodiment is an energy-saving system, comprising a fan coil unit 1, a fresh air unit 2, a coil water valve 3, and a fresh air water valve 4.

[0016] The outlet air temperature sensor 6 of fan coil unit 1 is located at the outlet of fan coil unit 1, the return air temperature sensor 7 of fan coil unit 1 is located at the return air inlet of fan coil unit 1, the outlet air temperature and humidity sensor 8 of fresh air unit 2 is located at the outlet of fresh air unit 2, the inlet air temperature and humidity sensor 9 of fresh air unit 2 is located at the inlet of fresh air unit 2, and the indoor temperature and humidity sensor 10 is located indoors.

[0017] Regarding water connections, the chilled water supply pipeline in the air conditioning system is divided into two branches: one branch connects to the heat exchange coil of fan coil unit 1 via coil water valve 3, and the other branch connects to the heat exchange coil of fresh air unit 2 via fresh air water valve 4. The return water from the two branches merges and returns to the refrigeration room via the chilled water return pipeline. Coil water valve 3 is connected in series on the chilled water supply branch of fan coil unit 1. By adjusting the valve opening, the flow rate of chilled water through fan coil unit 1 is controlled, thereby adjusting the cooling capacity of fan coil unit 1. Fresh air water valve 4 is connected in series on the chilled water supply branch of fresh air unit 2. By adjusting the valve opening, the flow rate of chilled water through fresh air unit 2 is controlled, thereby adjusting the cooling capacity of fresh air unit 2.

[0018] Regarding the airflow connection, fan coil unit 1 is installed indoors, with its air inlet connected to the indoor air. It draws in return air from the room, cools it through the heat exchange coil, and then delivers the treated air back into the room through the air outlet, handling both the sensible and latent heat loads. Fresh air unit 2's air inlet is connected to the outdoor atmosphere. A temperature and humidity sensor 9 for the inlet of fresh air unit 2 is installed at this inlet to monitor the temperature and humidity of the outdoor fresh air in real time. Fresh air unit 2 draws in fresh air from the outside, cools it through the heat exchange coil, and then delivers the treated fresh air back into the room through the air outlet. A temperature and humidity sensor 8 for the outlet of fresh air unit 2 is installed at this outlet to monitor the outlet temperature and humidity of the fresh air unit 2 in real time. Fresh air unit 2 handles the fresh air load and, together with fan coil unit 1, maintains the indoor temperature and humidity environment.

[0019] refer to Figure 2 , Figure 2 This is a flowchart illustrating a control method for an air conditioning system provided in an embodiment of this application. The control method for the air conditioning system provided in this embodiment includes the following steps: S201: Under the condition that the indoor environment of the air conditioning system is in a stable state, determine the target operating condition of the air conditioning system.

[0020] In this embodiment, a stable indoor environment can be understood as the indoor temperature, indoor humidity, and indoor carbon dioxide concentration in the area where the air conditioning system operates (i.e., the indoor environment) have all reached the preset requirements.

[0021] The target operating condition can be understood as the type of operating condition determined based on the comparison between the current outdoor air condition and the indoor air condition.

[0022] Specifically, under stable indoor conditions, the system acquires outdoor and indoor temperature and humidity data. The outdoor enthalpy and indoor enthalpy are calculated based on the outdoor and indoor temperature and humidity data, respectively. Enthalpy is a thermodynamic parameter characterizing the energy state of air, comprehensively reflecting both temperature and humidity. Indoor temperature and humidity data are collected using an indoor temperature and humidity sensor, while outdoor temperature and humidity data are collected using an air intake temperature and humidity sensor from the fresh air unit. The outdoor and indoor enthalpy are calculated using standard thermodynamic formulas, which can be found in existing technologies and will not be elaborated upon in this embodiment.

[0023] After obtaining the outdoor and indoor air enthalpy values, the target operating condition of the air conditioning system is determined based on the comparison between the outdoor and indoor air enthalpy values.

[0024] The stable state of the indoor environment described above can be determined in the following ways: After the air conditioning system is started, the opening of the fan coil water valve is controlled so that the air outlet temperature of the fan coil unit reaches the first preset air supply temperature, and the operating frequency of the fan coil unit is controlled so that the indoor ambient temperature reaches the preset temperature threshold and the indoor ambient humidity reaches the preset humidity threshold. Control the opening of the fresh air and water valve of the fresh air unit so that the outlet air temperature of the fresh air unit reaches the second preset supply air temperature, and control the operating frequency of the fresh air unit so that the carbon dioxide concentration in the indoor environment is less than the preset concentration threshold. When the ambient temperature reaches a preset temperature threshold, the ambient humidity reaches a preset humidity threshold, and the indoor carbon dioxide concentration is less than a preset concentration threshold, the indoor environment is determined to be in a stable state.

[0025] The first preset supply air temperature can be understood as the target value for the outlet air temperature set for the fan coil unit. This first preset supply air temperature is predetermined based on the equal-state air supply design of the air conditioning system, for example, it can be set to 12℃. Its function is to provide a clear adjustment benchmark for the outlet air temperature of the fan coil unit, so that the air supply state of the fan coil unit is stabilized at the state point required by the design.

[0026] The second preset air supply temperature can be understood as the target value for the outlet air temperature set for the fresh air unit. This second preset air supply temperature is also predetermined based on the equal-state air supply design and works in conjunction with the first preset air supply temperature; for example, it can be set to 17℃. Its function is to provide a clear adjustment benchmark for the outlet air temperature of the fresh air unit, so that the air supply state of the fresh air unit is stabilized at the design requirement.

[0027] The preset temperature threshold refers to the target value that the indoor ambient temperature should reach, such as 24℃. The preset humidity threshold refers to the target value that the indoor ambient humidity should reach, such as 50% relative humidity. The preset concentration threshold refers to the upper limit that the indoor carbon dioxide concentration should be maintained at, such as 1000ppm.

[0028] Specifically, after the air conditioning system is started, the fan coil units and the fresh air unit are first controlled in a coordinated manner. On the fan coil unit side, the opening of the fan coil water valve is controlled to ensure that the outlet air temperature of the fan coil unit reaches the first preset supply air temperature; at the same time, the operating frequency of the fan coil unit is controlled to ensure that the indoor temperature and humidity reach the preset temperature threshold and the preset humidity threshold, respectively. On the fresh air unit side, the opening of the fresh air water valve is controlled to ensure that the outlet air temperature of the fresh air unit reaches the second preset supply air temperature; at the same time, the operating frequency of the fresh air unit is controlled to ensure that the indoor carbon dioxide concentration is lower than the preset concentration threshold.

[0029] The opening degree of the water valve of the aforementioned fan coil unit is responsible for stabilizing the outlet air temperature of the fan coil unit at the first preset supply air temperature, and the operating frequency of the fan coil unit is responsible for ensuring that the indoor temperature and humidity meet the standards. The opening degree of the fresh air water valve of the fresh air unit is responsible for stabilizing the outlet air temperature of the fresh air unit at the second preset supply air temperature, and the operating frequency of the fresh air unit is responsible for ensuring that the indoor carbon dioxide concentration is below the preset concentration threshold. These four adjustment actions can be executed in parallel, allowing the air conditioning system to gradually approach a globally stable operating state.

[0030] Continuously monitor the indoor environment's temperature, humidity, and carbon dioxide concentration. When the ambient temperature reaches a preset threshold, the ambient humidity reaches a preset threshold, and the indoor carbon dioxide concentration is below a preset threshold, the indoor environment is considered to have reached a stable state. At this point, proceed with the subsequent target condition determination steps.

[0031] Through the above methods, this embodiment implements equal-state air supply control after the air conditioning system is started, so that the fan coil unit and the fresh air unit each reach the preset air supply state point. At the same time, the indoor temperature, humidity and carbon dioxide concentration meet the preset requirements, so as to achieve accurate determination of the stable state of the air conditioning system. Through multi-level judgment conditions, it is ensured that the air conditioning system has truly reached a stable operating state before subsequent adjustment operations are carried out, thereby improving the reliability of control.

[0032] S202: Determine the corresponding adjustment strategy for the air conditioning system based on the target operating conditions.

[0033] In this embodiment, the adjustment strategy instructs for gradual adjustment of the adjustment objects in the air conditioning system. The adjustment objects include at least one of the following: the operating frequency of the fresh air unit in the air conditioning system and the opening degree of the fresh air / water valve of the fresh air unit. The adjustment strategy refers to a pre-set adjustment method based on different operating conditions, and its function is to provide targeted adjustment guidance for the air conditioning system.

[0034] Specifically, after determining the target operating condition, a corresponding adjustment strategy is selected based on that condition. This adjustment strategy clearly indicates which parameter(s) should be adjusted, and the corresponding direction of adjustment. For example, under a certain target operating condition, if the outdoor fresh air condition is poor, increasing the fresh air supply will only lead to an increase in the total power consumption of the air conditioning system. In this case, the adjustment strategy could indicate maintaining the operating frequency of the fresh air unit unchanged, and only adjusting the opening of the fresh air water valve in a gradually decreasing direction.

[0035] S203: Implement adjustment strategies to gradually adjust the object being adjusted, and during the adjustment process, control the fan coil units in the air conditioning system to maintain a stable indoor environment.

[0036] In this embodiment, stepwise adjustment refers to the process of adjusting the valve opening or frequency step by step according to a preset step size, in order to achieve fine control of the operating parameters of the air conditioning system.

[0037] Specifically, after determining the adjustment strategy, the adjustment object is gradually adjusted according to the adjustment object and direction indicated by the strategy, with a preset fixed step size. After each adjustment step, the air conditioning system is allowed to stabilize before proceeding to the next adjustment step, until the stopping condition corresponding to the adjustment strategy is met. Throughout the gradual adjustment process, the fan coil units in the air conditioning system are continuously controlled, and their operating frequency and the opening of the coil water valves are adaptively adjusted according to the real-time changes in the indoor ambient temperature and humidity to maintain the indoor ambient temperature and humidity within their respective preset threshold ranges, ensuring that the indoor environment does not deviate from a stable state due to parameter adjustments on the fresh air unit side.

[0038] S204: During the adjustment process, determine the total system power consumption of the air conditioning system after each adjustment step.

[0039] In this embodiment, the total system power consumption refers to the sum of the power of all relevant equipment after each adjustment step of the air conditioning system is completed. Specifically, the total system power consumption includes the power of the fresh air unit, the power of the fan coil unit, and the power of the cooling source equipment. As a global evaluation indicator for measuring the overall energy consumption of the air conditioning system, rather than considering only the local power consumption of a single device, the total system power consumption comprehensively reflects the energy balance between the air and water systems, providing a reliable basis for selecting the truly optimal operating parameters.

[0040] Specifically, after each adjustment step, the total system power consumption of the air conditioning system under that adjustment state is obtained. The total system power consumption is the sum of the power of the fresh air unit, the power of the fan coil unit, and the power of the cooling source equipment. For example, if the power of the fresh air unit in a certain adjustment step is 0.5 kW, the power of the fan coil unit is 0.3 kW, and the power of the cooling source equipment is 2.0 kW, then the total system power consumption for that step is 2.8 kW. The cooling source equipment is a combination of equipment that centrally produces and delivers cooling capacity in the air conditioning system, specifically including a chiller, chilled water pump, cooling water pump, and cooling tower. The chiller consumes electricity to produce chilled water, the chilled water pump delivers the chilled water to the fan coil unit and the fresh air unit, and the cooling water pump and cooling tower together dissipate the heat generated by the chiller during operation to the outdoor atmosphere. The power consumed by the cooling source equipment during operation, together with the power of the fresh air unit and the fan coil unit, constitutes the total system power consumption.

[0041] S205: After the adjustment strategy is executed, the fresh air unit and / or fresh air and water valve are controlled based on the parameter information of the adjustment object corresponding to the system with the minimum total power consumption among all systems.

[0042] In this embodiment, after all the step-by-step adjustments indicated by the adjustment strategy are completed, the total power consumption of each recorded step is compared with each other, and the adjustment step with the smallest total power consumption is selected. The parameter information of the adjustment object corresponding to the adjustment step, namely the operating frequency of the fresh air fan and / or the opening degree of the fresh air and water valve, is used as the final control parameters. Based on this, the fresh air fan and / or the fresh air and water valve are controlled so that the air conditioning system continues to operate with the control parameter combination that minimizes the total power consumption of the system.

[0043] It should be noted that, to avoid the problem of extremely poor anti-interference capability of the optimization result, after the execution of the adjustment strategy and obtaining the total power consumption of multiple systems, the first remaining adjustment margin of the fresh air and water valve, the second remaining adjustment margin of the fan coil unit's operating frequency, and the third remaining adjustment margin of the coil water valve are determined after each adjustment step. At least one candidate system total power consumption is determined from the multiple system total power consumptions, where the first remaining adjustment margin corresponding to the candidate system total power consumption is greater than the first margin threshold, the second remaining adjustment margin is greater than the second margin threshold, and the third remaining adjustment margin is greater than the third margin threshold. Based on the parameter information of the adjustment object corresponding to the candidate system total power consumption with the smallest total power consumption among all candidate systems, the fresh air fan and / or fresh air and water valve are controlled. This avoids the defect of the pure supply and consumption optimal solution being close to the instability boundary, improves the air conditioning system's resistance to operating condition fluctuations, ensures the long-term stability of the indoor environment, and guarantees the actual long-term energy-saving benefits under dynamic operating conditions.

[0044] This embodiment provides a control method for an air conditioning system. First, the indoor environment is brought to a stable state. Then, a corresponding adjustment strategy is determined based on the target operating conditions. At least one of the operating frequency of the fresh air unit and the opening degree of the fresh air / water valve is adjusted step by step. During the adjustment process, the fan coil unit is controlled to maintain indoor environmental stability. Finally, based on the total system power consumption after each adjustment step, the adjustment parameter corresponding to the minimum total system power consumption is selected to control the fresh air unit and / or the fresh air / water valve. This decouples multiple previously mutually coupled adjustment parameters into independent adjustment dimensions that can be optimized step-by-step according to the target operating conditions. This breaks the limitation of existing technologies that can only achieve localized stable operation of a single device, realizing global collaborative optimization control with the goal of minimizing the total power consumption of the air conditioning system. This reduces the total power consumption of the air conditioning system while ensuring indoor environmental stability, meeting higher energy-saving requirements.

[0045] refer to Figure 3 , Figure 3 This is a flowchart illustrating another air conditioning system control method provided in this application embodiment. The air conditioning system control method provided in this embodiment includes the following steps: S301: Determine the target operating condition of the air conditioning system when the indoor environment of the air conditioning system is in a stable state.

[0046] In this embodiment, step S301 is the same as step S201 described above. For details, please refer to step S201 described above. This embodiment will not repeat the details here.

[0047] S302: Determine the corresponding adjustment strategy for the air conditioning system based on the target operating conditions.

[0048] In this embodiment, the target operating conditions include a first operating condition, a second operating condition, and a third operating condition. The first operating condition indicates that the outdoor air enthalpy corresponding to the outdoor environment where the air conditioning system is located is greater than the indoor air enthalpy corresponding to the indoor environment, and the indoor air enthalpy corresponding to the indoor environment is greater than a preset air enthalpy. The second operating condition indicates that the outdoor air enthalpy corresponding to the outdoor environment where the air conditioning system is located is less than the preset air enthalpy, and the indoor air enthalpy corresponding to the indoor environment is greater than the preset air enthalpy. The third operating condition indicates that the indoor air enthalpy corresponding to the indoor environment is greater than the preset air enthalpy and less than the outdoor air enthalpy corresponding to the outdoor environment where the air conditioning system is located.

[0049] The preset air enthalpy value can be understood as the air enthalpy value corresponding to the air supply state point determined during the design phase of the air conditioning system, i.e., the enthalpy value at the design air supply point 0. The preset air enthalpy value is a fixed reference value calculated based on the indoor design temperature and humidity requirements and the selection parameters of the air conditioning system. The preset air enthalpy value serves as a critical threshold for determining whether outdoor fresh air has the value of being used as a free cooling source. When the outdoor air enthalpy value is greater than the preset air enthalpy value, it indicates that the energy level of the outdoor fresh air is higher than the design air supply state point, and the fresh air only has a certain degree of utilization potential, still requiring processing in conjunction with the chilled water equipment in the air conditioning system. When the outdoor air enthalpy value is less than or equal to the preset air enthalpy value, it indicates that the outdoor fresh air itself has a lower enthalpy level, and the air conditioning system can prioritize utilizing its natural cooling capacity to reduce cooling demand, thereby reducing the energy consumption of the cooling source equipment.

[0050] After the indoor environment reaches a stable state, the ambient temperature and humidity of both the outdoor and indoor environments are first acquired, and the outdoor and indoor air enthalpy values ​​are calculated respectively. The indoor air enthalpy value can be calculated based on the indoor ambient temperature and humidity using standard thermodynamic formulas (refer to existing technologies). Similarly, the outdoor air enthalpy value can be calculated based on the outdoor ambient temperature and humidity using thermodynamic formulas. Based on the comparison between the outdoor air enthalpy value, the indoor air enthalpy value, and the preset air enthalpy value, the target operating condition of the current air conditioning system is determined, and the corresponding adjustment strategy is selected accordingly.

[0051] When the outdoor air enthalpy is greater than the indoor air enthalpy, and the indoor air enthalpy is greater than the preset air enthalpy, the air conditioning system is determined to be in the first operating condition. Under this condition, the outdoor air's thermal and moisture energy is higher than the indoor air's. Introducing fresh outdoor air not only fails to cool and dehumidify but also increases the air conditioning system's thermal and moisture load; therefore, the fresh air is not usable. The determined adjustment strategy for this first operating condition is the first adjustment strategy. This first adjustment strategy instructs that the operating frequency of the fresh air unit be maintained constant, and the adjustment is only applied to the opening of the fresh air water valve, gradually decreasing it. The principle is that, under poor outdoor fresh air conditions, the minimum necessary fresh air volume is maintained to meet the indoor carbon dioxide concentration requirements. Simultaneously, by gradually closing the fresh air water valve, part of the cooling load originally borne by the fresh air unit is transferred to the fan coil unit, finding the balance point with the lowest total power consumption between the air system and the water system.

[0052] When the outdoor air enthalpy is less than or equal to the preset air enthalpy and the indoor air enthalpy is greater than the preset air enthalpy, the air conditioning system is determined to be in the second operating condition. Under the second operating condition, the thermal and moisture energy of the outdoor air is lower than the energy level of the design air supply point, and the outdoor fresh air itself has sufficient cooling and dehumidification capacity, and can be directly used as a free cold source.

[0053] For the second operating condition, the determined adjustment strategy is also the first adjustment strategy. This first adjustment strategy instructs: maintain the operating frequency of the fresh air unit constant, control the opening of the fresh air water valve to its maximum, and adjust the opening of the fresh air water valve gradually in a decreasing direction. The principle is that, under the second operating condition, the outdoor air enthalpy is lower than the preset air enthalpy. The outdoor fresh air itself has a lower enthalpy level, so its natural cooling capacity can be preferentially utilized to reduce cooling demand. Simultaneously, by gradually closing the fresh air water valve, part of the cooling load originally borne by the fresh air unit is transferred to the fan coil unit side, finding the balance point with the lowest total power consumption between the air system and the water system.

[0054] When the indoor air enthalpy is greater than the outdoor air enthalpy, and the outdoor air enthalpy is greater than the preset air enthalpy, the current air conditioning system is determined to be in the third operating condition. In the third operating condition, the outdoor air enthalpy is lower than the indoor air enthalpy but higher than the preset air enthalpy, indicating that the outdoor fresh air has some cooling potential, but has not yet reached the enthalpy level of the design air supply point, and still needs to be processed in conjunction with chilled water equipment. To avoid increased dehumidification energy consumption or waste of natural cooling sources due to blindly increasing or decreasing the fresh air volume without distinguishing humidity conditions, it is necessary to further refine and determine the true adjustment strategy corresponding to the current air conditioning system. Specifically, this involves obtaining the outdoor air humidity corresponding to the air conditioning system; determining the comparison result between the air humidity and the preset humidity threshold; and determining the corresponding adjustment strategy for the air conditioning system based on the comparison result.

[0055] When the outdoor air humidity exceeds the preset humidity threshold, it indicates that the fresh air is too humid, and introducing fresh air will increase the dehumidification burden on the air conditioning system. The adjustment strategy determined in this case is the second adjustment strategy. This second adjustment strategy instructs: first, the operating frequency of the fresh air unit is used as the adjustment target, and it is adjusted in a gradually decreasing direction to find an economical fresh air volume that meets indoor environmental requirements; after the frequency is locked, the opening of the fresh air condensate valve is then used as the adjustment target, and it is adjusted in a gradually decreasing direction.

[0056] When the outdoor air humidity is less than or equal to the preset humidity threshold, it indicates that the fresh air is too dry. Introducing fresh air can utilize its drying characteristics to assist in dehumidification. The adjustment strategy determined at this time is the third adjustment strategy. This third adjustment strategy indicates: first, the operating frequency of the fresh air unit is used as the adjustment target, and it is adjusted in a gradually increasing direction to make full use of the natural cold source and drying characteristics of the outdoor fresh air; after the frequency is locked, the opening of the fresh air water valve is used as the adjustment target, and it is adjusted in a gradually decreasing direction.

[0057] S303: When the adjustment strategy is the first adjustment strategy, the operating frequency of the fresh air unit is kept constant and the opening of the fresh air and water valve is controlled to the maximum opening. The opening of the fresh air and water valve is gradually reduced according to the first preset step size until any stop condition is met, and the adjustment of the opening of the fresh air and water valve is stopped.

[0058] In this embodiment, the stopping conditions include: the opening degree of the fresh air water valve reaching the minimum opening degree and the adjustment capacity of the fan coil unit reaching a preset capacity threshold. The maximum opening degree can be understood as the fresh air water valve being opened to the maximum position allowed by its physical travel, and unable to be opened further; the minimum opening degree can be understood as the fresh air water valve being closed to the minimum position allowed by its physical travel, and unable to be closed further. The fan coil unit's adjustment capacity reaching the preset capacity threshold can be understood as the fan coil unit's own adjustment capacity being fully utilized to the preset upper limit level during the adaptive following process. For example, the fan coil unit's operating frequency has been adjusted to the maximum upper limit, and the air volume cannot be increased further; or the fan coil unit's coil water valve opening has been adjusted to the maximum upper limit, and the chilled water flow cannot be increased further. When the fan coil unit has reached the upper limit of its adjustment capacity, if the opening degree of the fresh air water valve continues to decrease, the additional heat and humidity load transferred from the fresh air fan side will not be effectively handled by the fan coil unit, which may cause the indoor environment to deviate from a stable state. Therefore, the optimization process must be terminated to ensure that indoor comfort is not affected.

[0059] Before executing the step of gradually reducing the opening of the fresh air and water valve according to the first preset step size, the opening of the fresh air and water valve is controlled to decrease starting from its maximum opening to determine the target opening boundary of the fresh air and water valve that keeps the indoor environment in a stable state. Starting from the target opening boundary, the step of gradually reducing the opening of the fresh air and water valve according to the first preset step size is executed. In this way, by pre-determining the target opening boundary of the fresh air and water valve that can maintain the stability of the indoor environment before the formal step adjustment, a safe optimization range is defined. This avoids the instability of the indoor environment during the optimization process, ensuring indoor comfort, and also ensures that the subsequent power consumption optimization data are all effective steady-state data, improving the reliability and accuracy of extreme value optimization.

[0060] Specifically, when executing the first adjustment strategy corresponding to the first operating condition, before the adjustment begins, the constraint of the constant setpoint of the fresh air supply temperature is first removed, and the fixed supply temperature is no longer used as the control target, allowing the fresh air supply temperature to fluctuate freely. Subsequently, the opening degree of the fresh air water valve is adjusted to the fully open state as the starting point of the adjustment.

[0061] First, boundary positioning is performed. Starting from the fully open state, the fresh air and water valve is gradually closed, while simultaneously monitoring the indoor temperature and humidity. This continues until the indoor environment reaches a critical value where it is just maintaining a stable state. The opening degree of the fresh air and water valve at this point is recorded as the target opening degree boundary, defining the effective range for formal optimization. Based on this, the opening degree of the fresh air and water valve is gradually reduced according to a first preset step size (e.g., 5%). After each step of opening reduction, the air conditioning system is allowed to stabilize. During this process, the fan coil unit adaptively adjusts its operating frequency and the opening degree of the coil water valve according to real-time changes in indoor temperature and humidity to maintain the indoor temperature and humidity within their respective preset threshold ranges. When the reduced cooling capacity on the fresh air side due to the reduced water valve causes a gap in the indoor load, the fan coil unit automatically increases its output to fill the gap, ensuring the indoor environment remains stable throughout the optimization process.

[0062] After each adjustment step is completed and the air conditioning system is running stably, the total power consumption of the air conditioning system under that adjustment state is obtained. The total power consumption of the system is the sum of the power of the fresh air unit, the power of the fan coil unit, and the power of the cooling source equipment.

[0063] Continue performing the above-described operation of gradually reducing the opening of the fresh air and water valve until any of the above-mentioned stopping conditions are met, then stop the adjustment and the optimization process ends.

[0064] After the adjustment stops, the total power consumption of the system at each step is compared with each other, and the step with the lowest total power consumption is selected. The operating frequency of the fresh air fan corresponding to this step is taken as the optimal operating frequency, and the opening degree of the fresh air water valve corresponding to this step is taken as the optimal opening degree. Based on this, the fresh air fan and the fresh air water valve are controlled so that the air conditioning system continues to operate at the opening degree value with the lowest total power consumption.

[0065] The first adjustment strategy corresponding to the second operating condition is completely consistent with the first adjustment strategy corresponding to the first operating condition. Compared with the first operating condition, the fresh air itself can bear most of the indoor cooling and humidity load under the second operating condition, and the overall operating load of the fan coil unit is lower. Through the optimal adjustment of the fresh air water valve, the optimal ratio of the natural cooling capacity of the fresh air and the mechanical cooling capacity can be further matched to maximize the energy-saving potential of the low enthalpy fresh air and reduce the total power consumption of the system.

[0066] Using the above methods, this embodiment optimizes the terminal load distribution by locking the baseline fresh air volume and then optimizing the water valve for the first operating condition with high outdoor enthalpy. For the second operating condition with low outdoor enthalpy, it further matches the optimal ratio of natural cooling and mechanical cooling based on the free natural cooling capacity of the fresh air. Both operating conditions define a safe optimization range through a pre-defined boundary, and the fan coil unit adaptively follows to ensure indoor steady state, providing effective data for global power consumption optimization and achieving a synergistic improvement in indoor comfort and system energy efficiency under different outdoor conditions.

[0067] S304: When the adjustment strategy is the second adjustment strategy, the operating frequency of the fresh air unit is gradually reduced according to the second preset step size until the indoor environment is not in a stable state, at which point the adjustment of the operating frequency of the fresh air unit is stopped.

[0068] S305: After stopping the adjustment of the fresh air unit's operating frequency, gradually reduce the opening of the fresh air and water valve according to the third preset step size until any stopping condition is met, and stop adjusting the opening of the fresh air and water valve.

[0069] Regarding steps S304 and S305 above, the second preset step size refers to the fixed frequency change used in each step of the gradual reduction of the fresh air unit's operating frequency, for example, a decrease of 5Hz each time. The third preset step size refers to the fixed opening change used in each step of the gradual reduction of the fresh air / water valve opening, for example, a decrease of 5% each time.

[0070] An unstable indoor environment can be understood as the indoor temperature not reaching the preset temperature, the indoor humidity not reaching the preset humidity, or the indoor carbon dioxide concentration exceeding the preset concentration threshold.

[0071] The stopping condition is the same as the stopping condition corresponding to the first adjustment strategy, as described above. This embodiment will not repeat the details here.

[0072] Specifically, when determining to adopt the second adjustment strategy, the second adjustment strategy is implemented in the following two stages.

[0073] First, starting from the current operating frequency of the fresh air unit, the operating frequency is gradually reduced according to the second preset step size. After each step of frequency reduction, the system waits for the air conditioning system to stabilize. During this process, the fan coil unit adaptively adjusts its operating frequency and the opening of the coil water valve according to real-time changes in indoor temperature and humidity to maintain the indoor temperature and humidity within their respective preset threshold ranges. When the fresh air unit reduces the amount of fresh air introduced due to the reduced frequency, the outdoor moisture load brought by the fresh air decreases accordingly, and the fan coil unit adjusts its output accordingly to maintain the stability of the indoor environment.

[0074] After each frequency adjustment step is completed and the air conditioning system is running stably, check whether the indoor environment is still stable. If the indoor environment is still stable, record the total system power consumption corresponding to that adjustment step, which is the sum of the power of the fresh air unit, the power of the fan coil unit, and the power of the cooling source equipment, and continue to execute the next step of frequency reduction; if the indoor environment is not stable, stop further reducing the operating frequency of the fresh air unit, and lock the operating frequency corresponding to the step with the lowest total system power consumption in the previous steps. The fresh air volume corresponding to this frequency is the economical fresh air volume that meets the carbon dioxide requirements.

[0075] Then, after locking the operating frequency of the fresh air unit, maintain this frequency and gradually reduce the opening of the fresh air water valve according to the third preset step size. After each step of reducing the opening, wait for the air conditioning system to stabilize. During this process, the fan coil unit continues to adaptively adjust its operating frequency and the opening of the coil water valve according to real-time changes in indoor temperature and humidity to maintain the indoor temperature and humidity within their respective preset threshold ranges. When the reduced cooling capacity on the fresh air unit side due to the reduced water valve causes a gap in the indoor load, the fan coil unit automatically increases its output to fill the gap, ensuring a continuously stable indoor environment.

[0076] Continue performing the above-described operation of gradually reducing the opening of the fresh air and water valve until any of the above-mentioned stopping conditions are met, then stop the adjustment and the optimization process ends.

[0077] Through the above methods, this embodiment adopts a second adjustment strategy when the fresh air is humid in the second operating condition. It first gradually reduces the operating frequency to lock the economic fresh air volume, and then gradually reduces the water valve opening to optimize. This achieves orderly step-by-step adjustment by first reducing the dehumidification burden and then transferring the cooling load. Under the premise of ensuring the stability of the indoor environment, it provides stable operating data under multiple sets of different parameter combinations for subsequent power consumption optimization.

[0078] S306: When the adjustment strategy is the third adjustment strategy, the operating frequency of the fresh air unit is gradually increased according to the fourth preset step size until the indoor environment is not in a stable state, at which point the adjustment of the operating frequency of the fresh air unit is stopped.

[0079] S307: After stopping the adjustment of the operating frequency of the fresh air unit, gradually reduce the opening of the fresh air and water valve according to the fifth preset step size until any stopping condition is met, and stop adjusting the opening of the fresh air and water valve.

[0080] Regarding steps S306 and S307 above, the fourth preset step size refers to the fixed frequency change used in each step of the adjustment during the gradual increase of the fresh air unit's operating frequency, for example, increasing by 5Hz each time.

[0081] The fifth preset step size refers to the fixed change in opening size used in each step of the adjustment during the gradual reduction of the opening size of the fresh air valve, for example, a reduction of 5% each time.

[0082] The stopping conditions can be referred to the above description, and will not be repeated here in this embodiment.

[0083] Specifically, when determining to adopt the third adjustment strategy, the third adjustment strategy is implemented in the following two stages.

[0084] First, starting from the current operating frequency of the fresh air unit, the operating frequency is gradually increased according to the fourth preset step size. After each step of frequency increase, the system is allowed to stabilize. During this process, the fan coil unit adaptively adjusts its operating frequency and the opening of the coil water valve according to real-time changes in indoor temperature and humidity to maintain the indoor temperature and humidity within their respective preset threshold ranges. When the fresh air unit increases the amount of fresh air introduced due to the increased frequency, the natural cooling capacity and drying characteristics of the slightly drier outdoor fresh air are fully utilized to help bear part of the indoor heat and humidity load, and the fan coil unit adjusts its output accordingly to maintain the stability of the indoor environment.

[0085] After each frequency adjustment step is completed and the air conditioning system is running stably, check whether the indoor environment is still stable. If the indoor environment is still stable, record the total system power consumption corresponding to that adjustment step, which is the sum of the power of the fresh air unit, the power of the fan coil unit, and the power of the cooling source equipment, and continue to execute the next step of increasing the frequency; if the indoor environment is not stable, immediately stop increasing the operating frequency of the fresh air unit, and lock the operating frequency corresponding to the step with the lowest total system power consumption in the previous steps. The fresh air volume corresponding to this operating frequency is the economic fresh air volume.

[0086] Then, after locking the operating frequency of the fresh air unit, maintain this frequency and gradually reduce the opening of the fresh air water valve according to the fifth preset step size. After each step of reducing the opening, wait for the air conditioning system to stabilize. During this process, the fan coil unit continues to adaptively adjust its operating frequency and the opening of the coil water valve according to real-time changes in indoor temperature and humidity to maintain the indoor temperature and humidity within their respective preset threshold ranges. When the reduced cooling capacity on the fresh air unit side due to the reduced water valve causes a gap in the indoor load, the fan coil unit automatically increases its output to fill the gap, ensuring a continuously stable indoor environment.

[0087] Continue performing the above-described operation of gradually reducing the opening of the fresh air and water valve until any stopping condition is met, at which point the adjustment is stopped and the optimization process terminates.

[0088] Through the above methods, this embodiment adopts a third adjustment strategy when the fresh air is relatively dry in the second operating condition. First, the operating frequency is gradually increased to utilize the natural cold source of the dry outdoor fresh air and lock the economical fresh air volume. Then, the opening of the fresh air water valve is gradually reduced to optimize the process. This achieves orderly step-by-step adjustment by first making full use of the natural cold air volume and then transferring the cooling load. Under the premise of ensuring the stability of the indoor environment, it provides stable operating data under multiple sets of different parameter combinations for subsequent power consumption optimization.

[0089] S308: During the adjustment process, the fan coil units in the air conditioning system are controlled to maintain a stable indoor environment.

[0090] In this embodiment, the control method of the fan coil unit in step S308 is the same as that in step S203 above, and will not be described again here.

[0091] S309: During the adjustment process, determine the total system power consumption of the air conditioning system after each adjustment step.

[0092] S310: After the adjustment strategy is executed, the fresh air unit and / or fresh air and water valve are controlled based on the parameter information of the adjustment object corresponding to the system with the minimum total power consumption among all systems.

[0093] Regarding steps S309 and S310 above, when the adjustment strategy is the first adjustment strategy, the final determined adjustment object is the opening degree of the fresh air valve, that is, the opening degree corresponding to the minimum total power consumption of the system in each step. The operating frequency of the fresh air unit remains unchanged.

[0094] When the adjustment strategy is the second adjustment strategy, the final adjustment objects are the operating frequency of the fresh air unit and the opening degree of the fresh air and water valve, that is, the combination of the operating frequency corresponding to the minimum total power consumption of the system in each step of the first stage and the opening degree corresponding to the minimum total power consumption of the system in each step of the second stage.

[0095] When the adjustment strategy is the third adjustment strategy, the final adjustment objects are the operating frequency of the fresh air unit and the opening degree of the fresh air and water valve, that is, the combination of the operating frequency corresponding to the minimum total power consumption of the system in each step of the first stage and the opening degree corresponding to the minimum total power consumption of the system in each step of the second stage.

[0096] In this embodiment, after executing step S310, the air conditioning system control method provided in this embodiment further includes the following steps: Record the mapping relationship between the target operating condition and the adjustment object corresponding to the minimum total system power consumption, and return to the execution step of determining the target operating condition of the air conditioning system when the indoor environment of the air conditioning system is in a stable state; After obtaining the target operating condition, the mapping relationship is queried using the target operating condition; If the mapping relationship does not record the adjustment object corresponding to the minimum total system power consumption that matches the target operating condition, execute the step of determining the corresponding adjustment strategy for the air conditioning system based on the target operating condition.

[0097] The mapping relationship can be understood as establishing a one-to-one correspondence between the target operating condition and the parameter values ​​of the adjustment object corresponding to the minimum total system power consumption under that operating condition. For example, the correspondence between the first operating condition and the optimal fresh air valve opening, and the correspondence between a certain humidity condition under the second operating condition and the optimal operating frequency and optimal opening are stored together.

[0098] Specifically, after determining the optimal control parameters through power consumption optimization under the current target operating conditions and controlling the operation of the air conditioning system accordingly, the results of this optimization are stored to form a mapping relationship.

[0099] After completing the recording of the mapping relationship, return to the step of determining the target operating condition. After obtaining the target operating condition again, do not immediately execute the step of determining the adjustment strategy based on the target operating condition. Instead, first use the current target operating condition to query the recorded mapping relationship to determine whether there is a record in the mapping relationship that matches the current target operating condition.

[0100] If a mapping relationship matching the current target operating condition is found, it means that this operating condition has undergone a complete step-by-step adjustment and power consumption optimization process in historical operation, and the optimal control parameters that minimize the total power consumption of the system have been found. At this time, the optimal control parameters can be directly called from the mapping relationship to control the fresh air unit and / or fresh air and water valve, without having to perform the step-by-step adjustment steps again. Thus, the repeated trial and error in the optimization process is skipped, and the system directly operates under the historically verified optimal parameter combination.

[0101] If the mapping relationship does not record a minimum total system power consumption matching the current target operating condition, it indicates that the current operating condition is appearing for the first time or has not yet been optimized. In this case, continue to execute the step of determining the adjustment strategy corresponding to the air conditioning system based on the target operating condition, adjust the adjustment object step by step according to the adjustment strategy, complete the power consumption optimization, and after the control is executed, supplement the optimization result to the mapping relationship for use in subsequent similar operating conditions.

[0102] It should be noted that the mapping relationships mentioned above are stored in Figure 1 The data storage module 5 in the air conditioning system shown.

[0103] In this embodiment, the mapping relationship between the target operating condition and the optimal control parameters is recorded after each optimization is completed. In subsequent identical operating conditions, the stored parameters are directly called to skip the step-by-step adjustment process, thereby realizing the accumulation and reuse of historical optimal operating parameters and avoiding the extra time and energy consumption caused by repeated optimization.

[0104] This embodiment provides a control method for an air conditioning system. First, the indoor environment is brought to a stable state. Then, a corresponding adjustment strategy is determined based on the target operating conditions. At least one of the operating frequency of the fresh air unit and the opening degree of the fresh air / water valve is adjusted step by step. During the adjustment process, the fan coil unit is controlled to maintain indoor environmental stability. Finally, based on the total system power consumption after each adjustment step, the adjustment parameter corresponding to the minimum total system power consumption is selected to control the fresh air unit and / or the fresh air / water valve. This decouples multiple previously mutually coupled adjustment parameters into independent adjustment dimensions that can be optimized step-by-step according to the target operating conditions. This breaks the limitation of existing technologies that can only achieve localized stable operation of a single device, realizing global collaborative optimization control with the goal of minimizing the total power consumption of the air conditioning system. This reduces the total power consumption of the air conditioning system while ensuring indoor environmental stability, meeting higher energy-saving requirements.

[0105] To facilitate understanding of the technical solution of this application, the main flow of the control method for the air conditioning system provided in this application will be described in detail below with reference to Figure 4, as follows: After the air conditioning system is started, it first operates using an equal-state air supply logic to keep the indoor carbon dioxide level stable below 1000ppm, and the indoor temperature and humidity meet the indoor design requirements.

[0106] The ambient temperature and humidity of the indoor environment and the ambient temperature and humidity of the outdoor environment are obtained, so as to determine the indoor air enthalpy value based on the indoor ambient temperature and humidity, and the outdoor air enthalpy value based on the outdoor ambient temperature and humidity.

[0107] First operating condition: The outdoor air enthalpy is much greater than the indoor state point enthalpy, and the indoor air enthalpy is greater than the preset air enthalpy (design air supply point 0-point enthalpy).

[0108] When the outdoor air enthalpy is much greater than the indoor state point enthalpy and the indoor air enthalpy is greater than the preset air enthalpy, it is confirmed that the fresh air condition is poor. Increasing the fresh air supply will only increase the total power consumption of the air conditioning system. The first adjustment strategy is executed, and single-dimensional extreme value search control is carried out. The specific steps are as follows: Remove the constraint of the constant setpoint for the fresh air supply temperature, no longer using a fixed outlet air temperature as the control target, and release the active adjustment authority of the fresh air and water valve. Adjust the opening of the fresh air and water valve to 100% full to conduct an initial test.

[0109] Real-time monitoring of indoor temperature and humidity. If the indoor temperature and humidity are lower than the set target value and remain below the threshold for an extended period when fully open, it indicates that the cooling and dehumidification capacity of the fresh air side is excessive. At this point, the fresh air water valve is gradually closed, and the valve opening degree that just maintains a stable indoor environment is recorded through the data storage module. This is determined as the target opening degree boundary of the fresh air water valve, defining the effective range for formal optimization.

[0110] Starting from the target opening boundary, the opening of the fresh air and water valve is gradually reduced in 5% increments. As the fresh air and water valve closes, the outlet air temperature of the fresh air unit gradually increases, and the cooling capacity borne by the fresh air unit decreases accordingly. The heat and humidity load originally borne by the fresh air unit is gradually transferred to the fan coil unit side. The fan coil unit side adaptively follows the adjustment according to the equal-state air supply control logic. The outlet air temperature of the fan coil unit and the water valve of the fan coil unit are automatically matched and adjusted according to the load changes. After each adjustment reaches a steady state, the corresponding parameter information and the total system power are recorded in the data storage module.

[0111] During the adjustment process, the adjustment cycle will exit if any of the following stopping conditions are met: the fresh air unit water valve has been closed to the minimum opening; or the fan coil unit's operating frequency and the coil water valve have been adjusted to the maximum, and the fan coil unit can no longer bear the load transferred by the fresh air unit.

[0112] By comparing the total system power (fresh air unit power + fan coil unit power + cooling source equipment power) of each steady-state operating condition in the data storage module, the operating combination with the lowest total system power is selected, and the parameter information of the adjustment object under the current optimal operating condition is recorded.

[0113] Second operating condition: Outdoor air enthalpy is less than or equal to the preset air enthalpy and indoor air enthalpy is greater than the preset air enthalpy (design air supply point 0-point enthalpy). When the outdoor air enthalpy is less than or equal to the preset air enthalpy and the indoor air enthalpy is greater than the preset air enthalpy, the system is designated as the second operating condition. The core of this condition is to maximize the use of free outdoor cooling capacity and prioritize the use of low-enthalpy, dry outdoor air to reduce the overall energy consumption of the system. This condition also adopts the first adjustment strategy. The processes of initial adjustment and locking of fresh air volume, determination of target opening boundary, adaptive following adjustment on the fan coil side, steady-state determination and convergence stop, and data storage and locking operation are completely consistent with the first operating condition. The operating balance point with the lowest total system power consumption is found through single-dimensional optimization of the fresh air and water valve.

[0114] Third operating condition: Indoor air enthalpy is greater than outdoor air enthalpy, and outdoor air enthalpy is greater than the preset air enthalpy. When the indoor air enthalpy is greater than the outdoor air enthalpy and the outdoor air enthalpy is greater than the preset air enthalpy, it is determined to be the third operating condition. This operating condition introduces a preset moisture content threshold (M-point moisture content, under rated operating conditions the system is selected for equal air supply, under design operating conditions the dehumidification power consumption per unit air volume of the fresh air unit is much greater than that of the fan coil unit; as the outdoor temperature and humidity decrease, the moisture content decreases, there is a critical point that makes the dehumidification energy consumption per unit air volume of the two equal, this point is M-point) as the core criterion, and matches the corresponding adjustment strategy with two sub-operating conditions to execute extreme value search control.

[0115] Sub-condition 1: Fresh air humidity > preset humidity threshold (fresh air is slightly humid) After the air conditioning system is adjusted to a stable indoor environment through equal-state air supply control, the operating frequency of the fresh air unit is gradually reduced in 5Hz increments. Simultaneously, the total system power consumption is compared between the fresh air unit power, fan coil unit power, and cold source equipment operating conditions to meet the requirements of a stable indoor environment. Adjustment stops when the indoor carbon dioxide concentration fails to meet the requirements or the indoor temperature and humidity exceed the design value within the threshold time. The operating combination with the lowest total system power consumption is determined, and the operating frequency of the fresh air unit is locked at this time. The operating frequency of the fresh air unit will not be adjusted again afterward.

[0116] After the operating frequency of the fresh air unit is locked, the process of initial testing of the fresh air unit water valve, determination of the target opening boundary, step adjustment, adaptive following adjustment on the fan coil side, steady-state judgment and convergence stop, data storage and locking operation are all consistent with the fresh air water valve optimization process in the first working condition.

[0117] Sub-condition 2: Fresh air moisture content ≤ preset moisture content threshold (fresh air is slightly dry) After the air conditioning system is adjusted to a stable indoor environment through the equal-state air supply control, the operating frequency of the fresh air unit is gradually increased in increments of 5Hz (which can be adjusted as needed) until the indoor carbon dioxide concentration fails to meet the requirements, or the indoor temperature and humidity exceed the design value within the threshold time, at which point the adjustment stops. The total system power consumption is compared with the power of the fresh air unit, the power of the fan coil unit, and the operating conditions of the cold source equipment under the requirements of a stable indoor environment. The operating combination with the lowest total system power consumption is determined, and the corresponding operating frequency of the fresh air unit is locked, and no further adjustments are made.

[0118] After the operating frequency of the fresh air unit is locked, the process of initial testing of the fresh air unit water valve, determination of the target opening boundary, step adjustment, adaptive following adjustment on the fan coil side, steady-state judgment and convergence stop, data storage and locking operation are all consistent with the fresh air water valve optimization process in the first working condition.

[0119] The optimal operating parameters for all operating conditions are recorded in the data storage module, establishing a mapping relationship between target operating conditions and optimal adjustment parameters. The target operating condition of the air conditioning system is continuously monitored. Upon obtaining a new target operating condition, the stored mapping relationship is first queried using that target operating condition. If the mapping relationship does not record the optimal adjustment parameter that matches the target working condition, the corresponding adjustment strategy is executed to complete the optimization, and the new mapping relationship is added and stored. If a matching record already exists in the mapping relationship, the corresponding parameters can be directly called to control the device operation without repeating the optimization process.

[0120] As the system runs longer, the accumulated operating data becomes richer, and there are more scenarios where the optimal parameters can be directly reused. This saves the extra energy consumption of repeated optimization and continuously improves the overall energy-saving effect of the system.

[0121] refer to Figure 5 , Figure 5 This is a schematic diagram of the structure of a control device for an air conditioning system provided in an embodiment of this application. The control device for a heat pump system provided in this application includes a determination module and a control module. The determination module 10 is used to determine the target operating condition of the air conditioning system when the indoor environment of the air conditioning system is in a stable state; the determination module 10 is also used to determine an adjustment strategy corresponding to the air conditioning system based on the target operating condition, the adjustment strategy indicating a step-by-step adjustment of the adjustment object in the air conditioning system, the adjustment object including at least one of the following: the operating frequency of the fresh air unit in the air conditioning system and the opening degree of the fresh air and water valve of the fresh air unit; the control module 20 is used to execute the adjustment strategy to step-by-step adjust the adjustment object, and during the adjustment process, control the fan coil unit in the air conditioning system to maintain the indoor environment in a stable state; the determination module 10 is also used to determine the total system power consumption of the air conditioning system after each adjustment step during the adjustment process; the control module 20 is also used to control the fresh air unit and / or the fresh air and water valve based on the parameter information of the adjustment object corresponding to the minimum total system power consumption among the various total system power consumptions after the execution of the adjustment strategy.

[0122] In this embodiment, when the target operating condition is a first operating condition or a second operating condition, the adjustment strategy is a first adjustment strategy. The first operating condition indicates that the outdoor air enthalpy value corresponding to the outdoor environment where the air conditioning system is located is greater than the indoor air enthalpy value corresponding to the indoor environment and the indoor air enthalpy value corresponding to the indoor environment is greater than a preset air enthalpy value. The second operating condition indicates that the outdoor air enthalpy value corresponding to the outdoor environment where the air conditioning system is located is less than or equal to the preset air enthalpy value and the indoor air enthalpy value corresponding to the indoor environment is greater than the preset air enthalpy value. The control module 20 is further configured to: When the adjustment strategy is the first adjustment strategy, the operating frequency of the fresh air unit is kept constant and the opening of the fresh air-water valve is controlled to the maximum opening. The opening of the fresh air-water valve is then gradually reduced according to a first preset step size until any of the following stopping conditions are met, at which point the adjustment of the opening of the fresh air-water valve is stopped: The opening degree of the new air and water valve reaches the minimum opening degree; The adjustment capability of the fan coil unit reaches the preset capability threshold.

[0123] In this embodiment, the control module 20 is further configured to: Starting from the maximum opening of the new air-water valve, the opening of the new air-water valve is controlled to decrease in order to determine the target opening boundary of the new air-water valve that keeps the indoor environment in a stable state. Starting from the target opening boundary, the step of gradually reducing the opening of the new air valve according to the first preset step size is executed.

[0124] In this embodiment, the determining module 10 is further configured to: When the target operating condition is the third operating condition, the air humidity corresponding to the outdoor environment of the air conditioning system is obtained. The third operating condition indicates that the indoor air enthalpy value corresponding to the indoor environment is greater than the outdoor air enthalpy value corresponding to the outdoor environment where the air conditioning system is located, and the outdoor air enthalpy value is greater than the preset air enthalpy value. Determine the comparison result between the air humidity content and the preset humidity threshold; Based on the comparison results, the corresponding adjustment strategy for the air conditioning system is determined.

[0125] In this embodiment, the determining module 10 is further configured to: When the comparison result indicates that the air humidity content is greater than the preset humidity content threshold, the adjustment strategy corresponding to the air conditioning system is determined to be the second adjustment strategy.

[0126] In this embodiment, the control module 20 is further configured to: When the adjustment strategy is the second adjustment strategy, the operating frequency of the fresh air unit is gradually reduced according to the second preset step size until the indoor environment is not in a stable state and the adjustment of the operating frequency of the fresh air unit is stopped. After stopping the adjustment of the operating frequency of the fresh air unit, control the opening of the fresh air water valve to the maximum opening, and gradually reduce the opening of the fresh air water valve according to the third preset step size until any of the following stopping conditions are met, and stop adjusting the opening of the fresh air water valve: The opening degree of the new air and water valve reaches the minimum opening degree; The adjustment capability of the fan coil unit reaches the preset capability threshold.

[0127] In this embodiment, the determining module 10 is further configured to: When the comparison result indicates that the air humidity content is less than or equal to the preset humidity content threshold, the adjustment strategy corresponding to the air conditioning system is determined to be the third adjustment strategy.

[0128] In this embodiment, the control module 20 is further configured to: When the adjustment strategy is the third adjustment strategy, the operating frequency of the fresh air unit is gradually increased according to the fourth preset step size until the indoor environment is not in a stable state and the adjustment of the operating frequency of the fresh air unit is stopped. After stopping the adjustment of the operating frequency of the fresh air unit, control the opening of the fresh air water valve to the maximum opening, and gradually reduce the opening of the fresh air water valve according to the fifth preset step size until any of the following stopping conditions are met, and stop adjusting the opening of the fresh air water valve: The opening degree of the new air and water valve reaches the minimum opening degree; The adjustment capability of the fan coil unit reaches the preset capability threshold.

[0129] In this embodiment, the stable state of the indoor environment can be determined in the following way: After the air conditioning system is started, the opening of the fan coil water valve is controlled so that the outlet air temperature of the fan coil reaches the first preset supply air temperature, and the operating frequency of the fan coil is controlled so that the ambient temperature of the indoor environment reaches the preset temperature threshold and the ambient humidity of the indoor environment reaches the preset humidity threshold. The opening degree of the fresh air and water valve of the fresh air unit is controlled so that the outlet air temperature of the fresh air unit reaches the second preset supply air temperature, and the operating frequency of the fresh air unit is controlled so that the carbon dioxide concentration in the indoor environment is less than a preset concentration threshold. When the ambient temperature reaches the preset temperature threshold, the ambient humidity reaches the preset humidity threshold, and the carbon dioxide concentration in the indoor environment is less than the preset concentration threshold, the indoor environment is determined to be in a stable state.

[0130] In this embodiment, the determining module 10 is further configured to: Record the mapping relationship between the target operating condition and the parameter information of the adjustment object corresponding to the minimum total power consumption of the system, and return to execute the step of determining the target operating condition of the air conditioning system when the indoor environment of the air conditioning system is in a stable state.

[0131] In this embodiment, the control module 20 is further configured to: After obtaining the target operating condition, the mapping relationship is queried using the target operating condition; If the mapping relationship does not record the adjustment object corresponding to the minimum total system power consumption that matches the target operating condition, the step of determining the adjustment strategy corresponding to the air conditioning system based on the target operating condition is executed.

[0132] This embodiment provides a control device for an air conditioning system. First, the indoor environment is brought to a stable state. Then, based on the target operating conditions, a corresponding adjustment strategy is determined. At least one of the operating frequency of the fresh air unit and the opening degree of the fresh air / water valve is gradually adjusted. During the adjustment process, the fan coil unit is controlled to maintain indoor environmental stability. Finally, based on the total system power consumption after each adjustment step, the adjustment parameter corresponding to the minimum total system power consumption is selected to control the fresh air unit and / or the fresh air / water valve. This decouples multiple previously mutually coupled adjustment parameters into independent adjustment dimensions that can be optimized step-by-step according to the target operating conditions. This breaks the limitation of existing technologies that can only achieve localized stable operation of a single device, realizing global collaborative optimization control with the goal of minimizing the total power consumption of the air conditioning system. This reduces the total power consumption of the air conditioning system while ensuring indoor environmental stability, meeting higher energy-saving requirements.

[0133] Figure 6 This is a schematic diagram of the structure of an air conditioning system provided in an embodiment of this application. Figure 6 The air conditioning system 600 shown is an energy-saving air conditioning system, which includes: at least one processor 601, a memory 602, at least one network interface 604, and other user interfaces 603. The various components in the air conditioning system 600 are coupled together via a bus system 605. It is understood that the bus system 605 is used to realize the connection and communication between these components. In addition to a data bus, the bus system 605 also includes a power bus, a control bus, and a status signal bus. However, for clarity, ... Figure 6 The general designated all buses as Bus System 605.

[0134] The user interface 603 may include a display, keyboard, or clicking device (e.g., mouse, trackball, touchpad, or touchscreen).

[0135] It is understood that the memory 602 in this embodiment of the invention can be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. The non-volatile memory can be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. The volatile memory can be random access memory (RAM), which is used as an external cache. By way of example, but not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced Synchronous DRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), and Direct Rambus RAM (DRRAM). The memory 602 described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0136] In some implementations, memory 602 stores elements, executable units or data structures, or subsets thereof, or extended sets thereof: operating system 6021 and application program 6022.

[0137] The operating system 6021 includes various system programs, such as the framework layer, core library layer, and driver layer, used to implement various basic business functions and handle hardware-based tasks. The application program 6022 includes various applications, such as a media player and a browser, used to implement various application functions. The program implementing the method of this embodiment can be included in the application program 6022.

[0138] In this embodiment of the invention, the processor 601 executes the method steps provided in each method embodiment by calling the program or instructions stored in the memory 602, specifically the program or instructions stored in the application program 6022.

[0139] The methods disclosed in the above embodiments of the present invention can be applied to processor 601, or implemented by processor 601. Processor 601 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method can be completed by the integrated logic circuit of the hardware in processor 601 or by instructions in the form of software. The processor 601 may be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of the present invention. The general-purpose processor may be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of the present invention can be directly embodied in the execution of a hardware decoding processor, or executed by a combination of hardware and software units in the decoding processor. The software units may be located in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. The storage medium is located in memory 602. Processor 601 reads the information in memory 602 and, in conjunction with its hardware, completes the steps of the above method.

[0140] It is understood that the embodiments described herein can be implemented in hardware, software, firmware, middleware, microcode, or a combination thereof. For hardware implementation, the processing unit can be implemented in one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field-programmable gate arrays (FPGAs), general-purpose processors, controllers, microcontrollers, microprocessors, other electronic units for performing the functions described herein, or combinations thereof.

[0141] For software implementation, the techniques described herein can be implemented by units that perform the functions described herein. The software code can be stored in memory and executed by a processor. The memory can be implemented in the processor or external to the processor.

[0142] The air conditioning system provided in this embodiment can be as follows: Figure 6 The air conditioning system shown can perform the following functions: Figure 2 ~All steps of the control method for the air conditioning system in Figure 4 are shown, thereby achieving Figure 2 The technical effects of the control method for the air conditioning system shown in Figure 4 can be found in the following reference: Figure 2 The description in Figure 4 is for succinct purposes and will not be elaborated upon here.

[0143] This invention also provides a storage medium (computer-readable storage medium). This storage medium stores one or more programs. The storage medium may include volatile memory, such as random access memory; it may also include non-volatile memory, such as read-only memory, flash memory, hard disk, or solid-state drive; and it may also include combinations of the above types of memory.

[0144] When one or more programs in the storage medium can be executed by one or more processors to implement the air conditioning system control method described above, which is executed on the control device side of the air conditioning system.

[0145] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0146] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein can be implemented in hardware, a software module executed by a processor, or a combination of both. The software module can be located in random access memory (RAM), main memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.

[0147] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A control method for an air conditioning system, characterized in that, include: Under the condition that the indoor environment of the air conditioning system is in a stable state, the target operating condition of the air conditioning system is determined. Based on the target operating conditions, a corresponding adjustment strategy for the air conditioning system is determined. The adjustment strategy indicates that the adjustment objects in the air conditioning system are adjusted step by step. The adjustment objects include at least one of the following: the operating frequency of the fresh air unit in the air conditioning system and the opening degree of the fresh air water valve of the fresh air unit. The adjustment strategy is executed to gradually adjust the object to be adjusted, and during the adjustment process, the fan coil units in the air conditioning system are controlled to maintain the indoor environment in a stable state. During the adjustment process, the total system power consumption of the air conditioning system after each adjustment step is determined; After the adjustment strategy is executed, the fresh air fan and / or the fresh air valve are controlled based on the parameter information of the adjustment object corresponding to the system with the minimum total power consumption among all the system total power consumption.

2. The method according to claim 1, characterized in that, When the target operating condition is the first operating condition or the target operating condition is the second operating condition, the adjustment strategy is the first adjustment strategy. The first operating condition indicates that the outdoor air enthalpy value corresponding to the outdoor environment where the air conditioning system is located is greater than the indoor air enthalpy value corresponding to the indoor environment and the indoor air enthalpy value corresponding to the indoor environment is greater than the preset air enthalpy value. The second operating condition indicates that the outdoor air enthalpy value corresponding to the outdoor environment where the air conditioning system is located is less than or equal to the preset air enthalpy value and the indoor air enthalpy value corresponding to the indoor environment is greater than the preset air enthalpy value. The execution of the adjustment strategy to gradually adjust the adjustment object includes: When the adjustment strategy is the first adjustment strategy, the operating frequency of the fresh air unit is kept constant and the opening of the fresh air-water valve is controlled to the maximum opening. The opening of the fresh air-water valve is then gradually reduced according to a first preset step size until any of the following stopping conditions are met, at which point the adjustment of the opening of the fresh air-water valve is stopped: The opening degree of the new air and water valve reaches the minimum opening degree; The adjustment capability of the fan coil unit reaches the preset capability threshold.

3. The method according to claim 2, characterized in that, Before performing the step of gradually reducing the opening of the new air valve according to the first preset step size, the method further includes: Starting from the maximum opening of the new air-water valve, the opening of the new air-water valve is controlled to decrease in order to determine the target opening boundary of the new air-water valve that keeps the indoor environment in a stable state. Starting from the target opening boundary, the step of gradually reducing the opening of the new air valve according to the first preset step size is executed.

4. The method according to claim 1, characterized in that, The step of determining the adjustment strategy corresponding to the air conditioning system based on the target operating condition includes: When the target operating condition is the third operating condition, the air humidity corresponding to the outdoor environment of the air conditioning system is obtained. The third operating condition indicates that the indoor air enthalpy value corresponding to the indoor environment is greater than the outdoor air enthalpy value corresponding to the outdoor environment where the air conditioning system is located, and the outdoor air enthalpy value is greater than the preset air enthalpy value. Determine the comparison result between the air humidity content and the preset humidity threshold; Based on the comparison results, the corresponding adjustment strategy for the air conditioning system is determined.

5. The method according to claim 4, characterized in that, The step of determining the adjustment strategy corresponding to the air conditioning system based on the comparison result includes: When the comparison result indicates that the air humidity content is greater than the preset humidity content threshold, the adjustment strategy corresponding to the air conditioning system is determined to be the second adjustment strategy. The execution of the adjustment strategy to gradually adjust the adjustment object includes: When the adjustment strategy is the second adjustment strategy, the operating frequency of the fresh air unit is gradually reduced according to the second preset step size until the indoor environment is not in a stable state and the adjustment of the operating frequency of the fresh air unit is stopped. After stopping the adjustment of the operating frequency of the fresh air unit, control the opening of the fresh air water valve to the maximum opening, and gradually reduce the opening of the fresh air water valve according to the third preset step size until any of the following stopping conditions are met, and stop adjusting the opening of the fresh air water valve: The opening degree of the new air and water valve reaches the minimum opening degree; The adjustment capability of the fan coil unit reaches the preset capability threshold.

6. The method according to claim 4, characterized in that, The step of determining the adjustment strategy corresponding to the air conditioning system based on the comparison result includes: When the comparison result is that the air humidity is less than or equal to the preset humidity threshold, the adjustment strategy corresponding to the air conditioning system is determined to be the third adjustment strategy. The execution of the adjustment strategy to gradually adjust the adjustment object includes: When the adjustment strategy is the third adjustment strategy, the operating frequency of the fresh air unit is gradually increased according to the fourth preset step size until the indoor environment is not in a stable state and the adjustment of the operating frequency of the fresh air unit is stopped. After stopping the adjustment of the operating frequency of the fresh air unit, control the opening of the fresh air water valve to the maximum opening, and gradually reduce the opening of the fresh air water valve according to the fifth preset step size until any of the following stopping conditions are met, and stop adjusting the opening of the fresh air water valve: The opening degree of the new air and water valve reaches the minimum opening degree; The adjustment capability of the fan coil unit reaches the preset capability threshold.

7. The method according to claim 1, characterized in that, The stability of the indoor environment can be determined in the following ways: After the air conditioning system is started, the opening of the fan coil water valve is controlled so that the outlet air temperature of the fan coil reaches the first preset supply air temperature, and the operating frequency of the fan coil is controlled so that the ambient temperature of the indoor environment reaches the preset temperature threshold and the ambient humidity of the indoor environment reaches the preset humidity threshold. The opening degree of the fresh air and water valve of the fresh air unit is controlled so that the outlet air temperature of the fresh air unit reaches the second preset supply air temperature, and the operating frequency of the fresh air unit is controlled so that the carbon dioxide concentration in the indoor environment is less than a preset concentration threshold. When the ambient temperature reaches the preset temperature threshold, the ambient humidity reaches the preset humidity threshold, and the carbon dioxide concentration in the indoor environment is less than the preset concentration threshold, the indoor environment is determined to be in a stable state.

8. The method according to claim 1, characterized in that, After performing the step of controlling the fresh air unit and / or the fresh air / water valve, the method further includes: Record the mapping relationship between the target operating condition and the parameter information of the adjustment object corresponding to the minimum total power consumption of the system, and return to execute the step of determining the target operating condition of the air conditioning system when the indoor environment of the air conditioning system is in a stable state; After obtaining the target operating condition, the mapping relationship is queried using the target operating condition; If the mapping relationship does not record the adjustment object corresponding to the minimum total system power consumption that matches the target operating condition, the step of determining the adjustment strategy corresponding to the air conditioning system based on the target operating condition is executed.

9. A control device for an air conditioning system, characterized in that, include: The determination module is used to determine the target operating condition of the air conditioning system when the indoor environment of the air conditioning system is in a stable state. The determining module is further configured to determine the adjustment strategy corresponding to the air conditioning system based on the target operating condition. The adjustment strategy indicates that the adjustment objects in the air conditioning system are adjusted step by step. The adjustment objects include at least one of the following: the operating frequency of the fresh air unit in the air conditioning system and the opening degree of the fresh air water valve of the fresh air unit. The control module is used to execute the adjustment strategy to gradually adjust the adjustment object, and during the adjustment process, control the fan coil unit in the air conditioning system to maintain the indoor environment in a stable state. The determining module is also used to determine the total system power consumption of the air conditioning system after each adjustment step during the adjustment process. The control module is further configured to, after completing the execution of the adjustment strategy, control the fresh air unit and / or the fresh air valve based on the parameter information of the adjustment object corresponding to the system with the minimum total power consumption among the various systems.

10. An air conditioning system, characterized in that, include: Processor and memory; The processor is used to execute the control program of the air conditioning system stored in the memory to implement the control method of the air conditioning system according to any one of claims 1 to 8.

11. A storage medium, characterized in that, The storage medium stores one or more programs, which can be executed by one or more processors to implement the control method of the air conditioning system according to any one of claims 1 to 8.

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