Control method, control device, water chiller and computer readable storage medium

Abstract

The present disclosure provides a control method, a control device, a water chiller and a computer readable storage medium. The control method comprises: in the case that all modules of the water chiller are running or only part of the modules are running, if there is at least one module whose load is greater than a first threshold value and at least one module whose load is less than a second threshold value among all running modules, obtaining a module with the highest load and a module with the lowest load among all running modules, wherein the first threshold value is greater than the second threshold value; calculating a first difference between the highest load and a third threshold value and a second difference between the third threshold value and the lowest load; and in the case that at least one of the first difference and the second difference is greater than a fourth threshold value and a difference between the highest load and the lowest load is greater than a fifth threshold value, performing a load reduction operation on the module with the highest load and performing a load increase operation on the module with the lowest load.

Description

Technical Field

[0001] This disclosure relates to the field of chiller technology, and in particular to a control method, control device, chiller unit, and computer-readable storage medium. Background Technology

[0002] Under the same operating conditions, chiller units achieve their optimal energy efficiency ratio when the load is controlled between 70% and 80%. However, current load control strategies for multi-module chillers typically maintain consistent load control across multiple modules. This results in some modules operating at full load while others are on standby, or multiple modules maintaining low-frequency operation for extended periods. Consequently, the energy efficiency of multi-module chillers in related technologies is relatively low. Summary of the Invention

[0003] One technical problem addressed by this disclosure is that the operating energy efficiency of multi-module chiller units in related technologies is relatively low.

[0004] According to one aspect of this disclosure, a control method for a chiller unit is provided, wherein the chiller unit includes multiple modules, and the control method includes: when all or only some of the modules of the chiller unit are operating, if at least one module among all operating modules has a load greater than a first threshold and at least one module has a load less than a second threshold, then obtaining the module with the highest load and the module with the lowest load among all operating modules, wherein the first threshold is greater than the second threshold; calculating a first difference between the highest load and a third threshold and a second difference between the third threshold and the lowest load; and if at least one of the first difference and the second difference is greater than a fourth threshold and the difference between the highest load and the lowest load is greater than a fifth threshold, performing a load reduction operation on the module with the highest load and a load operation on the module with the lowest load.

[0005] In some embodiments, performing a load reduction operation on the module with the highest load and a load operation on the module with the lowest load includes: detecting the rate of change of the outlet water temperature of the chiller unit; and, if the rate of change of the outlet water temperature is less than a sixth threshold, performing a load reduction operation on the module with the highest load and a load operation on the module with the lowest load.

[0006] In some embodiments, a load reduction operation is performed on the module with the highest load to reduce the load of the module with the highest load to the third threshold; a load operation is performed on the module with the lowest load to increase the load reduced by the module with the highest load.

[0007] In some embodiments, the control method further includes: performing a first control operation on all running modules when the load of all running modules is less than the second threshold.

[0008] In some embodiments, performing a first control operation on all running modules includes: if all running modules are a single module, maintaining the current running state of that module unchanged; if all running modules are two modules, and if the sum of the loads of the two modules is less than or equal to a seventh threshold, shutting down the module with the longer running time and performing a loading operation on the other module, otherwise maintaining the current running state of the two modules unchanged; and if the number of all running modules is greater than 2, shutting down the module with the longest running time and performing a loading operation on the remaining running modules.

[0009] In some embodiments, performing a first control operation on all running modules includes: if all running modules are a single module, maintaining the current running state of that module unchanged; if the number of all running modules is greater than or equal to 2, detecting the runtime of all running modules; if at least one of the running modules has a runtime less than or equal to an eighth threshold, maintaining the current running state of all running modules unchanged; and if the runtime of all running modules is greater than the eighth threshold, performing corresponding processing on the running modules according to the number of all running modules.

[0010] In some embodiments, processing the running modules according to the number of all running modules includes: if there are two running modules, and the sum of the loads of the two modules is less than or equal to a seventh threshold, then shutting down the module with the longer runtime and performing a loading operation on the other module; otherwise, keeping the current running state of the two modules unchanged; and if the number of all running modules is greater than 2, shutting down the module with the longest runtime and performing a loading operation on the remaining running modules.

[0011] In some embodiments, the control method further includes: if only some modules of the plurality of modules of the chiller are operating, and if the load of all operating modules is greater than the first threshold, then performing a second control operation on all operating modules.

[0012] In some embodiments, performing the second control operation on all running modules includes: performing a load reduction operation on all running modules and starting one module.

[0013] In some embodiments, performing a second control operation on all operating modules includes: detecting the rate of change of the outlet water temperature of the chiller unit; if the rate of change of the outlet water temperature is greater than or equal to a ninth threshold, maintaining the current operating state of all operating modules for a predetermined period of time, and re-detecting the rate of change of the outlet water temperature of the chiller unit after the predetermined period of time; and if the rate of change of the outlet water temperature is less than the ninth threshold, performing a load reduction operation on all operating modules and starting one module.

[0014] In some embodiments, a load reduction operation is performed on all running modules to reduce the load of all running modules to the third threshold.

[0015] In some embodiments, the third threshold is the optimal load value for module operation.

[0016] In some embodiments, the third threshold is equal to the first threshold.

[0017] According to another aspect of this disclosure, a control device for a chiller unit is provided, wherein the chiller unit includes multiple modules, and the control device includes: an acquisition unit, configured to, when all or only some of the multiple modules of the chiller unit are operating, acquire the module with the highest load and the module with the lowest load among all operating modules if at least one module has a load greater than a first threshold and at least one module has a load less than a second threshold, wherein the first threshold is greater than the second threshold; a calculation unit, configured to calculate a first difference between the highest load and a third threshold and a second difference between the third threshold and the lowest load; and an execution control unit, configured to, when at least one of the first difference and the second difference is greater than a fourth threshold and the difference between the highest load and the lowest load is greater than a fifth threshold, perform a load reduction operation on the module with the highest load and a load operation on the module with the lowest load.

[0018] According to another aspect of this disclosure, a control device for a chiller unit is provided, comprising: a memory; and a processor coupled to the memory, the processor being configured to execute the control method as described above based on instructions stored in the memory.

[0019] According to another aspect of this disclosure, a chiller unit is provided, comprising: the control device as described above.

[0020] In some embodiments, the chiller unit further includes: a plurality of modules, each module including a compressor, a condenser and an evaporator.

[0021] According to another aspect of this disclosure, a computer-readable storage medium is provided that stores computer program instructions thereon, which, when executed by a processor, implement the control method as described above.

[0022] The above control method can make the load distribution of the modules more uniform, that is, the adjusted load distribution is more uniform than the original load distribution, thereby improving the operating efficiency of the multi-module chiller unit.

[0023] Other features and advantages of this disclosure will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0024] The accompanying drawings, which form part of this specification, illustrate embodiments of this disclosure and, together with the specification, serve to explain the principles of this disclosure.

[0025] This disclosure will become clearer with reference to the accompanying drawings and the following detailed description, wherein:

[0026] Figure 1 This is a flowchart illustrating a control method for a chiller unit according to some embodiments of the present disclosure;

[0027] Figure 2 This is a flowchart illustrating a method for performing a first control operation on all running modules in a control method according to some embodiments of the present disclosure;

[0028] Figure 3 This is a flowchart illustrating a method for performing a first control operation on all operating modules in a control method according to other embodiments of the present disclosure;

[0029] Figure 4 This is a schematic block diagram illustrating the structure of a control device for a chiller unit according to some embodiments of the present disclosure;

[0030] Figure 5 This is a schematic block diagram illustrating the structure of a control device for a chiller unit according to other embodiments of the present disclosure;

[0031] Figure 6 This is a schematic block diagram illustrating the structure of a control device for a chiller unit according to other embodiments of the present disclosure;

[0032] Figure 7 This is a schematic diagram illustrating the structural block diagram of a chiller unit according to some embodiments of the present disclosure. Detailed Implementation

[0033] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present disclosure.

[0034] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.

[0035] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this disclosure or its application or use.

[0036] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0037] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0038] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0039] In the embodiments of this disclosure, the chiller unit includes multiple modules. Each module includes a compressor, a condenser, and an evaporator, etc. That is, each module is a complete circulation system, including a compressor, a condenser, an evaporator, etc., and the whole composed of multiple modules is the chiller unit.

[0040] Figure 1 This is a flowchart illustrating a control method for a chiller unit according to some embodiments of the present disclosure. The chiller unit includes multiple modules. (Example...) Figure 1 As shown, the control method includes steps S102 to S106.

[0041] In step S102, if multiple modules of the chiller unit are operating or only some modules are operating, and if at least one module among all operating modules has a load greater than a first threshold and at least one module has a load less than a second threshold, then the module with the highest load and the module with the lowest load among all operating modules are obtained, wherein the first threshold is greater than the second threshold.

[0042] In this step, the reason for obtaining the module with the highest load and the module with the lowest load among all operating modules is that if at least one module has a load greater than the first threshold and at least one module has a load less than the second threshold, it indicates that the difference between the module with the highest load and the module with the lowest load is relatively large. In this case, the load of multiple modules of the chiller unit is likely to be too uneven. Therefore, obtaining the module with the highest load and the module with the lowest load among all operating modules and possibly performing corresponding load balancing operations are necessary.

[0043] For example, when the unit is powered on, it checks whether all modules are running. Regardless of whether all modules are running or only some modules are running, it checks the operating load of each module in all running modules and determines whether there is at least one module whose load is greater than a first threshold and at least one module whose load is less than a second threshold. If so, it obtains the module with the highest load and the module with the lowest load from all running modules.

[0044] In some embodiments, the range of the first threshold is 70% to 80%. For example, the first threshold is 75%. The range of the first threshold is derived from actual engineering data and test evaluations. According to simulation tests, within a fixed ambient temperature range, the unit achieves the highest energy efficiency ratio and cost-effectiveness when operating at 70% to 80% of its load. Therefore, the above range of the first threshold facilitates the screening of modules operating at loads higher than the optimal load.

[0045] Of course, those skilled in the art will understand that the above-described range of the first threshold is merely exemplary, and the scope of this disclosure is not limited to the specific value of the first threshold. The first threshold can be set according to actual needs or circumstances.

[0046] In some embodiments, the range of the second threshold is 50% to 65%. For example, the second threshold is 65%. In actual test data, under the same ambient temperature, there is a significant drop in energy efficiency and a low cost-effectiveness of cooling capacity when the load is below 65%. Since most fixed-frequency units limit their load to 50% (it should be noted that 25% is only for extreme load conditions), setting the range of the second threshold to 50% to 65% can effectively determine whether the unit load meets the requirements, while avoiding the second threshold being too low and preventing the system from entering this control logic.

[0047] Of course, those skilled in the art will understand that the above-described range of the second threshold is merely exemplary, and the scope of this disclosure is not limited to the specific value of the second threshold. The second threshold can be set according to actual needs or circumstances.

[0048] In step S104, the first difference between the highest load and the third threshold and the second difference between the third threshold and the lowest load are calculated.

[0049] In other words, the first difference A is

[0050] A = Q H -Y3, (1)

[0051] Among them, Q H Y1 represents the highest load (also known as the maximum load), and Y2 represents the third threshold.

[0052] The second difference B is

[0053] B = Y3 - Q L (2)

[0054] Where Y3 is the third threshold, Q L This is the minimum load (also known as the lowest load).

[0055] In some embodiments, the third threshold is the optimal load value for module operation. This facilitates the calculation of the difference between the highest load and the optimal load value, as well as the difference between the optimal load value and the lowest load value, thereby making it easier to know the deviation of the module with the highest load and the module with the lowest load from the optimal load value, and then perform corresponding processing based on the deviation.

[0056] In some embodiments, the third threshold is equal to the first threshold. The equality of these two thresholds facilitates the implementation of the control method, thereby benefiting subsequent load control of the chiller unit's modules.

[0057] In some embodiments, the third threshold ranges from 70% to 80%. For example, the third threshold is 75%. Similar to the first threshold, the range of the third threshold is derived from actual engineering data and test evaluations. According to simulation tests, within a fixed ambient temperature range, the unit achieves its highest energy efficiency ratio and cost-effectiveness when operating at 70% to 80% of its load. Therefore, the aforementioned range of the third threshold facilitates the calculation of the difference between the highest load and the optimal load value, as well as the difference between the optimal load value and the lowest load value. This allows for easy identification of the deviations of the modules with the highest load and the modules with the lowest load from their optimal load values, enabling appropriate processing based on these deviations.

[0058] Of course, those skilled in the art will understand that the above-described range of the third threshold is merely exemplary, and the scope of this disclosure is not limited to the specific value of the third threshold. The third threshold can be set according to actual needs or circumstances.

[0059] In step S106, if at least one of the first difference and the second difference is greater than the fourth threshold and the difference between the highest load and the lowest load is greater than the fifth threshold, a load reduction operation is performed on the module with the highest load and a load operation is performed on the module with the lowest load.

[0060] For example, determine if both the first and second differences are less than the fourth threshold. If so, the modules are currently running within their optimal operating range, and therefore no processing is required. For instance, the process can return to the step at program startup where the group checks if all modules are running while powered on. Otherwise, it indicates that at least one of the first and second differences is greater than the fourth threshold, and the difference between the highest and lowest loads (i.e., Q) is then determined. H -Q L Whether it is less than or equal to the fifth threshold.

[0061] If the difference between the highest load and the lowest load is less than or equal to the fifth threshold, no action is taken on the module. For example, the process can return to the step at the beginning of the program where the group checks whether all modules are running when it is powered on. Otherwise, if the difference between the highest load and the lowest load is greater than the fifth threshold, a load reduction operation is performed on the module with the highest load, and a load operation is performed on the module with the lowest load.

[0062] Here, the unloading operation is the operation of reducing the operating load (also known as the unloading operation), which is the operation of reducing the output capacity of the chiller unit; the loading operation is the operation of increasing the operating load, which is the operation of increasing the output capacity of the chiller unit.

[0063] In some embodiments, the fourth threshold ranges from 5% to 10%. For example, the fourth threshold is 5%. The range of the fourth threshold is to determine whether the first difference and the second difference are within a relatively small range, so as to facilitate subsequent operations when at least one of the first difference and the second difference is greater than the fourth threshold.

[0064] Of course, those skilled in the art will understand that the above range of the fourth threshold is merely exemplary, and the scope of this disclosure is not limited to the specific value of the fourth threshold. The fourth threshold can be set according to actual needs or circumstances.

[0065] In some embodiments, the fifth threshold ranges from 12% to 18%. For example, the fifth threshold is 15%. This range of the fifth threshold is used to determine the relationship between the difference between the highest load and the lowest load and the fifth threshold. When the difference between the highest load and the lowest load is greater than the fifth threshold, it indicates that the difference between the highest load and the lowest load is relatively large. In this case, the load of multiple modules of the chiller unit is likely to be too uneven. Therefore, a load reduction operation is performed on the module with the highest load, and a load loading operation is performed on the module with the lowest load, so as to make the load distribution of the modules as even as possible.

[0066] Of course, those skilled in the art will understand that the above-described range of the fifth threshold is merely exemplary, and the scope of this disclosure is not limited to the specific value of the fifth threshold. The fifth threshold can be set according to actual needs or circumstances.

[0067] In some embodiments, a load reduction operation is performed on the module with the highest load to reduce its load to a third threshold. This allows the module with the highest load to operate at its optimal load as much as possible, thereby making the load distribution of the modules more uniform (i.e., the adjusted load distribution is more uniform than the original load distribution), and thus improving the operating energy efficiency of the multi-module chiller unit.

[0068] In some embodiments, if multiple modules have the highest load, the module with the longest runtime is selected for optimal load adjustment. That is, the module with the highest load and the longest runtime is subjected to load reduction. After this adjustment is completed, the optimal load detection and determination are performed again and the adjustment is carried out one after another. This can minimize the impact on the user side.

[0069] In some embodiments, a loading operation is performed on the module with the lowest load to increase the load reduced by the module with the highest load. That is, the same amount of load reduction by the module with the highest load is applied to the module with the lowest load. In other words, the load reduction of the module with the highest load is added to the module with the lowest load. This allows for a more uniform load distribution among the modules (i.e., a more even load distribution than the original) without changing the overall load of the chiller unit, thereby improving the operating efficiency of the multi-module chiller unit.

[0070] Therefore, a control method for a chiller unit according to some embodiments of the present disclosure is provided. The control method includes: when multiple modules of the chiller unit are operating or only some modules are operating, if at least one module among all operating modules has a load greater than a first threshold and at least one module has a load less than a second threshold, then obtaining the module with the highest load and the module with the lowest load among all operating modules, wherein the first threshold is greater than the second threshold; calculating a first difference between the highest load and a third threshold and a second difference between the third threshold and the lowest load; and if at least one of the first and second differences is greater than a fourth threshold and the difference between the highest and lowest load is greater than a fifth threshold, performing a load reduction operation on the module with the highest load and a load increase operation on the module with the lowest load. This method can make the load distribution of the modules as uniform as possible, that is, the adjusted load distribution is more uniform than the original load distribution, thereby improving the operating energy efficiency of the multi-module chiller unit.

[0071] In some embodiments, performing a load reduction operation on the module with the highest load and a load operation on the module with the lowest load includes: detecting the rate of change of the outlet water temperature of the chiller unit; and performing a load reduction operation on the module with the highest load and a load operation on the module with the lowest load when the rate of change of the outlet water temperature is less than a sixth threshold.

[0072] For example, in typical engineering applications, the water systems of a single chiller unit are connected in series, and there may only be one outlet. Therefore, the outlet water temperature of the chiller unit can be obtained from this outlet, and the rate of change of the outlet water temperature can be calculated. Alternatively, if the chiller unit has multiple outlets, multiple outlet water temperatures can be obtained from these outlets, and the average value of the outlet water temperature can be calculated, thereby allowing the calculation of the rate of change of the outlet water temperature.

[0073] The formula for calculating the rate of change of water temperature ΔT is as follows:

[0074]

[0075] Where T0 is the initial outlet water temperature of the chiller unit, T t This represents the outlet water temperature after time t, where t is the elapsed time. For example, t is 10 seconds.

[0076] In the above embodiment, a water temperature change rate judgment condition is added before performing load reduction and loading operations on the modules. If the water temperature change rate ΔT ≥ the sixth threshold ΔTc when all modules are running, it indicates that the actual demand on the user side is changing rapidly, and the unit's current operating status is maintained. For example, the process can return to the step at the beginning of the program where the unit is running and all modules are checked. If the water temperature change rate ΔT < ΔTc, it indicates that the water temperature change rate is slow, meaning that the user-side load fluctuation is not significant and each module is in a steady state, allowing for optimal load adjustment of each module. Therefore, the above embodiment achieves the goal of optimal load adjustment of modules when the user-side load fluctuation is not significant and each module is in a steady state, facilitating load adjustment implementation and reducing the possibility of failures caused by load conditions when the actual demand on the user side changes rapidly.

[0077] In the above embodiment, the reason why the water temperature change rate ΔT≥ΔTc proves that the actual demand on the user side changes rapidly at this time. Therefore, the unit operation status is maintained without any action because the actual demand on the user side changes rapidly, indicating that the actual demand on the user side is changing (e.g., the morning working hours in an office building). At this time, there are module opening and closing actions. Entering the optimal load adjustment may disrupt the unit start-up control and affect the demand on the user side. Therefore, the optimal load adjustment can be carried out after the unit operation is basically stable.

[0078] In some embodiments, a load reduction operation is performed on the module with the highest load to reduce its load to a third threshold; a load increase operation is performed on the module with the lowest load to increase the load reduced by the module with the highest load. This allows for a more uniform load distribution among the modules (i.e., a more uniform load distribution than the original) without changing the overall load of the chiller unit, thereby improving the operating efficiency of the multi-module chiller unit.

[0079] In some embodiments, the range of the sixth threshold is from 0.5°C / min to 1°C / min. Generally, a water temperature change rate below 0.5°C / min is considered normal fluctuation in water temperature, while a water temperature change rate exceeding 1°C / min may make the judgment range too stringent and make it difficult to enter the optimal load adjustment. Therefore, the range of the above-mentioned sixth threshold is beneficial for implementing optimal load adjustment of the module.

[0080] Of course, those skilled in the art will understand that the above-described range of the sixth threshold is merely exemplary, and the scope of this disclosure is not limited to the specific value of the sixth threshold. The sixth threshold can be set according to actual needs or circumstances.

[0081] In other embodiments, as described above, in step 106, the rate of change of the chiller's outlet water temperature may not be detected. Instead, the module with the highest load may be unloaded, and the module with the lowest load may be loaded. This simplifies the procedure and facilitates implementation.

[0082] In some embodiments, the control method further includes: performing a first control operation on all running modules when the load of all running modules is less than a second threshold.

[0083] For example, when all modules of the chiller unit are running (i.e., all modules are running), in the process of determining whether at least one module among all running modules has a load greater than a first threshold and at least one module has a load less than a second threshold, if yes, then the module with the highest load and the module with the lowest load are obtained from all running modules; if no, then it is determined whether the load of all running modules is less than the second threshold; if the load of all running modules is less than the second threshold, then a first control operation is performed on all running modules; otherwise, no processing is performed on the modules. For example, the process can return to the step at the beginning of the program where the unit is in the power-on state and checks whether all modules are running.

[0084] In the above embodiment, when the load of all operating modules is less than the second threshold, a first control operation is performed on all operating modules, thereby entering a multi-module low-load operation control mode. This facilitates improving the operating energy efficiency of the multi-module chiller unit when the load of all operating modules is low.

[0085] In some embodiments, when only some modules are running, it can be first detected whether the load of all running modules is less than a second threshold, and then it can be determined whether there is at least one module whose load is greater than a first threshold and at least one module whose load is less than the second threshold. In other words, if some modules are in standby mode, it indicates that the actual load demand is relatively low. In this case, it is more likely that multiple modules will operate under low load. From the perspective of communication control and reliability, separate multi-path control and fewer decision conditions can make the system more stable and reduce the occurrence of communication failures.

[0086] In some embodiments, performing a first control operation on all operating modules includes: if all operating modules are single modules, maintaining the current operating state of that module unchanged; if all operating modules are two modules, and if the sum of the loads of the two modules is less than or equal to a seventh threshold, shutting down the module with the longer operating time and performing a loading operation on the other module, otherwise maintaining the current operating state of the two modules unchanged; and if the number of operating modules is greater than two, shutting down the module with the longest operating time and performing a loading operation on the remaining operating modules. In this embodiment, by executing different control logics on different numbers of operating modules during the execution of the first control operation, corresponding processing can be performed for different numbers of operating modules, thereby improving the operating energy efficiency of the multi-module chiller unit.

[0087] For example, during the first control operation on all running modules, if the number of all running modules is 1, since only one module is running, there is no need to process that module, and the current running state of that module remains unchanged.

[0088] For example, during the first control operation on all running modules, if the number of running modules is two, it is determined whether the sum of the loads of the two modules is less than or equal to the seventh threshold. If so, it indicates that the demand can be met by turning on one module, so the module with the longer running time can be turned off, and a loading operation can be performed on the other module, for example, the load of the turned-off module can be added to the running module. If the sum of the loads of the two modules is greater than the seventh threshold, it indicates that the demand cannot be met by turning on one module, so the current operating state of the two modules needs to be kept unchanged. This control logic can maximize the operating energy efficiency of the multi-module chiller unit.

[0089] In some embodiments, the seventh threshold ranges from 70% to 80%. For example, the seventh threshold is 80%. This range of the seventh threshold allows multi-module chillers to operate at their optimal energy efficiency.

[0090] Of course, those skilled in the art will understand that the above range of the seventh threshold is merely exemplary, and the scope of this disclosure is not limited to the specific value of the seventh threshold. The seventh threshold can be set according to actual needs or circumstances.

[0091] Additionally, it should be noted that if the sum of the loads of the two modules is less than or equal to the seventh threshold, and if the runtimes of the two modules are equal, either module can be shut down and a loading operation can be performed on the other module. In other words, the runtime of one module can be artificially regarded as the longer runtime, so that module is shut down and a loading operation is performed on the other module.

[0092] For example, during the first control operation on all running modules, if the number of running modules is greater than two, the module with the longest running time is shut down, and a loading operation is performed on the remaining running modules. For instance, during the loading operation on the remaining running modules, the load of the shut-down module can be detected, and this load can be evenly distributed to the remaining modules. If low-load multi-module operation is still satisfied after loading, this operation is repeated. In this embodiment, by shutting down the module with the longest running time and performing a loading operation on the remaining running modules, the operating energy efficiency of the multi-module chiller unit can be improved.

[0093] In other embodiments, performing the first control operation on all operating modules includes: maintaining the current operating state of a single operating module if the number of operating modules is greater than or equal to two; detecting the runtime of all operating modules if the number of operating modules is greater than or equal to two; maintaining the current operating state of all operating modules if the runtime of at least one operating module is less than or equal to an eighth threshold; and performing appropriate processing on the operating modules based on the number of operating modules if the runtime of all operating modules is greater than the eighth threshold. In this embodiment, by executing different control logics for different numbers of operating modules during the execution of the first control operation, appropriate processing can be performed for different numbers of operating modules. Furthermore, when the number of operating modules is greater than or equal to two, the processing is also combined with the runtime of all operating modules and performed accordingly based on the number of operating modules. This can improve the operating energy efficiency of the multi-module chiller unit.

[0094] For example, during the first control operation on all running modules, if the number of all running modules is 1, since only one module is running, there is no need to process that module, and the current running state of that module remains unchanged.

[0095] For example, if the total number of running modules is greater than or equal to 2, the runtime of all running modules is checked. If at least one of the running modules has a runtime less than or equal to the eighth threshold, it indicates that the module may have been recently started. Therefore, the current running state of all running modules is maintained. This minimizes the risk of failure caused by subsequent processing (e.g., shutdown) immediately after a module is started. If the runtime of all running modules is greater than the eighth threshold, the running modules are processed accordingly based on the total number of running modules.

[0096] In some embodiments, the eighth threshold ranges from 10 minutes to 20 minutes. This time range of the eighth threshold can minimize the possibility of the module being turned off immediately after being turned on.

[0097] Of course, those skilled in the art will understand that the above range of the eighth threshold is merely exemplary, and the scope of this disclosure is not limited to the specific value of the eighth threshold. The eighth threshold can be set according to actual needs or circumstances.

[0098] In some embodiments, processing the running modules according to the number of all running modules includes: if there are two running modules, and the sum of the loads of the two modules is less than or equal to a seventh threshold, then shutting down the module with the longer runtime and performing a loading operation on the other module; otherwise, keeping the current running state of the two modules unchanged; and if the number of all running modules is greater than 2, shutting down the module with the longest runtime and performing a loading operation on the remaining running modules.

[0099] In other words, in the above embodiment, if the runtime of all running modules is greater than the eighth threshold and the number of running modules is 2, then it is determined whether the sum of the loads of the two modules is less than or equal to the seventh threshold. If so, it indicates that the demand can be met by turning on one module, so the module with the longer runtime can be turned off, and a loading operation can be performed on the other module, for example, the load of the turned-off module can be added to the running module. If the sum of the loads of the two modules is greater than the seventh threshold, it indicates that the demand cannot be met by turning on one module, so the current operating state of the two modules needs to be kept unchanged. This control logic can maximize the operating energy efficiency of the multi-module chiller unit.

[0100] Furthermore, if the runtime of all running modules exceeds the eighth threshold and the number of running modules is greater than two, the module with the longest runtime among all running modules is shut down, and a loading operation is performed on the remaining running modules. For example, during the loading operation on the remaining running modules, the load of the shut-down module can be detected, and this load can be evenly distributed to the remaining modules. If the low-load multi-module operation is still satisfied after loading is completed, this operation is repeated. In this embodiment, by shutting down the module with the longest runtime among all running modules and performing a loading operation on the remaining running modules, the operating energy efficiency of the multi-module chiller unit can be improved.

[0101] In some embodiments, the control method further includes: when all the multiple modules of the chiller unit are running, if the load of all running modules (i.e., the multiple modules) is greater than or equal to a first threshold, it indicates that the demand is high at this time and there is no need to control the optimal load. For example, the process can return to the step of detecting whether all modules are running when the unit is in the power-on state at the beginning of the program.

[0102] In some embodiments, the control method further includes: when only some modules of the chiller unit are operating, if the load of all operating modules is greater than a first threshold, then performing a second control operation on all operating modules. In this embodiment, for the case where only some modules are operating, if the load of those modules is greater than the first threshold, performing a second control operation on all operating modules improves the operating energy efficiency of the multi-module chiller unit.

[0103] In some embodiments, performing the second control operation on all operating modules includes: performing a load reduction operation on all operating modules and activating one module. In this embodiment, by performing a load reduction operation on all operating modules, the excessive load on these modules can be reduced, and by normally activating one module, the reduced load can be made up, thereby improving the operating energy efficiency of the multi-module chiller unit.

[0104] For example, load shedding operations can be performed on all operating modules to reduce their load to the third threshold. This allows all operating modules to approach their optimal load, thereby improving the operating energy efficiency of the multi-module chiller unit.

[0105] In other embodiments, performing a second control operation on all operating modules includes: detecting the rate of change of the outlet water temperature of the chiller unit; if the rate of change of the outlet water temperature is greater than or equal to a ninth threshold, maintaining the current operating state (i.e., the current operating mode) of all operating modules for a predetermined period of time, and re-detecting the rate of change of the outlet water temperature of the chiller unit after the predetermined period of time; and if the rate of change of the outlet water temperature is less than the ninth threshold, performing a load reduction operation on all operating modules and starting one module.

[0106] In the above embodiments, when only some modules are operating, if the rate of change of the outlet water temperature ΔT is greater than or equal to the ninth threshold ΔTd, activating the idle modules could easily cause greater water temperature fluctuations, triggering unit standby. Therefore, the aforementioned delay processing is performed. If the rate of change of the outlet water temperature ΔT is less than the ninth threshold ΔTd, this indicates that the water temperature fluctuation is not significant, and optimal load adjustment is performed. That is, load reduction is performed on all operating modules, and one module is activated. This can improve the operating energy efficiency of multi-module chiller units.

[0107] For example, load shedding operations can be performed on all operating modules to reduce their load to the third threshold. This allows all operating modules to approach their optimal load, thereby improving the operating energy efficiency of the multi-module chiller unit.

[0108] In some embodiments, the ninth threshold ranges from 1.0℃ / min to 1.5℃ / min. Within this range of water temperature change rate, it can be determined whether there is a sudden change in user demand (assuming office building closing time in the evening) or a sharp decrease in demand. For example, the module may not be adjusted during shutdown, thereby minimizing the possibility of malfunctions.

[0109] Of course, those skilled in the art will understand that the above-described range of the ninth threshold is merely exemplary, and the scope of this disclosure is not limited to the specific value of the ninth threshold. The ninth threshold can be set according to actual needs or circumstances.

[0110] In some embodiments, the predetermined duration ranges from 3 to 5 minutes. This time range facilitates response to changes in water temperature.

[0111] Of course, those skilled in the art will understand that the above-mentioned range of the predetermined duration is merely exemplary, and the scope of this disclosure is not limited to the specific value of the predetermined duration. The predetermined duration can be set according to actual needs or circumstances.

[0112] Figure 2This is a flowchart illustrating a method for performing a first control operation on all running modules in a control method according to some embodiments of the present disclosure. The first control operation is performed on all running modules when the load on all running modules is less than a second threshold. Figure 2 As shown, the method includes steps S202 to S216.

[0113] In step S202, the number of running modules, n, is detected. Here, n is a positive integer. When n≥2, the process proceeds to step S204; when n=1, the process proceeds to step S206.

[0114] In step S204, the runtime of all running modules is detected.

[0115] In step S206, maintain the current running state.

[0116] In step S208, it is determined whether the runtime of all running modules is greater than the eighth threshold. If yes, the process proceeds to step S206. If no, and n = 2, the process proceeds to step S210. If no, and n > 2, the process proceeds to step S212.

[0117] In step S210, it is determined whether the sum of the loads of the two modules is less than or equal to the seventh threshold. If so, the process proceeds to step S214; otherwise, the process proceeds to step S216.

[0118] In step S212, the module with the longest runtime among all running modules is shut down, and a loading operation is performed on the remaining running modules.

[0119] In step S214, the module with the longer runtime of the two modules is shut down, and a loading operation is performed on the other module of the two modules.

[0120] In step S216, maintain the current running state.

[0121] Thus, a method for performing a first control operation on all operating modules according to some embodiments of this disclosure is provided. In this method, during the execution of the first control operation, different control logic is executed for different numbers of operating modules, thereby enabling corresponding processing for different numbers of operating modules. Furthermore, when the number of all operating modules is greater than or equal to two, the operating time of all operating modules is considered, and corresponding processing is performed on the operating modules based on the total number of operating modules. This can improve the operating energy efficiency of multi-module chillers. The aforementioned first control operation can also minimize the risk of multiple modules operating at low load or low frequency for extended periods.

[0122] Figure 3This is a flowchart illustrating a method for performing a first control operation on all running modules in a control method according to other embodiments of the present disclosure. The first control operation is performed on all running modules when the load on all running modules is less than a second threshold. Figure 3 As shown, the method includes steps S302 to S312.

[0123] In step S302, the number n of running modules is detected. Here, n is a positive integer. When n = 2, the process proceeds to step S304; when n = 1, the process proceeds to step S310; when n > 2, the process proceeds to step S312.

[0124] In step S304, it is determined whether the sum of the loads of the two modules is less than or equal to the seventh threshold. If so, the process proceeds to step S306; otherwise, the process proceeds to step S308.

[0125] In step S306, the module with the longer runtime of the two modules is shut down, and a loading operation is performed on the other module of the two modules.

[0126] In step S308, maintain the current running state.

[0127] In step S310, maintain the current running state.

[0128] In step S312, the module with the longest runtime among all running modules is shut down, and a loading operation is performed on the remaining running modules.

[0129] Thus, a method for performing a first control operation on all operating modules is provided according to other embodiments of the present disclosure. In this method, during the execution of the first control operation, different control logic is executed for different numbers of operating modules, thereby enabling appropriate processing for different numbers of operating modules and improving the operating energy efficiency of the multi-module chiller unit. The aforementioned first control operation can also minimize the risk of multiple modules operating at low load or low frequency for extended periods.

[0130] The method of this disclosure detects the operating load of each module in the power-on state and coordinates module scheduling and loading or unloading of individual modules to enable the entire chiller to achieve optimal operating status in a more efficient and energy-saving manner.

[0131] Figure 4 This is a schematic structural block diagram illustrating a control device for a chiller unit according to some embodiments of the present disclosure. The chiller unit includes multiple modules. Figure 4 As shown, the control device includes: an acquisition unit 402, a calculation unit 404, and an execution control unit 406.

[0132] The acquisition unit 402 is used to acquire the module with the highest load and the module with the lowest load among all operating modules when multiple modules of the chiller unit are operating or only some modules are operating, provided that at least one module among all operating modules has a load greater than a first threshold and at least one module has a load less than a second threshold. The first threshold is greater than the second threshold.

[0133] The calculation unit 404 is used to calculate the first difference between the highest load and the third threshold and the second difference between the third threshold and the lowest load.

[0134] The execution control unit 406 is configured to perform a load reduction operation on the module with the highest load and a load operation on the module with the lowest load when at least one of the first difference and the second difference is greater than a fourth threshold and the difference between the highest load and the lowest load is greater than a fifth threshold.

[0135] Thus, a control device for a chiller unit according to some embodiments of the present disclosure is provided. The control device includes: an acquisition unit, configured to, when multiple modules of the chiller unit are operating or only some modules are operating, acquire the module with the highest load and the module with the lowest load among all operating modules, wherein the first threshold is greater than the second threshold, if at least one module among all operating modules has a load greater than a first threshold and at least one module has a load less than a second threshold; a calculation unit, configured to calculate a first difference between the highest load and a third threshold and a second difference between the third threshold and the lowest load; and an execution control unit, configured to, if at least one of the first and second differences is greater than a fourth threshold and the difference between the highest and lowest load is greater than a fifth threshold, perform a load reduction operation on the module with the highest load and a load increase operation on the module with the lowest load. This control device can make the load distribution of the modules as uniform as possible, that is, the adjusted load distribution is more uniform than the original load distribution, thereby improving the operating energy efficiency of the multi-module chiller unit.

[0136] In some embodiments, the execution control unit 406 is used to detect the rate of change of the outlet water temperature of the chiller unit, and when the rate of change of the outlet water temperature is less than a sixth threshold, to perform a load reduction operation on the module with the highest load and a load operation on the module with the lowest load.

[0137] In some embodiments, the execution control unit 406 is configured to perform a load reduction operation on the module with the highest load to reduce the load of the module with the highest load to a third threshold, and to perform a load operation on the module with the lowest load to increase the load reduced by the module with the highest load.

[0138] In some embodiments, the execution control unit 406 is further configured to perform a first control operation on all running modules when the load on all running modules is less than a second threshold.

[0139] In some embodiments, the execution control unit 406 is configured to: maintain the current operating state of a module when all running modules are a single module; when all running modules are two modules, shut down the module with the longer running time and perform a loading operation on the other module if the sum of the loads of the two modules is less than or equal to a seventh threshold, otherwise maintain the current operating state of the two modules; and shut down the module with the longest running time and perform a loading operation on the remaining running modules when the number of running modules is greater than 2.

[0140] In some embodiments, the execution control unit 406 is configured to: maintain the current running state of a module when all running modules are a single module; detect the runtime of all running modules when the number of all running modules is greater than or equal to 2; maintain the current running state of all running modules when at least one of the running modules has a runtime less than or equal to an eighth threshold; and process the running modules accordingly based on the number of all running modules when the runtime of all running modules is greater than the eighth threshold.

[0141] In some embodiments, the execution control unit 406 is configured to: when there are two modules running, if the sum of the loads of the two modules is less than or equal to a seventh threshold, shut down the module with the longer running time and perform a loading operation on the other module; otherwise, keep the current running state of the two modules unchanged; and when the number of all running modules is greater than 2, shut down the module with the longest running time and perform a loading operation on the remaining running modules.

[0142] In some embodiments, the execution control unit 406 is further configured to perform a second control operation on all operating modules if the load of all operating modules is greater than a first threshold when only some modules of the multiple modules of the chiller are operating.

[0143] In some embodiments, the execution control unit 406 is used to perform a load reduction operation on all running modules and start one module.

[0144] In some embodiments, the execution control unit 406 is used to detect the rate of change of the outlet water temperature of the chiller unit. If the rate of change of the outlet water temperature is greater than or equal to a ninth threshold, the current operating state of all operating modules is maintained for a predetermined period of time, and the rate of change of the outlet water temperature of the chiller unit is detected again after the predetermined period of time. If the rate of change of the outlet water temperature is less than the ninth threshold, a load reduction operation is performed on all operating modules, and one module is started.

[0145] In some embodiments, the execution control unit 406 is used to perform a load reduction operation on all running modules to reduce the load of all running modules to a third threshold.

[0146] In some embodiments, the third threshold is the optimal load value for module operation.

[0147] In some embodiments, the third threshold is equal to the first threshold.

[0148] Figure 5 This is a schematic block diagram illustrating a control device for a chiller unit according to other embodiments of the present disclosure. The control device includes a memory 510 and a processor 520. Wherein:

[0149] The memory 510 can be a disk, flash memory, or any other non-volatile storage medium. The memory is used for storage. Figures 1 to 3 At least one of the instructions in the corresponding embodiment.

[0150] Processor 420 is coupled to memory 510 and can be implemented as one or more integrated circuits, such as a microprocessor or microcontroller. Processor 420 executes instructions stored in memory to make the load distribution of the modules more uniform, i.e., more uniform than the original load distribution, thereby improving the operating energy efficiency of the multi-module chiller unit.

[0151] In some embodiments, it may also be as follows Figure 6 As shown, the control device 600 includes a memory 610 and a processor 620. The processor 620 is coupled to the memory 610 via a BUS bus 630. The control device 600 can also be connected to an external storage device 650 via a storage interface 640 to access external data, and can also be connected to a network or another computer system (not shown) via a network interface 660, which will not be described in detail here.

[0152] In this embodiment, by storing data instructions in the memory and then processing the instructions by the processor, the load distribution of the modules can be made more uniform. That is, compared with the original load distribution, the adjusted load distribution is more uniform, thereby improving the operating efficiency of the multi-module chiller unit.

[0153] According to some embodiments of this disclosure, a chiller unit is also provided, which includes the control device as described above (such as...). Figure 4 , Figure 5 or Figure 6 (The control device shown).

[0154] Figure 7 This is a schematic diagram illustrating the structural block diagram of a chiller unit according to some embodiments of the present disclosure.

[0155] like Figure 7 As shown, the chiller unit includes a control device 710. For example, the control device 710 is as follows: Figure 4 , Figure 5 or Figure 6 The control device shown.

[0156] In some embodiments, such as Figure 7 As shown, the chiller unit also includes multiple modules 1 to m. Here, m is a positive integer. Each module includes a compressor, a condenser, and an evaporator.

[0157] In other embodiments, this disclosure also provides a computer-readable storage medium (non-transitory computer-readable storage medium) having stored thereon computer program instructions that are implemented when executed by a processor. Figures 1 to 3 The disclosure includes at least one step of the method in a corresponding embodiment. Those skilled in the art will understand that embodiments of this disclosure can be provided as methods, apparatus, or computer program products. Therefore, this disclosure can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this disclosure can take the form of a computer program product embodied on one or more computer-usable non-transitory storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0158] This disclosure is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this disclosure. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create a machine for implementing the flowchart illustrations. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0159] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0160] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0161] This concludes the detailed description of the present disclosure. To avoid obscuring the concept of the disclosure, some details known in the art have not been described. Those skilled in the art will fully understand how to implement the technical solutions disclosed herein based on the above description.

[0162] While specific embodiments of this disclosure have been described in detail by way of example, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of this disclosure. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of this disclosure. The scope of this disclosure is defined by the appended claims.

Claims

1. A control method for a chiller unit, wherein, The chiller unit includes multiple modules, and the control method includes: When all or only some modules of the chiller unit are operating, if at least one module among all operating modules has a load greater than a first threshold and at least one module has a load less than a second threshold, then the module with the highest load and the module with the lowest load among all operating modules are obtained, wherein the first threshold and the second threshold are both thresholds related to the operating load of the module, and the first threshold is greater than the second threshold. Calculate a first difference between the highest load and a third threshold, and a second difference between the third threshold and the lowest load, wherein the third threshold is the optimal load value for module operation; and If at least one of the first difference and the second difference is greater than a fourth threshold and the difference between the highest load and the lowest load is greater than a fifth threshold, a load reduction operation is performed on the module with the highest load and a load operation is performed on the module with the lowest load, wherein the fourth threshold is a threshold related to the first difference and the second difference, and the fifth threshold is a threshold related to the difference between the highest load and the lowest load.

2. The control method according to claim 1, wherein, Performing a load reduction operation on the module with the highest load and a load operation on the module with the lowest load includes: The rate of change of the outlet water temperature of the chiller unit was detected; and If the rate of change of the outlet water temperature is less than the sixth threshold, the module with the highest load is unloaded and the module with the lowest load is loaded. The sixth threshold is a threshold related to the rate of change of the outlet water temperature.

3. The control method according to claim 1 or 2, wherein: Perform a load reduction operation on the module with the highest load to reduce the load of the module with the highest load to the third threshold. A loading operation is performed on the module with the lowest load to increase the load reduced by the module with the highest load.

4. The control method according to claim 1 further includes: If the load of all running modules is less than the second threshold, perform the first control operation on all running modules.

5. The control method according to claim 4, wherein, Performing the first control operation on all running modules includes: If all running modules are considered as one module, maintain the current running state of that module. If all running modules consist of two modules, and the sum of the loads of the two modules is less than or equal to a seventh threshold, then the module with the longer runtime is shut down, and a loading operation is performed on the other module. Otherwise, the current running state of the two modules remains unchanged. The seventh threshold is a threshold used to determine whether enabling a module can meet the requirements. If the number of all running modules is greater than 2, shut down the module with the longest runtime among all running modules, and perform a loading operation on the remaining running modules.

6. The control method according to claim 4, wherein, Performing the first control operation on all running modules includes: If all running modules are considered as one module, maintain the current running state of that module. If the number of all running modules is greater than or equal to 2, detect the runtime of all running modules. If at least one of the running modules has a runtime less than or equal to an eighth threshold, the current running state of all running modules remains unchanged, wherein the eighth threshold is a threshold related to the runtime of the module; and If the runtime of all running modules exceeds the eighth threshold, the running modules are processed accordingly based on the total number of running modules.

7. The control method according to claim 6, wherein, The processing of running modules based on the total number of running modules includes: If all running modules consist of two modules, and the sum of the loads of the two modules is less than or equal to the seventh threshold, then the module with the longer runtime is shut down, and a loading operation is performed on the other module; otherwise, the current running state of the two modules remains unchanged. If the number of all running modules is greater than 2, shut down the module with the longest runtime among all running modules, and perform a loading operation on the remaining running modules.

8. The control method according to claim 1, further comprising: If only some of the multiple modules of the chiller unit are operating, and the load of all operating modules is greater than the first threshold, then a second control operation is performed on all operating modules.

9. The control method according to claim 8, wherein, Performing the second control operation on all running modules includes: Perform a load reduction operation on all running modules and start one module.

10. The control method according to claim 8, wherein, Performing the second control operation on all running modules includes: The rate of change of the outlet water temperature of the chiller unit was detected; If the rate of change of the outlet water temperature is greater than or equal to the ninth threshold, maintain the current operating state of all running modules for a predetermined time, and re-detect the rate of change of the outlet water temperature of the chiller unit after the predetermined time; and If the rate of change of the outlet water temperature is less than the ninth threshold, perform a load reduction operation on all operating modules and start one module.

11. The control method according to claim 9 or 10, wherein, Perform a load reduction operation on all running modules to reduce the load of all running modules to the third threshold.

12. The control method according to claim 1, wherein, The third threshold is equal to the first threshold.

13. A control device for a chiller unit, wherein, The chiller unit includes multiple modules, and the control device includes: The acquisition unit is configured to, when all or only some modules of the chiller unit are operating, if at least one module among all operating modules has a load greater than a first threshold and at least one module has a load less than a second threshold, acquire the module with the highest load and the module with the lowest load among all operating modules, wherein the first threshold and the second threshold are both thresholds related to the operating load of the module, and the first threshold is greater than the second threshold. A calculation unit is configured to calculate a first difference between the highest load and a third threshold, and a second difference between the third threshold and the lowest load, wherein the third threshold is the optimal load value for module operation; and An execution control unit is configured to perform a load reduction operation on the module with the highest load and a load operation on the module with the lowest load when at least one of the first difference and the second difference is greater than a fourth threshold and the difference between the highest load and the lowest load is greater than a fifth threshold, wherein the fourth threshold is a threshold related to the first difference and the second difference, and the fifth threshold is a threshold related to the difference between the highest load and the lowest load.

14. A control device for a chiller unit, comprising: Memory; as well as A processor coupled to the memory, the processor being configured to execute the control method as described in any one of claims 1 to 12 based on instructions stored in the memory.

15. A water chiller unit, comprising: The control device as described in claim 13 or 14.

16. The chiller unit according to claim 15, further comprising: Multiple modules, each including a compressor, condenser and evaporator.

17. A computer-readable storage medium having stored thereon computer program instructions that, when executed by a processor, implement the control method as described in any one of claims 1 to 12.

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