Water source multi-connected unit control method and device, water source multi-connected unit and storage medium

Abstract

The application relates to a water source multi-connected unit control method and device, a water source multi-connected unit and a storage medium, and comprises the following steps: acquiring multi-dimensional operation parameters of a water source multi-connected unit, wherein the multi-dimensional operation parameters comprise pipeline state parameters of a plate heat exchanger and internal pressure parameters of the unit; according to the multi-dimensional operation parameters and a target frost crack risk assessment strategy, the frost crack risk grade of the plate heat exchanger is determined; and according to the frost crack risk grade, a corresponding indoor unit regulation strategy is executed to dynamically adjust the operation load of the water source multi-connected unit. According to the application, the frost crack risk of the heat exchanger is comprehensively determined by using multi-dimensional operation parameters, and a hierarchical indoor unit load regulation mode is adopted to actively inhibit the icing risk, which is different from the traditional passive anti-freezing scheme of single water temperature detection and whole unit shutdown, can effectively reduce the frost crack failure probability of the plate heat exchanger, and improves the operation stability of the water source multi-connected unit under a low-temperature working condition.

Description

Technical Field

[0001] This application relates to the field of water source multi-split unit technology, and in particular to a water source multi-split unit control method, device, water source multi-split unit and storage medium. Background Technology

[0002] Water source multi-split air conditioning units rely on the outdoor unit's water circuit and refrigerant for heat exchange to achieve cooling and heating operation. In low-temperature environments and during the unit's heating operation, the water temperature in the circuit can easily drop continuously. When the water temperature falls below the freezing point, the water inside the plate heat exchanger freezes, which can easily cause pipe cracking and refrigerant leakage. This failure will directly interrupt the unit's operation, and in severe cases, render the entire unit unusable, resulting in high maintenance and equipment replacement costs.

[0003] Existing antifreeze solutions for plate heat exchangers mostly employ passive protection logic, setting only a single minimum water temperature threshold. Once triggered, the entire unit shuts down immediately, leading to frequent unit shutdowns that severely reduce operational stability and system energy efficiency. Furthermore, traditional antifreeze strategies have rigid control logic, making them unsuitable for complex operating conditions such as high and low temperatures and fluctuations in load across multiple indoor units, thus failing to balance user comfort with heat exchanger antifreeze safety. Summary of the Invention

[0004] Therefore, it is necessary to provide a control method, device, water source multi-split unit, and storage medium for water source multi-split units that can actively reduce the risk of heat exchanger icing while taking into account both unit operation safety and indoor comfort, in order to address the above-mentioned technical problems.

[0005] In a first aspect, this application provides a control method for a multi-unit water source generating system, including:

[0006] The multi-dimensional operating parameters of the water source multi-unit are obtained, wherein the multi-dimensional operating parameters include the pipeline status parameters of the plate heat exchanger and the internal pressure parameters of the unit;

[0007] Based on the multidimensional operating parameters and the target freeze-cracking risk assessment strategy, the freeze-cracking risk level of the plate heat exchanger is determined;

[0008] The corresponding indoor unit control strategy is executed according to the freezing and cracking risk level to dynamically adjust the operating load of the water source multi-unit.

[0009] In one embodiment, the multidimensional operating parameters include refrigerant inlet temperature, refrigerant outlet temperature, water inlet temperature, water outlet temperature, and saturation temperature corresponding to the suction pressure.

[0010] The step of determining the freeze-cracking risk level of the plate heat exchanger based on the multi-dimensional operating parameters and the target freeze-cracking risk assessment strategy includes:

[0011] Obtain parameter thresholds corresponding to different freezing and cracking risk levels; the parameter thresholds include refrigerant temperature threshold, water pipe temperature threshold, inlet and outlet water temperature difference threshold, and saturation temperature threshold;

[0012] The multidimensional operating parameters are compared with the corresponding parameter thresholds. If the multidimensional operating parameters meet the parameter conditions corresponding to any risk level, the freezing crack risk level of the plate heat exchanger is determined as the corresponding risk level.

[0013] In one embodiment, the method further includes:

[0014] A virtual digital twin model of the plate heat exchanger is constructed, and the internal heat exchange state of the plate heat exchanger under different environmental parameters is simulated in real time; the environmental parameters include ambient temperature and ambient humidity.

[0015] Based on the internal heat exchange state of the plate heat exchanger under different environmental parameters, the parameter thresholds corresponding to different freeze-cracking risk levels are determined.

[0016] In one embodiment, after executing the corresponding indoor unit control strategy according to the freezing crack risk level to dynamically adjust the operating load of the water source multi-unit, the method further includes:

[0017] The multi-dimensional operating parameters of the plate heat exchanger are continuously monitored, and the freezing risk level of the plate heat exchanger is determined based on the multi-dimensional operating parameters and the target freezing risk assessment strategy.

[0018] If the risk level of freezing and cracking of the plate heat exchanger decreases, the water source multi-unit shall be controlled to return to normal operation.

[0019] If the freezing risk level of the plate heat exchanger remains unchanged and the duration exceeds the preset duration threshold, or if the freezing risk level of the plate heat exchanger increases, the water source multi-unit will be shut down and a maintenance alarm strategy will be implemented.

[0020] In one embodiment, the frost cracking risk level includes a first risk level, a second risk level, and a third risk level; the first risk level is lower than the second risk level, and the second risk level is lower than the third risk level;

[0021] The step of determining the freeze-cracking risk level of the plate heat exchanger based on the multi-dimensional operating parameters and the target freeze-cracking risk assessment strategy includes:

[0022] If the refrigerant outlet temperature is less than or equal to the first refrigerant temperature threshold, the refrigerant inlet temperature is greater than or equal to the second refrigerant temperature threshold, the water inlet temperature is less than or equal to the first water pipe temperature threshold, the water outlet temperature is greater than or equal to the second water pipe temperature threshold, the water inlet and outlet temperature difference is less than or equal to the first inlet and outlet temperature difference threshold and greater than or equal to the second inlet and outlet temperature difference threshold, or the saturation temperature corresponding to the suction pressure is less than or equal to the first saturation temperature threshold and greater than or equal to the second saturation temperature threshold, the plate heat exchanger is determined to be at the first risk level of freezing.

[0023] If the refrigerant outlet temperature is less than the second refrigerant temperature threshold, the refrigerant inlet temperature is greater than or equal to the third refrigerant temperature threshold, the water inlet temperature is less than the second water pipe temperature threshold, the water outlet temperature is greater than or equal to the third water pipe temperature threshold, the water inlet and outlet temperature difference is less than the second inlet and outlet temperature difference threshold and greater than or equal to the third inlet and outlet temperature difference threshold, or the saturation temperature corresponding to the suction pressure is less than the second saturation temperature threshold and greater than or equal to the third saturation temperature threshold, the freezing crack risk level of the plate heat exchanger is determined to be the second risk level.

[0024] The plate heat exchanger is classified as having a third risk level of freezing and cracking when the refrigerant outlet temperature is less than the third refrigerant temperature threshold, the refrigerant inlet temperature is less than the third refrigerant temperature threshold, the water inlet temperature is less than the third water pipe temperature threshold, the water outlet temperature is less than the third water pipe temperature threshold, the water inlet-outlet temperature difference is less than the third inlet-outlet temperature difference threshold, or the saturation temperature corresponding to the suction pressure is less than the third saturation temperature threshold. Specifically, the first refrigerant temperature threshold is greater than the second refrigerant temperature threshold, the second refrigerant temperature threshold is greater than the third refrigerant temperature threshold, the first water pipe temperature threshold is greater than the second water pipe temperature threshold, the second water pipe temperature threshold is greater than the third water pipe temperature threshold, the first inlet-outlet temperature difference threshold is less than the second inlet-outlet temperature difference threshold, the second inlet-outlet temperature difference threshold is less than the third inlet-outlet temperature difference threshold, the first saturation temperature threshold is greater than the second saturation temperature threshold, and the second saturation temperature threshold is greater than the third saturation temperature threshold.

[0025] In one embodiment, the method further includes:

[0026] If the duration of the water source multi-unit in the second risk level is greater than the first duration threshold, or the frequency of the water source multi-unit entering the second risk level is greater than the first frequency threshold, the parameter threshold corresponding to the first risk level is adjusted so that the water source multi-unit can enter the second risk level more quickly.

[0027] If the duration of the water source multi-unit in the third risk level is greater than the second duration threshold, or the frequency of the water source multi-unit entering the third risk level is greater than the second frequency threshold, the parameter threshold corresponding to the second risk level is adjusted so that the water source multi-unit can enter the third risk level more quickly; the second duration threshold is less than the first duration threshold, and the second frequency threshold is less than the first frequency threshold.

[0028] In one embodiment, the step of executing the corresponding indoor unit control strategy based on the freezing crack risk level to dynamically adjust the operating load of the water source multi-unit includes:

[0029] If the freezing and cracking risk level is the first risk level, the target cooling capacity of the water source multi-split unit is reduced by a first value according to the first control strategy, and the target temperature of the indoor unit is reset based on the reduced cooling capacity.

[0030] If the freezing risk level is the second risk level, the target cooling capacity of the water source multi-split unit is reduced by a second value according to the second control strategy, and the target temperature of the indoor unit is reset based on the reduced cooling capacity; the second value is greater than the first value.

[0031] If the risk level of freezing cracking is the third risk level, control part or all of the internal machines to shut down in accordance with the third control strategy.

[0032] In one embodiment, the water source multi-unit includes a first indoor unit and a second indoor unit; the method further includes:

[0033] If the freezing risk level is the first risk level, the first indoor unit is controlled according to the first control strategy until the first indoor unit resets the target temperature.

[0034] If the risk level of freezing and cracking is the second risk level, the first indoor unit and the second indoor unit are controlled according to the second control strategy until both the first indoor unit and the second indoor unit reset the target temperature.

[0035] Secondly, this application also provides a control device for a multi-unit water source generator, used to execute the control method for the multi-unit water source generator described in the first aspect, the device comprising:

[0036] The acquisition module is used to acquire multi-dimensional operating parameters of the water source multi-unit, wherein the multi-dimensional operating parameters include the pipeline status parameters of the plate heat exchanger and the internal pressure parameters of the unit;

[0037] The determination module is used to determine the freezing risk level of the plate heat exchanger based on the multidimensional operating parameters and the target freezing risk assessment strategy.

[0038] The control module is used to execute the corresponding indoor unit control strategy according to the freezing and cracking risk level, so as to dynamically adjust the operating load of the water source multi-unit.

[0039] Thirdly, this application also provides a water source multi-split unit, including: a data acquisition component, a cooling component, and a control component; the control component is respectively connected to the data acquisition component and the cooling component;

[0040] The data acquisition component is used to acquire multi-dimensional operating parameters of the water source multi-unit, wherein the multi-dimensional operating parameters include the pipeline status parameters of the plate heat exchanger and the internal pressure parameters of the unit;

[0041] The refrigeration component is used to achieve the refrigeration function;

[0042] The control component is used to control the refrigeration component according to the control method of the water source multi-unit as described in the first aspect.

[0043] Fourthly, this application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the control method for the water source multi-unit described in the first aspect.

[0044] In summary, this application proposes a control method, device, water source multi-split unit, and storage medium for a water source multi-split unit, comprising: acquiring multi-dimensional operating parameters of the water source multi-split unit, wherein the multi-dimensional operating parameters include pipe state parameters of the plate heat exchanger and internal pressure parameters of the unit; determining the freezing risk level of the plate heat exchanger based on the multi-dimensional operating parameters and a target freezing risk assessment strategy; and executing a corresponding indoor unit control strategy based on the freezing risk level to dynamically adjust the operating load of the water source multi-split unit. This application comprehensively determines the freezing risk of the heat exchanger through multi-dimensional operating parameters and actively suppresses the freezing risk by adopting a graded indoor unit load control method. This differs from the traditional passive anti-freezing scheme of single water temperature detection and complete unit shutdown, effectively reducing the probability of plate heat exchanger freezing failure and improving the operational stability of the water source multi-split unit under low-temperature conditions. Attached Figure Description

[0045] Figure 1 This is a system structure block diagram of a water source multi-unit in one embodiment;

[0046] Figure 2 This is a system structure diagram of a water source multi-unit in one embodiment;

[0047] Figure 3 This is a flowchart illustrating the control method for a multi-unit water source control system in one embodiment;

[0048] Figure 4 This is a flowchart illustrating the steps for determining the risk level of frost cracking in one embodiment.

[0049] Figure 5 This is a flowchart illustrating the control method for a multi-unit water source in another embodiment;

[0050] Figure 6 This is a structural block diagram of the control device for a multi-unit water source generator set in one embodiment;

[0051] Figure 7 This is an internal structural diagram of a computer device in one embodiment.

[0052] Summary of attached image labels:

[0053] Data acquisition component-110, first water temperature sensing unit-111, second water temperature sensing unit-112, first refrigerant temperature sensing unit-113, second refrigerant temperature sensing unit-114, compressor suction pressure sensing unit-115, refrigeration component-120, variable frequency compressor-121, plate heat exchanger-122, four-way valve-123, subcooler-124, oil separator-125, gas-liquid separator-126, control component-130 Detailed Implementation

[0054] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0055] The control method for multi-unit water source generators provided in this application can be applied to... Figure 1 The hardware system of the multi-split water source unit shown is illustrated. The multi-split water source unit provided in this embodiment is as follows: Figure 1 As shown, it includes a data acquisition component 110, a cooling component 120, and a control component 130.

[0056] The data acquisition component 110 includes a refrigerant temperature sensing unit, a water temperature sensing unit, and a compressor suction pressure sensing unit 115, which are respectively arranged in the refrigerant inlet and outlet pipes, the water inlet and outlet pipes, and the compressor suction side of the plate heat exchanger 122, for real-time acquisition of multi-dimensional operating parameters of the unit.

[0057] The refrigeration assembly 120 includes multiple indoor units, a variable frequency compressor 121, a plate heat exchanger 122, a four-way valve 123, a subcooler 124, an oil separator 125, a gas-liquid separator 126, and gas and liquid pipes connecting the indoor and outdoor units. All components are connected via gas, liquid, and water pipes to form a complete refrigerant heat exchange loop and water circulation loop, working together to complete the unit's heating and cooling heat exchange functions. The indoor unit, as the terminal heat exchange device of the refrigeration assembly 120, is responsible for heat exchange on the indoor side. For example, the connection relationship of the components of the refrigeration assembly 120 can be as follows: Figure 2 As shown. The components of the cooling assembly 120 can be configured according to the needs of the actual application scenario.

[0058] like Figure 2 As shown, the water temperature sensing unit includes a second water temperature sensing unit 111 and a second water temperature sensing unit 112. The second water temperature sensing unit 111 is arranged on the inlet side of the water inlet and outlet pipes of the plate heat exchanger 122 to collect the water inlet temperature, and the second water temperature sensing unit 112 is arranged on the outlet side of the water inlet and outlet pipes of the plate heat exchanger 122 to collect the water outlet temperature. The refrigerant temperature sensing unit includes a first refrigerant temperature sensing unit 113 and a second refrigerant temperature sensing unit 114. The first refrigerant temperature sensing unit 113 is arranged at the inlet of the refrigerant inlet and outlet pipes to collect the refrigerant inlet temperature, and the second refrigerant temperature sensing unit 114 is arranged at the outlet of the refrigerant inlet and outlet pipes to collect the refrigerant outlet temperature. The compressor suction pressure sensing unit 115 is arranged on the compressor suction side to collect the compressor suction pressure. It should be noted that the actual device types of the refrigerant temperature sensing unit, water circuit temperature sensing unit, and compressor suction pressure sensing unit 115 can be determined according to the needs of the actual application scenario. For example, temperature sensing packages, temperature sensors, pressure sensors, and other devices can be used to achieve the corresponding data acquisition functions. After receiving the compressor suction pressure collected by the compressor suction pressure sensing unit 115, the control component 130 will determine the saturation temperature corresponding to the suction pressure based on the correspondence between the compressor suction pressure and the saturation temperature of the refrigerant. In a specific embodiment, the refrigerant saturation temperature corresponding to the suction pressure can also be understood as the evaporation temperature, and the specific value depends on the type of refrigerant and the current absolute suction pressure.

[0059] The control component 130 is the main controller, with a built-in memory and processor. The memory stores the antifreeze control program provided in the embodiments of this application. The processor can call and execute the program, read the operating parameters uploaded by the data acquisition component 110, and output control commands to adjust the operating state of the refrigeration component 120, thereby realizing the antifreeze control logic of the plate heat exchanger 122.

[0060] In one embodiment, such as Figure 3 As shown, a control method for a multi-unit water source generator is provided, which is applied to... Figure 1 Taking the control component in the example, the following steps are included:

[0061] S301, Obtain multi-dimensional operating parameters of the water source multi-unit. These multi-dimensional operating parameters include the piping status parameters of the plate heat exchanger and the internal pressure parameters of the unit.

[0062] In this embodiment, the multidimensional operating parameters are divided into two main categories: the pipe condition parameters of the plate heat exchanger and the internal pressure parameters of the unit. Specifically, the pipe condition parameters of the plate heat exchanger in this embodiment include the refrigerant inlet temperature, refrigerant outlet temperature, water inlet temperature, and water outlet temperature, which are used to characterize the refrigerant heat exchange conditions and water heat exchange conditions of the heat exchanger. The internal pressure parameters of the unit in this embodiment include the suction pressure. This embodiment determines the saturation temperature corresponding to the suction pressure by using a preset mapping model between suction pressure and saturation temperature. The saturation temperature corresponding to the suction pressure characterizes the degree of matching between the heat exchange capacity of the evaporator and the cooling load of the system. In some embodiments, the suction superheat can also be combined to jointly evaluate the heat exchange adequacy and liquid supply status of the system. Suction superheat refers to the difference between the suction temperature and the suction pressure saturation temperature.

[0063] In practical applications, refrigerant temperature sensing units and water temperature sensing units are deployed on the refrigerant inlet and outlet pipes, water inlet and outlet pipes of the plate heat exchanger, and suction pressure sensing units are deployed on the suction side of the compressor to simultaneously and continuously measure all multi-dimensional operating parameters. The controller establishes real-time communication with each sensing unit, continuously collecting real-time operating data from the refrigerant side, water side, and compressor suction side of the heat exchanger, summarizing and generating a complete set of multi-dimensional operating parameters, and pushing the parameter set to the processor's computing unit cache in real time, providing raw data for subsequent freeze-cracking risk assessment and differentiated indoor unit control.

[0064] Based on the above steps, this embodiment collects multi-dimensional operating parameters of the water source multi-unit to fully restore the actual heat exchange conditions of the unit from multiple dimensions. This avoids the risks of missed or misjudged detection caused by single parameter detection and can reduce the probability of plate heat exchanger pipe freezing cracks, refrigerant leaks and other faults from the source.

[0065] S302, based on multi-dimensional operating parameters and target freeze-cracking risk assessment strategy, determine the freeze-cracking risk level of plate heat exchangers.

[0066] In this embodiment, the target freezing risk assessment strategy is a standardized judgment logic system pre-stored in the controller's memory, including multi-dimensional parallel threshold comparison rules and gradient risk classification logic. Specifically, the target freezing risk assessment strategy provided in this embodiment configures independent gradient thresholds for the saturation temperature corresponding to refrigerant temperature, water circuit temperature, inlet and outlet water temperature difference, and suction pressure. When any parameter reaches the corresponding interval threshold, the corresponding risk judgment is triggered to determine the freezing risk level.

[0067] After retrieving the target freeze-cracking risk assessment strategy from local storage, the processor compares the real-time collected multi-dimensional operating parameters with the parameter thresholds corresponding to each level of risk within the strategy, comprehensively matching the severity of icing hazards corresponding to the current unit heat exchange conditions, and outputting a unique corresponding freeze-cracking risk level. It should be noted that the target freeze-cracking risk assessment strategy provided in this embodiment does not require all parameters to be simultaneously abnormal before identifying a risk, which can effectively improve the sensitivity of risk detection.

[0068] In this embodiment, the number of classification levels for the freezing risk of the plate heat exchanger can be configured according to the needs of actual application. For example, the freezing risk can be divided into three levels, with the risk level increasing progressively. The first risk level is low freezing risk, representing a slight drop in water temperature and a minor insufficiency in heat exchange, with only a slight risk of icing. The second risk level is medium freezing risk, representing a faster rate of water temperature drop and a significant decrease in heat exchange efficiency, with a significantly increased risk of freezing. The third risk level is high freezing risk, representing near-failure of water heat exchange, with the water temperature rapidly approaching the freezing point, making it extremely prone to pipe freezing and refrigerant leakage.

[0069] In some embodiments, the number of classification levels for the risk of freezing cracks can be set to three or more, and an internal control strategy corresponding to the level can be matched to achieve more refined multi-level control and better balance the comfort and reliability of the system.

[0070] S303 implements corresponding indoor unit control strategies based on the level of frost cracking risk to dynamically adjust the operating load of the water source multi-unit.

[0071] In this embodiment, differentiated indoor unit control commands are issued for different risk levels. By reducing the target cooling capacity of the unit, resetting the target temperature of the indoor unit, and shutting down some indoor units, the heat exchange load of the whole unit can be reduced, which can effectively slow down the rate of water temperature drop and prevent the plate heat exchanger from freezing.

[0072] Specifically, the indoor unit control strategy is a gradient load adjustment scheme matched with each level of frost cracking risk; the higher the risk level, the greater the load reduction of the unit. This embodiment, by setting a gradient adjustment indoor unit control strategy, takes into account both frost protection safety and indoor heating comfort, abandoning the traditional passive protection mode of directly shutting down the entire unit.

[0073] In practical applications, taking the risk level of freezing and cracking as divided into low-risk, medium-risk, and high-risk levels as an example: If the risk level of freezing and cracking is determined to be low-risk, the controller implements a mild control strategy, slightly reducing the target cooling capacity of the unit, resetting the target temperature of the ordinary indoor units based on the reduced load value, while the VIP core indoor units maintain their original heating load output, only slightly reducing the total heat exchange load of the system, and slowly slowing down the cooling rate of the water circuit. If the risk level of freezing and cracking is determined to be medium-risk, the controller implements a moderate control strategy, significantly reducing the target cooling capacity of the unit, simultaneously resetting the target temperature of all indoor units, reducing the overall heat exchange load of the unit, and suppressing the continuous and rapid drop in water temperature. If the risk level of freezing and cracking is determined to be high-risk, a severe control strategy is implemented, directly shutting down all or most of the ordinary indoor units, leaving only a small number of VIP indoor units running at low load, minimizing the overall heat exchange consumption of the unit, blocking the continuous cooling of the water circuit from the heat exchange source, and preventing the internal pipes of the plate heat exchanger from freezing and cracking.

[0074] Based on the above steps, the overall operating load is dynamically reduced through graded differentiated indoor unit control, which gently suppresses the downward trend of water temperature in the water circuit and achieves proactive antifreeze protection for the plate heat exchanger.

[0075] In summary, this embodiment provides a control method for a multi-unit water source generator set. It comprehensively determines the risk of freezing and cracking based on multi-dimensional operating parameters, and replaces the traditional whole-unit shutdown protection with graded indoor unit load regulation. Under the premise of ensuring the antifreeze safety of heat exchangers, it reduces the frequency of unit shutdowns and improves the stability of operation under low-temperature conditions.

[0076] In one embodiment, such as Figure 4 As shown, based on multi-dimensional operating parameters and the target freeze-cracking risk assessment strategy, the freeze-cracking risk level of the plate heat exchanger is determined, including:

[0077] S401, obtain the parameter thresholds corresponding to different freezing and cracking risk levels. The parameter thresholds include refrigerant temperature threshold, water pipe temperature threshold, inlet and outlet water temperature difference threshold, and saturation temperature threshold.

[0078] In this embodiment, the entire set of parameter thresholds is divided into four major categories based on monitoring dimensions: refrigerant temperature threshold, water pipe temperature threshold, inlet / outlet water temperature difference threshold, and saturation temperature threshold. The refrigerant temperature threshold includes graded threshold values ​​for the temperatures of the refrigerant inlet and outlet pipes. The water pipe temperature threshold includes graded threshold values ​​for the temperatures of the water pipe inlet and outlet pipes. The inlet / outlet water temperature difference threshold characterizes changes in water circuit heat exchange efficiency and is a graded threshold value for the difference between the water pipe inlet and outlet temperatures. The saturation temperature threshold is the temperature threshold value corresponding to the saturation temperature at the suction pressure. Each threshold category has a gradient numerical range set according to low, medium, and high freezing and cracking risks. The threshold ranges corresponding to different risk levels are mutually distinguishable and clearly hierarchical, providing a quantitative standard for subsequent parameter comparison and judgment.

[0079] S402 compares the multidimensional operating parameters with the corresponding parameter thresholds. If the multidimensional operating parameters meet the parameter conditions corresponding to any risk level, the freezing crack risk level of the plate heat exchanger is determined as the corresponding risk level.

[0080] In this embodiment, multi-dimensional operating parameters, such as the refrigerant inlet temperature, refrigerant outlet temperature, water inlet temperature, water outlet temperature, and saturation temperature corresponding to the suction pressure, are collected in real time and compared one by one with the parameter thresholds corresponding to each level of risk in the same dimension. Specifically, this embodiment adopts a parallel judgment rule that determines risk based on any trigger in any dimension, without requiring all parameters to reach the abnormal range simultaneously before identifying risk.

[0081] If any of the operating parameters, such as refrigerant temperature, water pipe temperature, inlet and outlet water temperature difference, or suction pressure, falls within the threshold range corresponding to a certain risk level and meets the preset parameter conditions for that level, then the current plate heat exchanger's freeze-cracking risk level is directly determined to be the corresponding risk level.

[0082] Based on the above steps, this embodiment can simultaneously capture heat exchange anomalies in any dimension of the refrigerant side, water circuit side, and compressor side through multi-dimensional parallel comparison logic, identify the icing risk caused by a single parameter anomaly in advance, effectively reduce the probability of missed or false judgment of freezing crack risk, and improve the timeliness and accuracy of risk identification.

[0083] In a specific embodiment, the risk level of freezing cracking includes a first risk level, a second risk level, and a third risk level; the first risk level is lower than the second risk level, and the second risk level is lower than the third risk level.

[0084] Based on multidimensional operating parameters and the target freeze-cracking risk assessment strategy, the freeze-cracking risk level of the plate heat exchanger is determined, including:

[0085] If the refrigerant outlet temperature is less than or equal to the first refrigerant temperature threshold, the refrigerant inlet temperature is greater than or equal to the second refrigerant temperature threshold, the water inlet temperature is less than or equal to the first water pipe temperature threshold, the water outlet temperature is greater than or equal to the second water pipe temperature threshold, the water inlet and outlet temperature difference is less than or equal to the first inlet and outlet temperature difference threshold and greater than or equal to the second inlet and outlet temperature difference threshold, or the saturation temperature corresponding to the suction pressure is less than or equal to the first saturation temperature threshold and greater than or equal to the second saturation temperature threshold, the plate heat exchanger is determined to be at the first risk level of freezing.

[0086] If the refrigerant outlet temperature is less than the second refrigerant temperature threshold, the refrigerant inlet temperature is greater than or equal to the third refrigerant temperature threshold, the water inlet temperature is less than the second water pipe temperature threshold, the water outlet temperature is greater than or equal to the third water pipe temperature threshold, the water inlet and outlet temperature difference is less than the second inlet and outlet temperature difference threshold and greater than or equal to the third inlet and outlet temperature difference threshold, or the saturation temperature corresponding to the suction pressure is less than the second saturation temperature threshold and greater than or equal to the third saturation temperature threshold, the plate heat exchanger is determined to be at the second risk level.

[0087] The plate heat exchanger is classified as having a third risk level of freezing and cracking if the refrigerant outlet temperature is less than the third refrigerant temperature threshold, the refrigerant inlet temperature is less than the third refrigerant temperature threshold, the water inlet temperature is less than the third water pipe temperature threshold, the water outlet temperature is less than the third water pipe temperature threshold, the water inlet-outlet temperature difference is less than the third water inlet-outlet temperature difference threshold, or the saturation temperature corresponding to the suction pressure is less than the third saturation temperature threshold. Specifically, the first refrigerant temperature threshold is greater than the second refrigerant temperature threshold, the second refrigerant temperature threshold is greater than the third refrigerant temperature threshold, the first water pipe temperature threshold is greater than the second water pipe temperature threshold, the second water pipe temperature threshold is greater than the third water pipe temperature threshold, the first water inlet-outlet temperature difference threshold is less than the second water inlet-outlet temperature difference threshold, the second water inlet-outlet temperature difference threshold is less than the third water inlet-outlet temperature difference threshold, the first saturation temperature threshold is greater than the second saturation temperature threshold, and the second saturation temperature threshold is greater than the third saturation temperature threshold.

[0088] In this embodiment, the judgment logic corresponding to the four major threshold systems can be summarized into the following cases according to the gradient assessment strategy corresponding to different frost cracking risk levels:

[0089] In the first scenario, the risk level of frost cracking is determined to be the first risk level if any of the following conditions are met: or , or , , .

[0090] In the second scenario, the risk level of frost cracking is determined to be the second risk level if any of the following conditions are met: or , or , , .

[0091] In the third scenario, the risk level of frost cracking is determined to be the third risk level if any of the following conditions are met: or , or , .

[0092] in, Indicates the refrigerant inlet pipe temperature. Indicates the refrigerant outlet temperature. Indicates the water inlet temperature. Indicates the water temperature at the outlet of the water pipe. This indicates the temperature difference between the water entering and exiting the pipe, which is the difference between the water temperature entering the pipe and the water temperature exiting the pipe. This represents the saturation temperature corresponding to the inhalation pressure. , , These represent the first refrigerant temperature threshold, the second refrigerant temperature threshold, and the third refrigerant temperature threshold, respectively. , , These represent the temperature thresholds for the first water pipe, the second water pipe, and the third water pipe, respectively. , , These represent the first inlet and outlet water temperature difference threshold, the second inlet and outlet water temperature difference threshold, and the third inlet and outlet water temperature difference threshold, respectively. , , These represent the first saturation temperature threshold, the second saturation temperature threshold, and the third saturation temperature threshold, respectively.

[0093] In a specific embodiment, the threshold values ​​for each parameter can be as shown in Table 1 below:

[0094]

[0095] It should be noted that the specific values ​​above are only used to illustrate the relationship between the thresholds and are not intended to limit the actual values. The actual values ​​of each threshold parameter need to be configured according to the needs of the actual application scenario in order to reasonably adapt to the settings of each frost cracking risk level.

[0096] In a feasible embodiment, the value of each parameter threshold can also be adaptively adjusted according to the duration and frequency of occurrence of each freezing crack risk level. For example, if the number of times the water source multi-unit enters the medium or high risk is greater than the preset number threshold, or the duration of the water source multi-unit in the medium or high risk is greater than the preset duration threshold, the assessment threshold corresponding to each freezing crack risk level can be appropriately increased so that the water source multi-unit can enter the protection state more quickly.

[0097] In one embodiment, the control method for a multi-unit water source control system further includes:

[0098] If the duration of the water source multi-unit in the second risk level is greater than the first duration threshold, or if the frequency of the water source multi-unit entering the second risk level is greater than the first frequency threshold, the parameter threshold corresponding to the first risk level will be adjusted so that the water source multi-unit can enter the second risk level more quickly.

[0099] If the duration of the water source multi-unit in the third risk level is greater than the second duration threshold, or the frequency of the water source multi-unit entering the third risk level is greater than the second frequency threshold, the parameter thresholds corresponding to the second risk level shall be adjusted so that the water source multi-unit can enter the third risk level more quickly; the second duration threshold shall be less than the first duration threshold, and the second frequency threshold shall be less than the first frequency threshold.

[0100] In this embodiment, the controller continuously monitors the duration of each risk level and the frequency of risk triggering per unit time. If the unit repeatedly enters the second risk level or the single dwell time is too long, the first risk level judgment threshold is automatically raised, causing the unit to enter medium-risk protection earlier. If the unit frequently triggers the third risk level, or if the high risk level fails to decrease for an extended period, the second risk level judgment threshold is automatically raised, prompting the unit to enter high-risk shutdown protection earlier.

[0101] In this embodiment, the duration and frequency thresholds corresponding to high risk are set to be smaller, and the response priority for severe frost cracking risk is higher.

[0102] Based on the above steps, this embodiment can achieve threshold self-learning and self-adaptation without the need for manual on-site parameter modification, and can adapt to units in different regions and under different load conditions.

[0103] In one embodiment, the control method for a multi-unit water source control system further includes:

[0104] A virtual digital twin model of a plate heat exchanger is built, and the internal heat exchange state of the plate heat exchanger under different environmental parameters is simulated in real time; the environmental parameters include ambient temperature and ambient humidity.

[0105] Based on the internal heat exchange state of the plate heat exchanger under different environmental parameters, the parameter thresholds corresponding to different freeze-cracking risk levels are determined.

[0106] In this embodiment, by constructing a virtual digital twin model of the plate heat exchanger and synchronously importing real-time environmental parameters such as outdoor temperature and humidity, the internal temperature field and heat exchange efficiency variation trends of the heat exchanger can be simulated within the virtual model. Based on the simulated heat exchange results under different temperature and humidity environments, the threshold values ​​of refrigerant, water circuit, and suction pressure parameters corresponding to each level of risk are dynamically adjusted.

[0107] Based on the above steps, this embodiment can adaptively lower the protection threshold in application scenarios with high temperature and low humidity, and adaptively lower the protection threshold in application scenarios with low temperature and high humidity, so that the risk judgment standard can be adapted to the real-time external environment, further reducing the probability of false triggering of antifreeze.

[0108] In one embodiment, such as Figure 5 As shown, after implementing the corresponding indoor unit control strategy according to the freezing crack risk level to dynamically adjust the operating load of the water source multi-unit, the control method of the water source multi-unit also includes:

[0109] S501 continuously monitors the multi-dimensional operating parameters of the plate heat exchanger and determines the freezing risk level of the plate heat exchanger based on the multi-dimensional operating parameters and the target freezing risk assessment strategy.

[0110] In this embodiment, after the indoor unit graded control strategy in step S203 is executed, the controller drives each temperature and pressure sensing unit to continuously and periodically collect multi-dimensional operating parameters consisting of the refrigerant inlet pipe temperature, refrigerant outlet pipe temperature, water inlet temperature, water outlet temperature, and the saturation temperature corresponding to the suction pressure of the plate heat exchanger. It also continuously calls the pre-stored target freezing risk assessment strategy, compares the latest collected multi-dimensional operating parameters with the refrigerant temperature threshold, water pipe temperature threshold, inlet and outlet water temperature difference threshold, and saturation temperature threshold corresponding to each level of risk, updates the current freezing risk level of the plate heat exchanger in real time, and dynamically tracks the changing trend of heat exchange conditions and icing hazards, providing real-time judgment basis for subsequent unit recovery or shutdown alarms.

[0111] It should be noted that the specific methods for obtaining parameters and determining risk levels in step S501 can be found in the specific implementation methods of the relevant steps in the foregoing embodiments, and will not be elaborated here.

[0112] S502, if the risk level of freezing and cracking of the plate heat exchanger decreases, control the water source multi-unit to restore normal operation.

[0113] In this embodiment, when the real-time assessment of the freezing risk level decreases compared to the previous cycle, it indicates that the water temperature in the water circuit is rising, the heat exchange condition is improving, and the freezing risk is gradually being eliminated. At this time, the controller executes a step-by-step load recovery logic, gradually increasing the unit's target cooling capacity in fixed small increments, and simultaneously raising the target temperature of each indoor unit in stages. After each load increase, a stabilization buffer period is reserved. After the operating parameters such as the water circuit temperature and the saturation temperature corresponding to the suction pressure tend to stabilize, the next round of load recovery operation is executed until the unit returns to the normal operating conditions before the anti-freeze protection.

[0114] The step-by-step recovery method adopted in this embodiment can avoid a sudden and significant increase in the heat exchange load of the unit, which would cause a second rapid drop in the water temperature of the water circuit, prevent the risk of repeated freezing and cracking, and ensure the stable operation of the unit.

[0115] S503 If the freezing risk level of the plate heat exchanger remains unchanged and the duration exceeds the preset duration threshold, or if the freezing risk level of the plate heat exchanger increases, the water source multi-unit will be shut down and a maintenance alarm strategy will be implemented.

[0116] In this embodiment, the duration of the current freezing risk level is statistically analyzed in real time. On the one hand, if the risk level does not decrease for a long time, remains at the original high-risk state, and continues for a duration exceeding the preset duration threshold, it indicates that the existing indoor unit load control methods cannot effectively curb the water temperature drop, and the heat exchanger has a continuous risk of freezing. On the other hand, if the real-time determined freezing risk level increases compared to the previous cycle, it indicates that the water circuit heat exchange continues to deteriorate, and the risk of freezing is further aggravated.

[0117] When any of the above conditions are met, the controller issues a shutdown command for the entire unit, cutting off the heat exchange output of the compressor and indoor unit. Simultaneously, a maintenance alarm strategy is activated, pushing fault alarm information, current multi-dimensional operating parameters, and the duration of the risk to the user terminal and the equipment installation service provider's backend via the unit's built-in communication module. This alerts maintenance personnel to investigate the root causes of faults such as water circuit blockage, insufficient refrigerant charge, and heat exchanger heat exchange attenuation, proactively preventing equipment damage and economic losses caused by plate heat exchanger pipe freezing and refrigerant leakage.

[0118] In one embodiment, a corresponding indoor unit control strategy is executed based on the freezing crack risk level to dynamically adjust the operating load of the water source multi-unit, including:

[0119] If the risk level of freezing and cracking is the highest level, the target cooling capacity of the water source multi-split unit will be reduced by a first value according to the first control strategy, and the target temperature of the indoor unit will be reset based on the reduced cooling capacity.

[0120] If the risk level of freezing and cracking is the second risk level, the target cooling capacity of the water source multi-split unit will be reduced by a second value according to the second control strategy, and the target temperature of the indoor unit will be reset based on the reduced cooling capacity; the second value is greater than the first value.

[0121] If the risk level of freezing cracking is level three, control some or all of the internal machines by implementing the third control strategy.

[0122] The water source multi-unit includes a first indoor unit and a second indoor unit; if the risk level of freezing and cracking is the first risk level, the first indoor unit is controlled according to the first control strategy until the first indoor unit resets the target temperature.

[0123] If the risk level of freezing and cracking is the second risk level, control the first and second indoor units according to the second control strategy until both the first and second indoor units reset to the target temperature.

[0124] In this embodiment, the water source multi-split air conditioning system supports pre-setting identification for each indoor unit, classifying them into a first indoor unit and a second indoor unit. The first indoor unit refers to the ordinary indoor unit of the water source multi-split air conditioning unit, and the second indoor unit refers to the VIP core indoor unit of the water source multi-split air conditioning unit. In actual application scenarios, the two types of indoor units are clearly distinguished in terms of functional positioning, anti-freeze control priority, and load protection logic. Specifically, the VIP core indoor unit corresponds to key protection areas, with high requirements for temperature regulation comfort and no long-term cooling shutdown allowed. Ordinary indoor units correspond to secondary areas and can temporarily reduce their temperature regulation capacity or shut down for short periods. When the system performs anti-freeze load reduction, it prioritizes sacrificing the temperature regulation capacity of ordinary indoor units to maximize the output load of the VIP core indoor unit. Only when the risk of freezing and cracking escalates or the hidden danger intensifies will the temperature regulation capacity of the VIP core indoor unit be reduced simultaneously. In feasible embodiments, during high-risk phases, only all ordinary indoor units are shut down, while the VIP indoor units can maintain low-load continuous operation.

[0125] In this embodiment, when the risk level of freezing and cracking is the first risk level, the first control strategy is executed. The overall target cooling capacity of the water source multi-split unit is reduced by a first value, and the reduced overall cooling capacity is used as the load limit. Only the first indoor unit, which is a regular indoor unit, completes the target temperature reset, while the VIP core indoor unit maintains its original target temperature. Temperature adjustment commands are issued only to the first indoor unit until it completes the target temperature reset, while the second indoor unit maintains its original heating output without intervention. In this stage, only the temperature adjustment load of secondary areas is slightly reduced, the total heat exchange consumption of the whole unit is slightly reduced, and the cooling rate of the plate heat exchanger water circuit is slowly slowed down, so the temperature adjustment comfort of key rooms is not affected.

[0126] When the risk level of freezing and cracking is level two, the second control strategy is implemented. The overall target cooling capacity of the water source multi-split unit is reduced by a second value, where the second value is greater than the first value, and the load reduction is significantly greater than that of the first control strategy. Based on the reduced overall cooling capacity, the target temperature of the VIP core indoor unit and the ordinary indoor units is simultaneously reset. The controller simultaneously sends temperature adjustment commands to the first and second indoor units until both types of indoor units have completed the target temperature reset. During this stage, the temperature adjustment output of all indoor units is simultaneously reduced, significantly reducing the overall heat exchange load, suppressing the rapid drop in water temperature, and mitigating the risk of plate heat exchanger icing.

[0127] When the freezing risk level is level three, the third control strategy is implemented. At this point, the risk of heat exchanger freezing is deemed extremely high. Only the VIP core indoor unit is kept running at low load, while all or most of the ordinary indoor units are shut down directly. The refrigerant supply and fan operation of the corresponding indoor units are cut off to minimize overall heat exchange consumption and curb continuous cooling of the water circuit from the heat exchange source, preventing the plate heat exchanger pipes from freezing and cracking. Simultaneously, the unit sends out anti-freeze alarm information to remind users to pay attention to the risk of low-temperature freezing. It should be noted that the third control strategy can also shut down all first and second indoor units to ensure the safety of the plate heat exchanger.

[0128] In a feasible embodiment, the controller provided in this embodiment can also have a built-in thermodynamic model of the water system. The model is equipped with fixed equipment parameters such as the heat exchange area of ​​the plate heat exchanger, the diameter of the water pipe, the water flow rate, the specific heat capacity of the water side, and the heat transfer coefficient of the refrigerant. At the same time, it can import dynamic operating parameters such as the current refrigerant inlet and outlet pipe temperatures, the inlet and outlet water temperatures, the saturation temperature corresponding to the suction pressure, and the total load of the unit in real time. Based on the thermodynamic heat transfer equation, the controller can deduce the changes in the heat balance of the water system in real time, accurately predict the continuous change trend of the inlet and outlet water temperatures in the future, and anticipate the trend of the water temperature dropping rapidly and approaching the freezing point in advance, rather than passively triggering protection only after the water temperature reaches the threshold.

[0129] Furthermore, the controller locally stores the historical operating dataset of the entire unit's lifecycle. This dataset includes samples such as multi-dimensional operating parameters, risk trigger records, ambient temperature and humidity, and indoor unit load distribution records under low-temperature conditions over the years. Machine learning algorithms are used to train the historical dataset offline, constructing a freezing crack risk identification model. Through sample learning, the model distinguishes between normal low-temperature operating conditions and high-risk conditions with potential freezing hazards. It automatically captures parameter combination patterns that are prone to causing plate heat exchanger freezing cracks, enabling early risk identification. Freezing crack hazards can be predicted before heat exchange parameters reach the threshold range of the basic scheme, allowing for early initiation of light load adjustments and extending the risk intervention buffer period.

[0130] When a potential risk of freezing and cracking is identified and an indoor unit control command is issued, this embodiment employs a gradual load adjustment and tiered flexible shutdown mechanism to avoid unit operation fluctuations caused by sudden load changes. When reducing the target cooling capacity of the unit, the load is gradually reduced in multiple rounds with fixed small increments. After each round of adjustment, a stabilization buffer period is reserved until the saturation temperature parameters corresponding to the water circuit temperature and suction pressure stabilize before executing the next round of load reduction. If it is determined that indoor units need to be shut down, not all target indoor units are cut off at once. Instead, non-VIP indoor units are shut down in batches and at different times according to priority. A batch of ordinary indoor units is shut down at fixed intervals, prioritizing the continuous output heating capacity of VIP indoor units.

[0131] This embodiment uses a water circuit thermodynamic model to predict water temperature trends and machine learning to identify potential freezing and cracking risk patterns, upgrading antifreeze protection from post-triggered intervention to pre-emptive intervention. Combined with a gentle control logic of gradual adjustment and tiered flexible shutdown, it avoids drastic fluctuations in unit load, thus suppressing continuous water temperature decline earlier and reducing the probability of plate heat exchanger pipe freezing and cracking at the source. It also significantly reduces the comfort loss caused by sudden drops in indoor temperature, balancing unit antifreeze safety with indoor user experience, and improving the overall operational stability of the water source multi-split system in low-temperature environments.

[0132] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0133] Based on the same inventive concept, this application also provides a control device for a water source multi-unit system to implement the control method for the aforementioned water source multi-unit system. The solution provided by this device is similar to the solution described in the above method. Therefore, the specific limitations in the one or more water source multi-unit control device embodiments provided below can be found in the limitations of the control method for the water source multi-unit system described above, and will not be repeated here.

[0134] In one embodiment, such as Figure 6 As shown, a control device 600 for a multi-unit water source generator is provided, comprising: an acquisition module 610, a determination module 620, and a control module 630, wherein:

[0135] The acquisition module 610 is used to acquire multi-dimensional operating parameters of the water source multi-unit, including the pipeline status parameters of the plate heat exchanger and the internal pressure parameters of the unit.

[0136] The determination module 620 is used to determine the freeze-cracking risk level of the plate heat exchanger based on multi-dimensional operating parameters and the target freeze-cracking risk assessment strategy.

[0137] The control module 630 is used to execute the corresponding indoor unit control strategy according to the freezing crack risk level, so as to dynamically adjust the operating load of the water source multi-unit.

[0138] In one embodiment, the determining module 620 is further configured to obtain parameter thresholds corresponding to different freezing and cracking risk levels; the parameter thresholds include refrigerant temperature threshold, water pipe temperature threshold, inlet and outlet water temperature difference threshold, and saturation temperature threshold;

[0139] By comparing the multidimensional operating parameters with the corresponding parameter thresholds, and if the multidimensional operating parameters meet the parameter conditions corresponding to any risk level, the freezing crack risk level of the plate heat exchanger is determined as the corresponding risk level.

[0140] In one embodiment, the determining module 620 is also used to build a virtual digital twin model of the plate heat exchanger and simulate the internal heat exchange state of the plate heat exchanger under different environmental parameters in real time; the environmental parameters include ambient temperature and ambient humidity; based on the internal heat exchange state of the plate heat exchanger under different environmental parameters, the parameter thresholds corresponding to different freeze-cracking risk levels are determined.

[0141] In one embodiment, the control module 630 is also used to continuously monitor the multi-dimensional operating parameters of the plate heat exchanger, and determine the freezing risk level of the plate heat exchanger based on the multi-dimensional operating parameters and the target freezing risk assessment strategy; if the freezing risk level of the plate heat exchanger decreases, the water source multi-unit is controlled to return to normal operation; if the freezing risk level of the plate heat exchanger is maintained and the duration is greater than the preset duration threshold, or if the freezing risk level of the plate heat exchanger increases, the water source multi-unit is controlled to shut down and a maintenance alarm strategy is executed.

[0142] In one embodiment, the determining module 620 is further configured to determine the freezing crack risk level of the plate heat exchanger as the first risk level when the refrigerant outlet pipe temperature is less than or equal to the first refrigerant temperature threshold, the refrigerant inlet pipe temperature is greater than or equal to the second refrigerant temperature threshold, the water inlet pipe temperature is less than or equal to the first water pipe temperature threshold, the water outlet pipe temperature is greater than or equal to the second water pipe temperature threshold, the water inlet and outlet water temperature difference is less than or equal to the first inlet and outlet water temperature difference threshold and greater than or equal to the second inlet and outlet water temperature difference threshold, or the saturation temperature corresponding to the suction pressure is less than or equal to the first saturation temperature threshold and greater than or equal to the second saturation temperature threshold.

[0143] If the refrigerant outlet temperature is less than the second refrigerant temperature threshold, the refrigerant inlet temperature is greater than or equal to the third refrigerant temperature threshold, the water inlet temperature is less than the second water pipe temperature threshold, the water outlet temperature is greater than or equal to the third water pipe temperature threshold, the water inlet and outlet temperature difference is less than the second inlet and outlet temperature difference threshold and greater than or equal to the third inlet and outlet temperature difference threshold, or the saturation temperature corresponding to the suction pressure is less than the second saturation temperature threshold and greater than or equal to the third saturation temperature threshold, the plate heat exchanger is determined to be at the second risk level.

[0144] The plate heat exchanger is classified as having a third risk level of freezing and cracking if the refrigerant outlet temperature is less than the third refrigerant temperature threshold, the refrigerant inlet temperature is less than the third refrigerant temperature threshold, the water inlet temperature is less than the third water pipe temperature threshold, the water outlet temperature is less than the third water pipe temperature threshold, the water inlet-outlet temperature difference is less than the third water inlet-outlet temperature difference threshold, or the saturation temperature corresponding to the suction pressure is less than the third saturation temperature threshold. Specifically, the first refrigerant temperature threshold is greater than the second refrigerant temperature threshold, the second refrigerant temperature threshold is greater than the third refrigerant temperature threshold, the first water pipe temperature threshold is greater than the second water pipe temperature threshold, the second water pipe temperature threshold is greater than the third water pipe temperature threshold, the first water inlet-outlet temperature difference threshold is less than the second water inlet-outlet temperature difference threshold, the second water inlet-outlet temperature difference threshold is less than the third water inlet-outlet temperature difference threshold, the first saturation temperature threshold is greater than the second saturation temperature threshold, and the second saturation temperature threshold is greater than the third saturation temperature threshold.

[0145] In one embodiment, the control module 630 is further configured to adjust the parameter threshold corresponding to the first risk level if the duration of the water source multi-unit in the second risk level is greater than the first duration threshold, or if the frequency of the water source multi-unit entering the second risk level is greater than the first frequency threshold, so as to enable the water source multi-unit to enter the second risk level more quickly.

[0146] If the duration of the water source multi-unit in the third risk level is greater than the second duration threshold, or the frequency of the water source multi-unit entering the third risk level is greater than the second frequency threshold, the parameter thresholds corresponding to the second risk level shall be adjusted so that the water source multi-unit can enter the third risk level more quickly; the second duration threshold shall be less than the first duration threshold, and the second frequency threshold shall be less than the first frequency threshold.

[0147] In one embodiment, the control module 630 is further configured to, if the risk level of freezing and cracking is the first risk level, reduce the target cooling capacity of the water source multi-split unit by a first value according to the first control strategy, and reset the target temperature of the indoor unit based on the reduced cooling capacity.

[0148] If the risk level of freezing and cracking is the second risk level, the target cooling capacity of the water source multi-split unit will be reduced by a second value according to the second control strategy, and the target temperature of the indoor unit will be reset based on the reduced cooling capacity; the second value is greater than the first value.

[0149] If the risk level of freezing cracking is level three, control some or all of the internal machines by implementing the third control strategy.

[0150] In one embodiment, the control module 630 is further configured to control the first indoor unit according to the first control strategy if the risk level of freezing cracking is the first risk level, until the first indoor unit resets the target temperature.

[0151] If the risk level of freezing and cracking is the second risk level, control the first and second indoor units according to the second control strategy until both the first and second indoor units reset to the target temperature.

[0152] Each module in the control device of the aforementioned multi-unit water source can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in the processor of a computer device in hardware form or independent of it, or stored in the memory of a computer device in software form, so that the processor can call and execute the operations corresponding to each module.

[0153] In one embodiment, a computer device is provided, which may be a terminal, and its internal structure diagram may be as follows: Figure 7 As shown, the computer device includes a processor, memory, input / output interface, communication interface, display unit, and input device. The processor, memory, and input / output interface are connected via a system bus, and the communication interface, display unit, and input device are also connected to the system bus via the input / output interface. The processor provides computing and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The input / output interface is used for exchanging information between the processor and external devices. The communication interface is used for wired or wireless communication with external terminals; wireless communication can be achieved through Wi-Fi, mobile cellular networks, NFC (Near Field Communication), or other technologies. When the computer program is executed by the processor, it implements a control method for a multi-unit water supply system. The display unit is used to form a visually visible image and can be a display screen, projection device, or virtual reality imaging device. The display screen can be an LCD screen or an e-ink screen. The input device of the computer device can be a touch layer covering the display screen, or buttons, trackballs, or touchpads set on the casing of the computer device, or external keyboards, touchpads, or mice, etc.

[0154] Those skilled in the art will understand that Figure 7 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0155] In one embodiment, a computer device is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to perform the following steps:

[0156] Obtain multi-dimensional operating parameters of the water source multi-unit, including the pipeline status parameters of the plate heat exchanger and the internal pressure parameters of the unit;

[0157] The freezing risk level of the plate heat exchanger is determined based on multi-dimensional operating parameters and target freezing risk assessment strategy;

[0158] Based on the level of risk of freezing and cracking, the corresponding indoor unit control strategy is implemented to dynamically adjust the operating load of the water source multi-unit.

[0159] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon, the computer program performing the following steps when executed by a processor:

[0160] Obtain multi-dimensional operating parameters of the water source multi-unit, including the pipeline status parameters of the plate heat exchanger and the internal pressure parameters of the unit;

[0161] The freezing risk level of the plate heat exchanger is determined based on multi-dimensional operating parameters and target freezing risk assessment strategy;

[0162] Based on the level of risk of freezing and cracking, the corresponding indoor unit control strategy is implemented to dynamically adjust the operating load of the water source multi-unit.

[0163] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, performs the following steps:

[0164] Obtain multi-dimensional operating parameters of the water source multi-unit, including the pipeline status parameters of the plate heat exchanger and the internal pressure parameters of the unit;

[0165] The freezing risk level of the plate heat exchanger is determined based on multi-dimensional operating parameters and target freezing risk assessment strategy;

[0166] Based on the level of risk of freezing and cracking, the corresponding indoor unit control strategy is implemented to dynamically adjust the operating load of the water source multi-unit.

[0167] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0168] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0169] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A control method for a multi-unit water source generator set, characterized in that, include: The multi-dimensional operating parameters of the water source multi-unit are obtained, wherein the multi-dimensional operating parameters include the pipeline status parameters of the plate heat exchanger and the internal pressure parameters of the unit; Based on the multidimensional operating parameters and the target freeze-cracking risk assessment strategy, the freeze-cracking risk level of the plate heat exchanger is determined; The corresponding indoor unit control strategy is executed according to the freezing and cracking risk level to dynamically adjust the operating load of the water source multi-unit.

2. The control method according to claim 1, characterized in that, The multidimensional operating parameters include refrigerant inlet temperature, refrigerant outlet temperature, water inlet temperature, water outlet temperature, and saturation temperature corresponding to suction pressure. The step of determining the freeze-cracking risk level of the plate heat exchanger based on the multi-dimensional operating parameters and the target freeze-cracking risk assessment strategy includes: Obtain parameter thresholds corresponding to different freezing and cracking risk levels; the parameter thresholds include refrigerant temperature threshold, water pipe temperature threshold, inlet and outlet water temperature difference threshold, and saturation temperature threshold; The multidimensional operating parameters are compared with the corresponding parameter thresholds. If the multidimensional operating parameters meet the parameter conditions corresponding to any risk level, the freezing crack risk level of the plate heat exchanger is determined as the corresponding risk level.

3. The control method according to claim 2, characterized in that, The method further includes: A virtual digital twin model of the plate heat exchanger is constructed, and the internal heat exchange state of the plate heat exchanger under different environmental parameters is simulated in real time; the environmental parameters include ambient temperature and ambient humidity. Based on the internal heat exchange state of the plate heat exchanger under different environmental parameters, the parameter thresholds corresponding to different freeze-cracking risk levels are determined.

4. The control method according to claim 1, characterized in that, After implementing the corresponding indoor unit control strategy based on the freezing crack risk level to dynamically adjust the operating load of the water source multi-unit, the method further includes: The multi-dimensional operating parameters of the plate heat exchanger are continuously monitored, and the freezing risk level of the plate heat exchanger is determined based on the multi-dimensional operating parameters and the target freezing risk assessment strategy. If the risk level of freezing and cracking of the plate heat exchanger decreases, the water source multi-unit shall be controlled to return to normal operation. If the freezing risk level of the plate heat exchanger remains unchanged and the duration exceeds the preset duration threshold, or if the freezing risk level of the plate heat exchanger increases, the water source multi-unit will be shut down and a maintenance alarm strategy will be implemented.

5. The control method according to claim 1, characterized in that, The frost cracking risk level includes a first risk level, a second risk level, and a third risk level; the first risk level is lower than the second risk level, and the second risk level is lower than the third risk level; The step of determining the freeze-cracking risk level of the plate heat exchanger based on the multi-dimensional operating parameters and the target freeze-cracking risk assessment strategy includes: If the refrigerant outlet temperature is less than or equal to the first refrigerant temperature threshold, the refrigerant inlet temperature is greater than or equal to the second refrigerant temperature threshold, the water inlet temperature is less than or equal to the first water pipe temperature threshold, the water outlet temperature is greater than or equal to the second water pipe temperature threshold, the water inlet and outlet temperature difference is less than or equal to the first inlet and outlet temperature difference threshold and greater than or equal to the second inlet and outlet temperature difference threshold, or the saturation temperature corresponding to the suction pressure is less than or equal to the first saturation temperature threshold and greater than or equal to the second saturation temperature threshold, the plate heat exchanger is determined to be at the first risk level of freezing. If the refrigerant outlet temperature is less than the second refrigerant temperature threshold, the refrigerant inlet temperature is greater than or equal to the third refrigerant temperature threshold, the water inlet temperature is less than the second water pipe temperature threshold, the water outlet temperature is greater than or equal to the third water pipe temperature threshold, the water inlet and outlet temperature difference is less than the second inlet and outlet temperature difference threshold and greater than or equal to the third inlet and outlet temperature difference threshold, or the saturation temperature corresponding to the suction pressure is less than the second saturation temperature threshold and greater than or equal to the third saturation temperature threshold, the freezing crack risk level of the plate heat exchanger is determined to be the second risk level. The plate heat exchanger is classified as having a third risk level of freezing and cracking when the refrigerant outlet temperature is less than the third refrigerant temperature threshold, the refrigerant inlet temperature is less than the third refrigerant temperature threshold, the water inlet temperature is less than the third water pipe temperature threshold, the water outlet temperature is less than the third water pipe temperature threshold, the water inlet-outlet temperature difference is less than the third inlet-outlet temperature difference threshold, or the saturation temperature corresponding to the suction pressure is less than the third saturation temperature threshold. Specifically, the first refrigerant temperature threshold is greater than the second refrigerant temperature threshold, the second refrigerant temperature threshold is greater than the third refrigerant temperature threshold, the first water pipe temperature threshold is greater than the second water pipe temperature threshold, the second water pipe temperature threshold is greater than the third water pipe temperature threshold, the first inlet-outlet temperature difference threshold is less than the second inlet-outlet temperature difference threshold, the second inlet-outlet temperature difference threshold is less than the third inlet-outlet temperature difference threshold, the first saturation temperature threshold is greater than the second saturation temperature threshold, and the second saturation temperature threshold is greater than the third saturation temperature threshold.

6. The method according to claim 5, characterized in that, The method further includes: If the duration of the water source multi-unit in the second risk level is greater than the first duration threshold, or the frequency of the water source multi-unit entering the second risk level is greater than the first frequency threshold, the parameter threshold corresponding to the first risk level is adjusted so that the water source multi-unit can enter the second risk level more quickly. If the duration of the water source multi-unit in the third risk level is greater than the second duration threshold, or the frequency of the water source multi-unit entering the third risk level is greater than the second frequency threshold, the parameter threshold corresponding to the second risk level is adjusted so that the water source multi-unit can enter the third risk level more quickly; the second duration threshold is less than the first duration threshold, and the second frequency threshold is less than the first frequency threshold.

7. The method according to claim 1, characterized in that, The step of executing the corresponding indoor unit control strategy based on the freezing crack risk level to dynamically adjust the operating load of the water source multi-unit includes: If the freezing and cracking risk level is the first risk level, the target cooling capacity of the water source multi-split unit is reduced by a first value according to the first control strategy, and the target temperature of the indoor unit is reset based on the reduced cooling capacity. If the freezing risk level is the second risk level, the target cooling capacity of the water source multi-split unit is reduced by a second value according to the second control strategy, and the target temperature of the indoor unit is reset based on the reduced cooling capacity; the second value is greater than the first value. If the risk level of freezing cracking is the third risk level, control part or all of the internal machines to shut down in accordance with the third control strategy.

8. The method according to claim 7, characterized in that, The water source multi-unit includes a first indoor unit and a second indoor unit; the method further includes: If the freezing risk level is the first risk level, the first indoor unit is controlled according to the first control strategy until the first indoor unit resets the target temperature. If the risk level of freezing and cracking is the second risk level, the first indoor unit and the second indoor unit are controlled according to the second control strategy until both the first indoor unit and the second indoor unit reset the target temperature.

9. A control device for a multi-unit water source generator set, characterized in that, The apparatus for performing the control method of the water source multi-unit according to any one of claims 1-8, the apparatus comprising: The acquisition module is used to acquire multi-dimensional operating parameters of the water source multi-unit, wherein the multi-dimensional operating parameters include the pipeline status parameters of the plate heat exchanger and the internal pressure parameters of the unit; The determination module is used to determine the freezing risk level of the plate heat exchanger based on the multidimensional operating parameters and the target freezing risk assessment strategy. The control module is used to execute the corresponding indoor unit control strategy according to the freezing and cracking risk level, so as to dynamically adjust the operating load of the water source multi-unit.

10. A multi-split water source unit, characterized in that, include: Data acquisition components, cooling components, and control components; The control component is connected to the data acquisition component and the cooling component respectively; The data acquisition component is used to acquire multi-dimensional operating parameters of the water source multi-unit, wherein the multi-dimensional operating parameters include the pipeline status parameters of the plate heat exchanger and the internal pressure parameters of the unit; The refrigeration component is used to achieve the refrigeration function; The control component is used to control the refrigeration component according to the control method of the water source multi-unit according to any one of claims 1-8.

11. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1-8.

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