Intelligent control method and system for central air conditioning unit

Abstract

The embodiments of this specification provide a central air-conditioning unit intelligent control method and system, which belongs to the field of central air-conditioning control technology. The method includes: in the startup phase, predicting the load of the central air-conditioning unit in the startup phase, and determining and starting the target cooling tower, target refrigeration pump, target cooling pump and target chiller according to the principle of balance priority or efficiency priority; in the operation phase, under normal operation, loading or unloading the cooling tower, refrigeration pump, cooling pump and chiller according to the change of the actual load of the central air-conditioning unit, in a fault state, shutting down the faulty equipment, and determining and starting the replacement equipment for the faulty equipment; in the shutdown phase, shutting down the cooling tower, refrigeration pump, cooling pump and chiller, which has the advantages of reducing air-conditioning energy consumption, avoiding energy waste, and ensuring stable operation of the unit.

Description

Technical Field

[0001] This specification relates to the field of central air-conditioning control, and in particular to an intelligent control method and system for a central air-conditioning unit. Background Art

[0002] Building carbon emissions account for approximately 20% of the total, while central air conditioning energy consumption accounts for approximately 65% ​​of total building energy consumption. In southern China, this proportion rises to approximately 70%. Therefore, the operation of central air conditioning systems plays a vital role in achieving the dual carbon goals. Traditional central air conditioning control relies on empirical mode setting and operation management. Insufficient experience can easily lead to abnormal operating conditions. Moreover, the entire central air conditioning unit is unable to coordinate system operation in real time, and when equipment fails, there is a lack of corresponding control to ensure stable cooling (or heating) supply. This is especially true for some industrial sectors, especially data centers and clean rooms, which can cause serious losses and interruptions to the production process. At the same time, it can also lead to inefficient operation of central air conditioning units, energy waste, and increased carbon emissions.

[0003] Therefore, it is necessary to provide an intelligent control method and system for a central air-conditioning unit to reduce air-conditioning energy consumption, avoid energy waste, and ensure stable operation of the unit. Summary of the Invention

[0004] In order to solve the technical problems in the prior art, one of the embodiments of this specification provides an intelligent control method for a central air-conditioning unit, including: in the startup phase, predicting the load of the central air-conditioning unit in the startup phase, and determining and starting the target cooling tower, target refrigeration pump, target cooling pump and target chiller according to the balance priority principle or the efficiency priority principle; in the operation phase, under normal operation, loading or unloading the cooling tower, refrigeration pump, cooling pump and chiller according to the changes in the actual load of the central air-conditioning unit, in a fault state, shutting down the faulty equipment, and determining and starting the replacement equipment for the faulty equipment; in the shutdown phase, shutting down the cooling tower, refrigeration pump, cooling pump and chiller.

[0005] In some embodiments, according to the balance priority principle, the target cooling tower, target refrigeration pump, target cooling pump and target chiller are determined, including: determining the cumulative operating time of the cooling tower, refrigeration pump, cooling pump and chiller, sorting the cooling tower, refrigeration pump, cooling pump and chiller from small to large according to the cumulative operating time, and determining the target cooling tower, target refrigeration pump, target cooling pump and target chiller according to the first sorting result; according to the efficiency priority principle, the target cooling tower, target refrigeration pump, target cooling pump and target chiller are determined, including: determining the internal efficiency of each chiller, sorting the chillers in order of the internal efficiency from large to small, and determining the target chiller according to the second sorting result; determining the cumulative operating time of the cooling tower, refrigeration pump and cooling pump, sorting the cooling tower, refrigeration pump and cooling pump in order of the cumulative operating time, and determining the target cooling tower, target refrigeration pump and target cooling pump according to the third sorting result.

[0006] In some embodiments, starting the target cooling tower, target refrigeration pump, target cooling pump and target chiller includes: starting the target refrigeration pump, target cooling pump, target cooling tower and target chiller in sequence; wherein, if starting the target refrigeration pump, target cooling pump and / or target cooling tower fails, determining and starting an alternative target refrigeration pump, alternative target cooling pump and / or alternative target cooling tower according to the principle of balance priority; if starting the target chiller fails, determining and starting an alternative target chiller according to the principle of balance priority or the principle of efficiency priority.

[0007] In some embodiments, under normal operating conditions, the cooling tower, refrigeration pump, cooling pump and chiller are loaded according to the change of the actual load of the central air-conditioning unit, including: judging whether loading is required based on the chilled water supply temperature change rate, the chilled water supply temperature, the chilled water supply temperature set value and the average current load rate of the target chiller; when it is judged that loading is required, determining to load the cooling tower, load the refrigeration pump, load the cooling pump and / or load the chiller; starting the loaded refrigeration pump, the loaded cooling pump, the loaded cooling tower and / or the loaded chiller in sequence; wherein, if starting the loaded refrigeration pump, the loaded cooling pump and / or the loaded cooling tower fails, determining and starting an alternative loaded refrigeration pump, an alternative loaded cooling pump and / or an alternative loaded cooling tower according to the principle of balance priority; if starting the loaded chiller fails, determining and starting an alternative loaded chiller according to the principle of balance priority or the principle of efficiency priority.

[0008] In some embodiments, the load shedding of the cooling tower, the refrigeration pump, the cooling pump and the chiller is carried out according to the change of the actual load of the central air-conditioning unit under normal operation, including: the load shedding of the cooling tower, the refrigeration pump, the cooling pump and the chiller according to the balance priority principle or the efficiency priority principle; the load shedding of the cooling tower, the refrigeration pump, the cooling pump and the chiller according to the balance priority principle includes: determining the cumulative operating time of the target cooling tower, the target refrigeration pump, the target cooling pump and the target chiller, sorting the target cooling tower, the target refrigeration pump, the target cooling pump and the target chiller in descending order of the cumulative operating time, and shutting down at least one of the target cooling towers, the target refrigeration pump, the target cooling pump and the target chiller according to the fourth sorting result. Target cooling tower, the target refrigeration pump, the target cooling pump and / or the target chiller; the load shedding of the cooling tower, the refrigeration pump, the cooling pump and the chiller according to the efficiency priority principle, including: determining the internal efficiency of each of the target chillers, sorting the target chillers in ascending order of the internal efficiency, and shutting down at least one target chiller according to a fifth sorting result; and / or determining the cumulative operating time of the target cooling tower, the target refrigeration pump and the target cooling pump, sorting the target cooling tower, the target refrigeration pump and the target cooling pump in descending order of the cumulative operating time, and shutting down at least one of the target cooling tower, the target refrigeration pump and / or the target cooling pump according to a sixth sorting result.

[0009] In some embodiments, the cooling tower, the refrigeration pump, the cooling pump and the chiller are loaded down according to the change in the actual load of the central air-conditioning unit, including: judging whether load reduction is required based on the chilled water supply temperature change rate, the chilled water supply temperature, the chilled water supply temperature set value and the average current load rate of the target chiller; when it is judged that load reduction is required, determining and shutting down the load-reduced cooling tower, the load-reduced refrigeration pump, the load-reduced cooling pump and / or the load-reduced chiller; wherein, if shutting down the load-reduced cooling tower, the load-reduced refrigeration pump, the load-reduced cooling pump and / or the load-reduced chiller fails, an alarm signal is issued and the load reduction is ended.

[0010] One of the embodiments of the present specification provides an intelligent control system for a central air-conditioning unit, including: a monitoring module for obtaining the operating status and operating parameters of the central air-conditioning unit in the startup phase, the operation phase and the shutdown phase; a strategy module for determining the control strategy of the central air-conditioning unit in the startup phase, the operation phase and the shutdown phase based on the operating status and operating parameters of the central air-conditioning unit obtained by the monitoring module in the startup phase, the operation phase and the shutdown phase; and an execution module for executing the control strategy of the central air-conditioning unit in the startup phase, the operation phase and the shutdown phase determined by the strategy module.

[0011] In some embodiments, the monitoring module is also used for: when the central air-conditioning unit is in the startup stage, the monitoring module is used to obtain outdoor temperature and humidity and indoor temperature and humidity; when the central air-conditioning unit is in the operation stage, the monitoring module is used to obtain outdoor temperature and humidity, indoor temperature and humidity, chilled water supply and return water temperature, supply and return water pressure, chilled water flow and cooling water supply and return water temperature, and the monitoring module is also used to obtain the operating status and operating parameters of the cooling tower, freezing pump, cooling pump and chiller; when the central air-conditioning unit is in the shutdown stage, the monitoring module is used to obtain the operating status and operating parameters of the cooling tower, freezing pump, cooling pump and chiller.

[0012] In some embodiments, the strategy module is also used to: during the startup phase, predict the load of the central air-conditioning unit during the startup phase, and determine the target cooling tower, target refrigeration pump, target cooling pump, target chiller and the operating parameters of the target cooling tower, target refrigeration pump, target cooling pump and target chiller according to the balance priority principle or the efficiency priority principle; during the operation phase, when the central air-conditioning unit is operating normally, determine whether to load or unload based on the operating status and operating parameters of the central air-conditioning unit obtained by the monitoring module during the operation phase.

[0013] In some embodiments, the strategy module is also used to: during the operation phase, when it is determined that loading or unloading is required, generate and send a loading strategy or a load unloading strategy to the execution module; during the operation phase, determine the faulty device based on the operating status and operating parameters of the central air-conditioning unit obtained by the monitoring module during the operation phase, and determine the replacement device corresponding to the faulty device, and generate and send a replacement strategy to the execution module. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] This specification will be further described in the form of exemplary embodiments, which will be described in detail with reference to the accompanying drawings. These embodiments are not limiting, and in these embodiments, like numbers represent like structures, wherein:

[0015] Figure 1 This is a schematic diagram of an application scenario of an intelligent control system for a central air-conditioning unit according to some embodiments of this specification;

[0016] Figure 2 This is a module diagram of an intelligent control system for a central air-conditioning unit according to some embodiments of this specification;

[0017] Figure 3 is an exemplary flow chart of a central air-conditioning unit intelligent control method according to some embodiments of this specification;

[0018] Figure 4 It is a timing diagram of the intelligent control method of a central air-conditioning unit according to some embodiments of this specification.

[0019] In the figure, 110 is a processing device; 120 is a network; 130 is a user terminal; and 140 is a storage device. DETAILED DESCRIPTION

[0020] To more clearly illustrate the technical solutions of the embodiments of this specification, the following briefly describes the drawings required for describing the embodiments. Obviously, the drawings described below are merely examples or embodiments of this specification. Those skilled in the art can apply this specification to other similar scenarios based on these drawings without inventive effort. Unless otherwise apparent from the context or otherwise noted, the same reference numerals in the figures represent the same structure or operation.

[0021] It should be understood that the terms "system," "device," "unit," and / or "module" used herein are a method for distinguishing different components, elements, parts, portions, or assemblies at different levels. However, if other terms can achieve the same purpose, the terms may be replaced by other expressions.

[0022] As used in this specification and claims, unless the context clearly indicates otherwise, the words "a," "an," "an," and / or "the" do not refer to the singular but also include the plural. Generally speaking, the terms "comprises" and "include" only indicate the inclusion of the steps and elements specifically identified, and these steps and elements do not constitute an exclusive list. A method or apparatus may also include other steps or elements.

[0023] Flowcharts are used throughout this specification to illustrate the operations performed by systems according to embodiments of this specification. It should be understood that preceding or following operations do not necessarily need to be performed in exact order. Instead, the steps may be processed in reverse order or simultaneously. Furthermore, other operations may be added to these processes, or one or more operations may be removed from these processes.

[0024] Figure 1 This is a schematic diagram of an application scenario of an intelligent control system for a central air-conditioning unit according to some embodiments of this specification.

[0025] like Figure 1 As shown, the application scenario may include a processing device 110 , a network 120 , a user terminal 130 , a storage device 140 and a central air conditioning unit 150 .

[0026] In some embodiments, the processing device 110 can be used to process information and / or data related to strain monitoring during the construction period of steel structure buildings. For example, the processing device 110 can be used to predict the load of the central air-conditioning unit during the startup phase, and determine and start the target cooling tower, target refrigeration pump, target cooling pump and target chiller according to the principle of balance priority or efficiency priority; in the operation phase, under normal operation, the cooling tower, refrigeration pump, cooling pump and chiller are loaded or unloaded according to the actual load changes of the central air-conditioning unit, in a fault state, the faulty equipment is turned off, and the replacement equipment for the faulty equipment is determined and turned on; in the shutdown phase, the cooling tower, refrigeration pump, cooling pump and chiller are turned off. For more descriptions of the processing device 110, please refer to the descriptions in other parts of this application. For example, Figure 3 and its description.

[0027] In some embodiments, processing device 110 may be regional or remote. For example, processing device 110 may access information and / or data stored in user terminal 130 and storage device 140 via network 120. In some embodiments, processing device 110 may directly connect to user terminal 130 and storage device 140 to access the information and / or data stored therein. In some embodiments, processing device 110 may be executed on a cloud platform. For example, the cloud platform may include one or any combination of a private cloud, a public cloud, a hybrid cloud, a community cloud, a decentralized cloud, an internal cloud, and the like.

[0028] In some embodiments, the processing device 110 may include a processor 210, which may include one or more sub-processors (e.g., a single-core processing device or a multi-core multi-core processing device). By way of example only, the processor may include a central processing unit (CPU), an application-specific integrated circuit (ASIC), an application-specific instruction set processor (ASIP), a graphics processing unit (GPU), a physical processing unit (PPU), a digital signal processor (DSP), a field-programmable gate array (FPGA), a programmable logic device (PLD), a controller, a microcontroller unit, a reduced instruction set computer (RISC), a microprocessor, or any combination thereof.

[0029] The network 120 can facilitate the exchange of data and / or information in the application scenario. In some embodiments, one or more components in the application scenario (e.g., the processing device 110, the user terminal 130, and the storage device 140) can send data and / or information to other components in the application scenario via the network 120. For example, the processing device 110 can obtain strain data of the steel structure to be monitored during at least one historical construction period from the storage device 140 via the network 120. In some embodiments, the network 120 can be any type of wired or wireless network. For example, the network 120 can include a cable network, a wired network, a fiber optic network, a telecommunications network, an intranet, an internet network, a local area network (LAN), a Bluetooth network, a ZigBee network, a near field communication (NFC) network, or any combination thereof.

[0030] In some embodiments, user terminal 130 can obtain information or data in an application scenario. For example, user terminal 130 can send a startup command to processing device 110 via network 120. Processing device 110 can predict the load of the central air conditioning unit during the startup phase based on the startup command and determine and start the target cooling tower, target refrigeration pump, target cooling pump, and target chiller according to the principle of balance priority or efficiency priority. In some embodiments, user terminal 130 can include one or any combination of a mobile device (e.g., a smartphone, smartwatch, etc.), a tablet computer, a laptop computer, etc.

[0031] In some embodiments, storage device 140 can be connected to network 120 to enable communication with one or more components of the application scenario (e.g., processing device 110, user terminal 130, etc.). One or more components of the application scenario can access data or instructions stored in storage device 140 via network 120. In some embodiments, storage device 140 can be directly connected to or communicate with one or more components of the application scenario (e.g., processing device 110, user terminal 130). In some embodiments, storage device 140 can be part of processing device 110.

[0032] The central air conditioning unit 150 may include at least one cooling tower, a freezing pump, a cooling pump and a chiller. The central air conditioning unit 150 may also include other equipment, such as a water valve arranged on the freezing side of the chiller, a water valve arranged on the cooling side of the chiller, etc.

[0033] It should be noted that the above description is provided for illustrative purposes only and is not intended to limit the scope of the present application. For those skilled in the art, various changes and modifications can be made under the guidance of the contents of this application. The features, structures, methods and other features of the exemplary embodiments described in this application can be combined in various ways to obtain additional and / or alternative exemplary embodiments. For example, the storage device 140 can be a data storage device including a cloud computing platform, such as a public cloud, a private cloud, a community and a hybrid cloud. However, these changes and modifications will not deviate from the scope of the present application.

[0034] Figure 2 This is a module diagram of an intelligent control system for a central air-conditioning unit according to some embodiments of this specification.

[0035] like Figure 2 As shown, an intelligent control system for a central air-conditioning unit may include a monitoring module, a strategy module and an execution module.

[0036] The monitoring module can be used to obtain the operating status and operating parameters of the central air-conditioning unit during the startup phase, the operation phase, and the shutdown phase. In some embodiments, the monitoring module is further used to: when the central air-conditioning unit is in the startup phase, the monitoring module is used to obtain the outdoor temperature and humidity and the indoor temperature and humidity; when the central air-conditioning unit is in the operation phase, the monitoring module is used to obtain the outdoor temperature and humidity, the indoor temperature and humidity, the chilled water supply and return water temperature, the supply and return water pressure, the chilled water flow rate, and the cooling water supply and return water temperature; the monitoring module is also used to obtain the operating status and operating parameters of the cooling tower, the refrigeration pump, the cooling pump, and the chiller; when the central air-conditioning unit is in the shutdown phase, the monitoring module is used to obtain the operating status and operating parameters of the cooling tower, the refrigeration pump, the cooling pump, and the chiller.

[0037] The strategy module can be used to determine the control strategy of the central air conditioning unit during the startup phase, the operation phase, and the shutdown phase based on the operating status and operating parameters of the central air conditioning unit obtained by the monitoring module during the startup phase, the operation phase, and the shutdown phase. In some embodiments, the strategy module is further used to: during the startup phase, predict the load of the central air conditioning unit during the startup phase, and determine the target cooling tower, target refrigeration pump, target cooling pump, target chiller, and target cooling tower, target refrigeration pump, target cooling pump, and target chiller operating parameters according to the principle of balance priority or efficiency priority; during the operation phase, when the central air conditioning unit is operating normally, determine whether to load or unload based on the operating status and operating parameters of the central air conditioning unit obtained by the monitoring module during the operation phase. In some embodiments, the strategy module is further used to: during the operation phase, when it is determined that loading or unloading is required, generate and send a loading strategy or a load unloading strategy to the execution module; during the operation phase, determine a faulty device based on the operating status and operating parameters of the central air conditioning unit obtained by the monitoring module during the operation phase, determine a replacement device corresponding to the faulty device, and generate and send a replacement strategy to the execution module.

[0038] The execution module can be used to execute the control strategy of the central air-conditioning unit in the startup phase, operation phase and shutdown phase determined by the strategy module.

[0039] For more information about the monitoring module, policy module, and execution module, see Figure 3 The related descriptions will not be repeated here.

[0040] It should be noted that the above description of the candidate item display and determination system and its modules is for convenience of description only and does not limit this specification to the scope of the embodiments. It is understandable that those skilled in the art, after understanding the principles of the system, may arbitrarily combine the modules or form subsystems connected with other modules without deviating from the principles. In some embodiments, Figure 2 The monitoring module, policy module, and execution module disclosed herein may be separate modules within a system, or a single module may implement the functions of two or more of the aforementioned modules. For example, the modules may share a storage module, or each module may have its own storage module. Such variations are within the scope of this specification.

[0041] Figure 3 This is an exemplary flow chart of a central air-conditioning unit intelligent control method according to some embodiments of this specification. Figure 3 As shown, a central air conditioning unit intelligent control method includes the following steps: In some embodiments, a central air conditioning unit intelligent control method can be executed by a central air conditioning unit intelligent control system or processing device 110 .

[0042] Step 310 , during the startup phase, predict the load of the central air-conditioning unit during the startup phase, and determine and start the target cooling tower, target refrigeration pump, target cooling pump, and target chiller according to the principle of balance priority or efficiency priority.

[0043] In some embodiments, the policy module can predict the load of the central air-conditioning unit during the startup phase by any means. For example, the policy module can predict the load of the central air-conditioning unit during the startup phase by using relevant data. As an example only, the policy module can predict the load of the central air-conditioning unit during the startup phase based on historical data using a machine learning model, wherein the historical data can be the load of the central air-conditioning unit during the startup phase at multiple historical time points, and the machine learning model can include but is not limited to one or more combinations of neural networks (NN), decision trees (DT), linear regression (LR), etc.

[0044] In some embodiments, the policy module may also directly obtain the predicted load of the central air-conditioning unit during the startup phase from the processing device 110 , the user terminal 130 , the storage device 140 and / or an external data source.

[0045] The strategy module can determine the number of devices that need to be turned on based on the predicted load of the central air-conditioning unit during the startup phase, that is, the number of cooling towers, freezing pumps, cooling pumps and chillers that need to be turned on.

[0046] The principle of balance priority means making the cumulative operating time of each device in the central air-conditioning unit close.

[0047] In some embodiments, the strategy module can determine the target cooling tower, target refrigeration pump, target cooling pump and target chiller according to the principle of balance priority, specifically including: determining the cumulative operating time of the cooling tower, refrigeration pump, cooling pump and chiller, sorting the cooling tower, refrigeration pump, cooling pump and chiller from small to large according to the cumulative operating time, and determining the target cooling tower, target refrigeration pump, target cooling pump and target chiller according to the first sorting result.

[0048] For example, when the number of cooling towers, freezing pumps, cooling pumps and chillers that need to be turned on is 1, the cooling towers, freezing pumps, cooling pumps and chillers with the least cumulative running time can be used as the target cooling towers, target freezing pumps, target cooling pumps and target chillers. For another example, when the number of cooling towers, freezing pumps, cooling pumps and chillers that need to be turned on is not 1, the strategy module can, according to the first sorting result, select the cooling towers, freezing pumps, cooling pumps and chillers that are ranked higher as the target cooling towers, target freezing pumps, target cooling pumps and target chillers. For example only, when the number of chillers to be turned on is 2, the two chillers that are ranked highest can be selected as the two target chillers according to the first sorting result.

[0049] The efficiency priority principle means that the operating efficiency of the chiller is prioritized.

[0050] In some embodiments, the strategy module can determine the target cooling tower, target refrigeration pump, target cooling pump and target chiller according to the efficiency priority principle, specifically including: determining the internal efficiency of each chiller, sorting the chillers in order of internal efficiency from large to small, determining the target chiller according to the second sorting result, determining the cumulative operating time of the cooling tower, refrigeration pump and cooling pump, sorting the cooling tower, refrigeration pump and cooling pump in order of cumulative operating time from small to large, and determining the target cooling tower, target refrigeration pump and target cooling pump according to the third sorting result.

[0051] For example, when the number of chillers to be activated is one, the policy module may select the chiller with the highest internal efficiency as the target cooling tower. For another example, when the number of chillers to be activated is not one, the policy module may select the chiller with the highest ranking as the target chiller based on the second sorting result. For example, when the number of chillers to be activated is two, the policy module may select the two chillers with the highest ranking as the two target chillers based on the second sorting result.

[0052] In some embodiments, the strategy module can determine the internal efficiency of each chiller in any manner. For example, the strategy module can determine the number of chillers N and the part load rate PLR ​​required to be run based on the predicted load CL during the startup phase and the nominal cooling capacity Cap of each chiller, and calculate the internal efficiency COP of each chiller based on the part load rate using the following formula: int :

[0053] COP int =C0+C1·PLR+C2·PLR 2 +C3·PLR 3 ;

[0054] Where PLR ​​(part load ratio) is the partial load ratio, and C0-C3 are training parameters.

[0055] In some embodiments, after the strategy module determines the target cooling tower, target refrigeration pump, target cooling pump and target chiller, it can send a control instruction to the execution module, and the execution module can start the target cooling tower, target refrigeration pump, target cooling pump and target chiller according to the control instruction.

[0056] In some embodiments, the policy module may determine in any manner whether to prioritize the balance or the efficiency and determine and activate the target cooling tower, target refrigeration pump, target cooling pump, and target chiller. For example, the policy module may directly obtain instructions from the processing device 110, the user terminal 130, the storage device 140, and / or an external data source, and the instructions may instruct the policy module to determine and activate the target cooling tower, target refrigeration pump, target cooling pump, and target chiller according to the balance or the efficiency.

[0057] In some embodiments, the execution module activates the target cooling tower, the target refrigeration pump, the target cooling pump, and the target chiller, which may specifically include sequentially activating the target refrigeration pump, the target cooling pump, the target cooling tower, and the target chiller. For example, the execution module first activates the water valve on the freezing side of the target chiller, then activates the target refrigeration pump; then activates the water valve on the cooling side of the target chiller, then activates the target cooling pump, and finally activates the target cooling tower; and after the aforementioned devices are successfully activated, the target chiller is activated.

[0058] In some embodiments, during the startup phase, the cooling tower, refrigeration pump, cooling pump and chiller to be turned on are selected and turned on according to the priority of balance or operation efficiency, as well as the load forecast of the startup phase; if during the startup process, the equipment (cooling tower, refrigeration pump, cooling pump and chiller) fails to start, the cooling tower, refrigeration pump, cooling pump and chiller are reselected and turned on according to the principle of priority of balance or operation efficiency.

[0059] If, in the process of sequentially opening the target freezing pump, the target cooling pump, the target cooling tower and the target chiller, the water valve on the freezing side or the water valve on the cooling side fails to open, the execution module sends an alarm signal, the strategy module determines an alternative target cooling tower according to the principle of balance priority or the principle of efficiency priority, and the execution module opens the water valve on the freezing side or the water valve on the cooling side of the alternative target cooling tower; if the water valve on the freezing side or the water valve on the cooling side of the alternative target cooling tower fails to open, the execution module sends an alarm signal and determines a second alternative target cooling tower again according to the principle of balance priority or the principle of efficiency priority, and the execution module opens the water valve on the freezing side or the water valve on the cooling side of the second alternative target cooling tower, and so on, until the water valve on the freezing side or the water valve on the cooling side of a certain alternative target cooling tower is successfully opened;

[0060] If, in the above process, the target freezing pump or the target cooling pump fails to start, an alarm signal is issued, the strategy module determines an alternative target freezing pump or an alternative target cooling pump according to the principle of balance priority, and the execution module starts the alternative target freezing pump or the alternative target cooling pump. If the alternative target freezing pump or the alternative target cooling pump fails to start, the execution module issues an alarm signal and determines a second alternative target freezing pump or an alternative target cooling pump again according to the principle of balance priority, and the execution module starts the second alternative target freezing pump or the alternative target cooling pump, and so on, until an alternative target freezing pump or an alternative target cooling pump is successfully started;

[0061] If the target cooling tower fails to start in the above process, an alarm signal is issued, and an alternative target cooling tower is selected according to the selection process of the balance priority principle. The execution module starts the alternative target cooling tower. If the alternative target cooling tower fails to start, the execution module sends an alarm signal and determines the second alternative target cooling tower again according to the balance priority principle. The execution module starts the second alternative target cooling tower. This cycle is repeated until an alternative target cooling tower is successfully started.

[0062] If in the above process, the target chiller fails to start, an alarm signal is issued, and an alternative target chiller is determined according to the balance priority principle or the efficiency priority principle, and the execution module starts the alternative target chiller. If the alternative target chiller fails to start, the execution module sends an alarm signal and determines the second alternative target chiller again according to the balance priority principle or the efficiency priority principle, and the execution module starts the second alternative target chiller. This cycle is repeated until an alternative target chiller is successfully started.

[0063] In some embodiments, if the equipment (cooling tower, refrigeration pump, cooling pump and chiller) fails to start during the startup process, the cooling tower, refrigeration pump, cooling pump and chiller are reselected and started according to the principle of balance priority or operation efficiency priority, thereby ensuring the effective startup of the central air-conditioning unit.

[0064] Step 320, during the operation phase, under normal operating conditions, the cooling tower, refrigeration pump, cooling pump and chiller are loaded or unloaded according to the actual load changes of the central air-conditioning unit. In a fault state, the faulty equipment is turned off, and a replacement device for the faulty equipment is determined and turned on.

[0065] During the operation phase, during normal operation, the increase in actual cooling capacity will affect the chilled water supply temperature T CHWS , Chilled water supply temperature setting value T CHWS，SET , the rate of change of the chilled water supply temperature ΔT CHWS / min, current load rate of chiller AMPS PER .

[0066] In some embodiments, in a normal operating state, loading of the cooling tower, the refrigeration pump, the cooling pump, and the chiller is performed according to the actual load change of the central air conditioning unit, including:

[0067] Determine whether loading is required based on the chilled water supply temperature change rate, chilled water supply temperature, chilled water supply temperature setpoint, and the average current load rate of the target chiller.

[0068] In some embodiments, when the average current load rate of the chiller is greater than 90% to 95%, the chilled water supply temperature change rate is less than 0.3 to 1°C / min, and T CHWS -T CHWS，SET >0.3~0.5, according to the monitoring frequency of every 1~3 minutes, if the above three conditions are met for 10 times cumulatively, the strategy module can determine that loading is required.

[0069] In some embodiments, when it is determined that loading is required, it is determined to load the cooling tower, load the refrigeration pump, load the cooling pump, and / or load the chiller;

[0070] Start loading the refrigeration pump, loading the cooling pump, loading the cooling tower and / or loading the chiller in sequence;

[0071] If the loading refrigeration pump, loading cooling pump and / or loading cooling tower fail to be started, an alternative loading refrigeration pump, an alternative loading cooling pump and / or an alternative loading cooling tower are determined and started according to the principle of balance priority;

[0072] If the loading chiller fails to start, the alternative loading chiller is determined and started according to the balance priority principle or efficiency priority principle.

[0073] In some embodiments, the strategy module can first determine the number of cooling towers, freezing pumps, cooling pumps and chillers that need to be loaded based on the chilled water supply temperature change rate, the chilled water supply temperature, the chilled water supply temperature set value and the average current load rate of the target chiller, and then determine to load the freezing pump, load the cooling pump, load the cooling tower based on the principle of balance priority, and determine to load the chiller based on the principle of balance priority or the principle of efficiency priority.

[0074] During the normal operation of the chiller, the reduction in actual cooling capacity will affect the chilled water supply temperature T CHWS , Chilled water supply temperature setting value T CHWS，SET , current load rate of chiller AMPS PER .

[0075] In some embodiments, under normal operating conditions, load shedding of the cooling tower, the refrigeration pump, the cooling pump, and the chiller is performed according to the actual load change of the central air conditioning unit, including:

[0076] Determine whether load shedding is necessary based on the chilled water supply temperature change rate, chilled water supply temperature, chilled water supply temperature setpoint, and the average current load factor of the target chiller.

[0077] In some embodiments, when the number of running chillers is greater than 1, the average current load rate of the chillers is less than 65% to 69%, and T CHWS，SET -T CHWS >0.3~0.5, according to the monitoring frequency of every 1~3 minutes, if the above three conditions are met for 10 times cumulatively, the strategy module can determine that load shedding is needed.

[0078] In some embodiments, when determining that load reduction is required, the strategy module may first determine the number of cooling towers, refrigeration pumps, cooling pumps and / or chillers that need to be reduced in load, and then determine the reduced-load cooling towers, reduced-load refrigeration pumps, reduced-load cooling pumps and / or reduced-load chillers from the operating cooling towers, refrigeration pumps, cooling pumps and chillers based on the number of cooling towers, refrigeration pumps, cooling pumps and / or chillers that need to be reduced in load.

[0079] In some embodiments, if shutting down the load-shedding cooling tower, the load-shedding refrigeration pump, the load-shedding cooling pump, and / or the load-shedding chiller fails, an alarm signal is issued and the load-shedding is terminated.

[0080] In some embodiments, under normal operating conditions, load shedding of the cooling tower, the refrigeration pump, the cooling pump, and the chiller is performed according to the actual load change of the central air conditioning unit, including:

[0081] Reduce the load of cooling towers, refrigeration pumps, cooling pumps and chillers according to the principle of balance priority or efficiency priority;

[0082] The cooling tower, refrigeration pump, cooling pump and chiller are unloaded according to the principle of balance priority, including:

[0083] determining cumulative operating time of the target cooling tower, the target refrigeration pump, the target cooling pump, and the target chiller, sorting the target cooling tower, the target refrigeration pump, the target cooling pump, and the target chiller in descending order of cumulative operating time, and shutting down at least one of the target cooling tower, the target refrigeration pump, the target cooling pump, and / or the target chiller according to a fourth sorting result;

[0084] In accordance with the principle of efficiency first, reduce the load of cooling towers, refrigeration pumps, cooling pumps and chillers, including:

[0085] Determine the internal efficiency of each target chiller, sort the target chillers in ascending order of internal efficiency, and shut down at least one target chiller according to a fifth sorting result; and / or,

[0086] Determine the cumulative operating time of the target cooling tower, target refrigeration pump and target cooling pump, sort the target cooling tower, target refrigeration pump and target cooling pump in descending order of the cumulative operating time, and shut down at least one target cooling tower, target refrigeration pump and / or target cooling pump according to the sixth sorting result.

[0087] Specifically, according to the principle of balance priority, the strategy module can start shutting down the equipment with the longest cumulative operating time (including chillers, cooling pumps, freezing pumps, and cooling towers); if multiple chillers are involved, they will be shut down in descending order of cumulative operating time;

[0088] According to the efficiency priority principle, the strategy module can obtain the internal efficiency COP of each chiller in operation based on the actual partial load rate. int , shut down the chiller with the lowest internal efficiency in operation; if it involves shutting down multiple chillers, open them in the order of internal efficiency from small to large; the remaining equipment (including cooling pumps, freezing pumps, cooling towers) are still shut down according to the rule of balance priority.

[0089] In some embodiments, after determining the load reduction of the cooling tower, the load reduction of the refrigeration pump, the load reduction of the cooling pump and / or the load reduction of the chiller, the execution module can first shut down the load reduction chiller, then shut down the load reduction of the refrigeration pump, and then shut down the water valve and cooling pump on the freezing side of the load reduction chiller, and then shut down the cooling tower, and then close the water valve on the cooling side of the load reduction chiller.

[0090] If during the load shedding process, if the chiller fails to shut down, an alarm signal will be issued to end the load shedding process;

[0091] If during the load shedding process, if the load shedding refrigeration pump or load shedding cooling pump fails to shut down, an alarm signal will be issued to end the load shedding process;

[0092] If the cooling tower fails to shut down during the load shedding process, an alarm signal will be issued to end the load shedding process;

[0093] If during the load shedding process, the water valve on the freezing side of the load shedding chiller or the cooling side of the load shedding chiller fails to close, an alarm signal will be issued to end the load shedding process.

[0094] like Figure 4 As shown, during the operation phase, if equipment (cooling tower, refrigeration pump, cooling pump and chiller) fails, alternative equipment can be reselected to replace the failed equipment based on the principle of balance priority or operation efficiency priority.

[0095] In some embodiments, during the operation phase, if the operating freezing pump or cooling pump fails, an alarm signal is issued, the strategy module determines an alternative freezing pump or alternative cooling pump according to the principle of balance priority, the execution module starts the alternative freezing pump or alternative cooling pump, and shuts down the failed freezing pump or cooling pump; if the alternative freezing pump or alternative cooling pump fails to start, the execution module issues an alarm signal and again determines a second alternative freezing pump or alternative cooling pump according to the principle of balance priority, the execution module starts the second alternative freezing pump or alternative cooling pump, and the cycle continues until an alternative freezing pump or alternative cooling pump is successfully started;

[0096] In some embodiments, during the operation stage, if the running cooling tower fails, an alarm signal is issued, and an alternative cooling tower is selected according to the selection process of the balance priority principle. The execution module turns on the alternative cooling tower and turns off the faulty cooling tower. If the alternative cooling tower fails to start, the execution module sends an alarm signal and determines the second alternative cooling tower again according to the balance priority principle. The execution module turns on the second alternative cooling tower, and the cycle continues until an alternative cooling tower is successfully turned on.

[0097] In some embodiments, during the operation stage, if the running chiller fails to start, an alarm signal is issued, and an alternative chiller is determined according to the principle of balance priority or efficiency priority. The execution module starts the alternative chiller and shuts down the faulty chiller. If the alternative chiller fails to start, the execution module issues an alarm signal and determines a second alternative chiller again according to the principle of balance priority or efficiency priority. The execution module starts the second alternative chiller, and the cycle continues until an alternative chiller is successfully started.

[0098] In some embodiments, during the operation stage, when equipment (cooling tower, refrigeration pump, cooling pump and chiller) fails, the cooling tower, refrigeration pump, cooling pump and / or chiller are reselected and turned on according to the principle of balance priority or operation efficiency priority to ensure the normal operation of the central air-conditioning unit.

[0099] Step 330, during the shutdown phase, shut down the cooling tower, the freezing pump, the cooling pump, and the chiller.

[0100] First turn off the chiller; then turn off the refrigeration pump, and then close the water valve on the refrigeration side; at the same time, turn off the cooling pump, then turn off the cooling tower, and then close the water valve on the cooling side.

[0101] If the chiller fails to shut down during the shutdown process, an alarm signal will be issued to end the shutdown process;

[0102] If the freezing pump or cooling pump fails to shut down during the shutdown process, an alarm signal will be issued to end the shutdown process;

[0103] If the cooling tower fails to shut down during the shutdown process, an alarm signal will be issued to end the shutdown process;

[0104] If the water valve on the freezing side or the water valve on the cooling side fails to close during the closing process, an alarm signal will be issued to end the closing process.

[0105] The intelligent control method and system for a central air-conditioning unit provided in the embodiments of this specification combine the predicted load, actual load, and the three stages of startup, operation, and shutdown of the central air-conditioning unit to achieve a dynamic balance between the load and the cooling capacity of the air-conditioning unit and intelligent control of the unit, thereby ensuring the stability of the cooling or heating supply of the central air-conditioning unit and achieving the purpose of on-demand cooling or heating and energy saving.

[0106] It should be noted that the above description of a central air conditioning unit intelligent control method is for illustrative purposes only and does not limit the scope of application of this specification. Those skilled in the art will appreciate the guidance of this specification and the various modifications and alterations that may be made to the central air conditioning unit intelligent control method. However, such modifications and alterations remain within the scope of this specification.

[0107] While the basic concepts have been described above, it will be apparent to those skilled in the art that the detailed disclosure is merely illustrative and does not limit this specification. Although not explicitly stated herein, various modifications, improvements, and revisions to this specification may be made by those skilled in the art. Such modifications, improvements, and revisions are suggested in this specification and remain within the spirit and scope of the exemplary embodiments of this specification.

[0108] This specification also uses specific terms to describe the embodiments of this specification. For example, "one embodiment," "an embodiment," and / or "some embodiments" refer to a feature, structure, or characteristic associated with at least one embodiment of this specification. Therefore, it should be emphasized and noted that references to "one embodiment," "an embodiment," or "an alternative embodiment" two or more times in different locations in this specification do not necessarily refer to the same embodiment. Furthermore, certain features, structures, or characteristics of one or more embodiments of this specification may be appropriately combined.

[0109] In addition, unless expressly stated in the claims, the order of the processing elements and sequences, the use of alphanumeric characters, or the use of other names described in this specification are not intended to limit the order of the processes and methods of this specification. Although the above disclosure discusses some of the invention embodiments currently considered useful through various examples, it should be understood that such details are for illustrative purposes only, and the appended claims are not limited to the disclosed embodiments. On the contrary, the claims are intended to cover all modifications and equivalent combinations that are consistent with the spirit and scope of the embodiments of this specification. For example, although the system components described above can be implemented by hardware devices, they can also be implemented only by software solutions, such as installing the described system on an existing server or mobile device.

[0110] Similarly, it should be noted that, in order to simplify the presentation of this specification and thus facilitate understanding of one or more embodiments of the invention, the foregoing descriptions of the embodiments of this specification sometimes combine multiple features into a single embodiment, figure, or description thereof. However, this disclosure method does not imply that the subject matter of this specification requires more features than those recited in the claims. In fact, an embodiment may have fewer features than all of the features of a single disclosed embodiment.

[0111] Finally, it should be understood that the embodiments described in this specification are intended only to illustrate the principles of the embodiments of this specification. Other variations may also fall within the scope of this specification. Therefore, by way of example and not limitation, alternative configurations of the embodiments of this specification may be considered consistent with the teachings of this specification. Accordingly, the embodiments of this specification are not limited to the embodiments explicitly described and illustrated in this specification.

Claims

1. A central air-conditioning unit intelligent control method, characterized in that: include: During the startup phase, the load of the central air-conditioning unit is predicted, and according to the principle of balance priority or efficiency priority, a target cooling tower, a target refrigeration pump, a target cooling pump, and a target chiller are determined and started; During the operation phase, under normal operating conditions, the cooling tower, refrigeration pump, cooling pump, and chiller are loaded or unloaded according to the actual load changes of the central air-conditioning unit. In the event of a fault, the faulty equipment is shut down and a replacement equipment for the faulty equipment is determined and turned on. During the shutdown phase, shut down the cooling tower, refrigeration pump, cooling pump and chiller; According to the principle of balance priority, the target cooling tower, target refrigeration pump, target cooling pump and target chiller are determined, including: Determining the cumulative operating time of a cooling tower, a freezing pump, a cooling pump, and a chiller, sorting the cooling tower, the freezing pump, the cooling pump, and the chiller in ascending order according to the cumulative operating time, and determining the target cooling tower, the target freezing pump, the target cooling pump, and the target chiller based on a first sorting result; According to the efficiency priority principle, the target cooling tower, target refrigeration pump, target cooling pump and target chiller are determined, including: determining an internal efficiency of each chiller, sorting the chillers in descending order of the internal efficiency, and determining the target chiller according to a second sorting result; Determine the cumulative operating time of the cooling tower, the freezing pump and the cooling pump, sort the cooling tower, the freezing pump and the cooling pump in ascending order of the cumulative operating time, and determine the target cooling tower, the target freezing pump and the target cooling pump based on the third sorting result.

2. The intelligent control method for a central air-conditioning unit according to claim 1, characterized in that: Turning on the target cooling tower, the target refrigeration pump, the target cooling pump, and the target chiller comprises: Turning on the target freezing pump, the target cooling pump, the target cooling tower and the target chiller in sequence; If the target refrigeration pump, the target cooling pump and / or the target cooling tower fail to be started, an alternative target refrigeration pump, an alternative target cooling pump and / or an alternative target cooling tower are determined and started according to the principle of balance priority; If starting the target chiller fails, an alternative target chiller is determined and started according to the balance priority principle or the efficiency priority principle.

3. A central air conditioning unit intelligent control method according to claim 1 or 2, characterized in that: The process of loading the cooling tower, the refrigeration pump, the cooling pump, and the chiller according to the actual load change of the central air-conditioning unit under normal operation includes: Determining whether loading is required based on the chilled water supply temperature change rate, the chilled water supply temperature, the chilled water supply temperature set value, and the average current load rate of the target chiller; When it is determined that loading is required, determining to load the cooling tower, load the refrigeration pump, load the cooling pump and / or load the chiller; Start the loading refrigeration pump, the loading cooling pump, the loading cooling tower and / or the loading chiller in sequence; If the loading refrigeration pump, the loading cooling pump and / or the loading cooling tower fail to be started, an alternative loading refrigeration pump, an alternative loading cooling pump and / or an alternative loading cooling tower are determined and started according to the principle of balance priority; If starting the loading chiller fails, an alternative loading chiller is determined and started according to the balance priority principle or the efficiency priority principle.

4. A central air conditioning unit intelligent control method according to claim 1 or 2, characterized in that: The process of reducing the load of the cooling tower, the refrigeration pump, the cooling pump and the chiller according to the actual load change of the central air-conditioning unit under normal operation includes: Reduce the load of cooling towers, refrigeration pumps, cooling pumps, and chillers according to the balance priority principle or the efficiency priority principle; The load shedding of the cooling tower, the refrigeration pump, the cooling pump and the chiller according to the principle of balance priority includes: determining the cumulative operating time of the target cooling tower, the target freezing pump, the target cooling pump, and the target chiller, sorting the target cooling tower, the target freezing pump, the target cooling pump, and the target chiller in descending order of the cumulative operating time, and shutting down at least one of the target cooling tower, the target freezing pump, the target cooling pump, and / or the target chiller according to a fourth sorting result; The load shedding of the cooling tower, the refrigeration pump, the cooling pump and the chiller according to the efficiency priority principle includes: Determining the internal efficiency of each of the target chillers, sorting the target chillers in ascending order of the internal efficiency, and shutting down at least one target chiller according to a fifth sorting result; and / or, Determine the cumulative operating time of the target cooling tower, the target refrigeration pump and the target cooling pump, sort the target cooling tower, the target refrigeration pump and the target cooling pump in descending order of the cumulative operating time, and shut down at least one of the target cooling tower, the target refrigeration pump and / or the target cooling pump according to the sixth sorting result.

5. The intelligent control method for a central air-conditioning unit according to claim 4, characterized in that: The process of reducing the load of the cooling tower, the refrigeration pump, the cooling pump and the chiller according to the actual load change of the central air-conditioning unit under normal operation includes: Determine whether load shedding is required based on the chilled water supply temperature change rate, the chilled water supply temperature, the chilled water supply temperature setpoint, and the average current load rate of the target chiller: When load shedding is determined to be necessary, determine and shut down the load-shedding cooling tower, load-shedding refrigeration pump, load-shedding cooling pump and / or load-shedding chiller; If shutting down the load-reducing cooling tower, the load-reducing refrigeration pump, the load-reducing cooling pump and / or the load-reducing chiller fails, an alarm signal is issued and the load-reducing is terminated.

6. An intelligent control system for a central air-conditioning unit, characterized in that: A method for intelligently controlling a central air-conditioning unit according to any one of claims 1 to 5, comprising: A monitoring module, configured to obtain the operating status and operating parameters of the central air-conditioning unit during the startup phase, operation phase, and shutdown phase; a strategy module for determining a control strategy for the central air-conditioning unit in the startup phase, the operation phase, and the shutdown phase based on the operating status and operating parameters of the central air-conditioning unit acquired by the monitoring module in the startup phase, the operation phase, and the shutdown phase; An execution module is used to execute the control strategy of the central air-conditioning unit in the startup phase, the operation phase and the shutdown phase determined by the strategy module.

7. The intelligent control system for a central air-conditioning unit according to claim 6, characterized in that: The monitoring module is also used for: When the central air-conditioning unit is in the startup stage, the monitoring module is used to obtain outdoor temperature and humidity and indoor temperature and humidity; When the central air-conditioning unit is in the operating stage, the monitoring module is used to obtain outdoor temperature and humidity, indoor temperature and humidity, chilled water supply and return water temperature, supply and return water pressure, chilled water flow rate and cooling water supply and return water temperature. The monitoring module is also used to obtain the operating status and operating parameters of the cooling tower, freezing pump, cooling pump and chiller; When the central air-conditioning unit is in the shutdown stage, the monitoring module is used to obtain the operating status and operating parameters of the cooling tower, the freezing pump, the cooling pump and the chiller.

8. The intelligent control system for a central air-conditioning unit according to claim 6, characterized in that: The policy module is also used to: During the startup phase, the load of the central air-conditioning unit is predicted, and the operating parameters of the target cooling tower, target refrigeration pump, target cooling pump, target chiller, and the target cooling tower, target refrigeration pump, target cooling pump, and target chiller are determined according to a principle of balance priority or an principle of efficiency priority; During the operation phase, when the central air-conditioning unit is operating normally, whether to load or unload is determined based on the operating status and operating parameters of the central air-conditioning unit obtained by the monitoring module during the operation phase.

9. The intelligent control system for a central air-conditioning unit according to claim 6, characterized in that: The policy module is also used to: During the operation phase, when it is determined that loading or unloading is required, generating and sending a loading strategy or unloading strategy refers to the execution module; During the operation phase, the faulty device is determined based on the operating status and operating parameters of the central air-conditioning unit obtained by the monitoring module during the operation phase, and the replacement device corresponding to the faulty device is determined, and a replacement strategy is generated and sent to the execution module.

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