Data machine room refrigerating unit energy-saving operation method and related device

Abstract

The invention discloses a data machine room refrigerating unit energy-saving operation method and a related device, and belongs to the technical field of data center heat dissipation energy-saving control. The method specifically comprises the steps that a large group control strategy is constructed, and under the condition that operation parameters of an air conditioning system are kept unchanged and equipment is not changed, the operation number of cooling towers, water chilling units and corresponding water pumps is adjusted; a small group control strategy is constructed, and under the condition that the number of water chilling units, cooling towers and water pumps which operate is not changed, a frequency conversion fan and a frequency conversion water pump which are based on PID control control the air conditioning system to operate in an energy-saving mode under the optimal parameters; and based on the large group control strategy and the small group control strategy, running under the optimal parameters, and meanwhile, dynamically adjusting the running number of cooling towers, water chilling units and corresponding water pumps and the temperature of cooling water, so that energy-saving running of the refrigerating units in the data machine room is realized.

Description

Background Art

[0002] A data computer room is an aggregate of high-density electronic components. Many components are sensitive to air temperature, humidity, and dust content. Therefore, an air conditioning system with stable operation and rapid feedback is required to ensure the normal operation of IT equipment in the computer room. Due to the large number of heat dissipation devices in the data center and its operation throughout the year, it has a load characteristic of high heat generation and low moisture dissipation. The load characteristic of the data center determines that its energy consumption level is different from that of conventional buildings. The energy consumption of general commercial buildings is 50 - 110 W / m 2 , while the energy consumption of the data center is 120 - 940 W / m 2 . According to the research data of the US EYP company, about 40% of the energy consumption of the data computer room is brought by the air conditioning system, and the operation energy consumption is huge.

[0003] At present, there is still a large space for energy conservation in the field of data centers. The air conditioning system of the data center can be roughly divided into two major parts: the cold source system and the front-end system. The cold source system mainly consists of chillers, chilled water circulation pumps, cooling water circulation pumps, cooling towers, cooling water circulation water tanks, distributors (collectors), expansion tanks, and their connecting pipes, etc. The energy consumption of the cold source system accounts for about 60% of the total energy consumption of the air conditioning system. The front-end system mainly consists of supply air fans, fresh air fans, heat exchange coils, and corresponding connecting pipes. The energy consumption of the front-end system accounts for about 40% of the total energy consumption of the air conditioning system.

[0004] Existing solutions mostly separate the two systems. The cold source system focuses on the energy conservation of chillers; the front-end system focuses on the energy conservation of fan units. However, each device inside the cold source system and the front-end system will affect the performance of the entire air conditioning system. The factors involved in energy conservation optimization are complex and diverse, and each factor will also interact with each other. It is very difficult to achieve the goal of high-efficiency energy conservation of the air conditioning system by simply optimizing a part of the devices or parameters. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide an energy-saving operation method and related device for a chiller in a data computer room to solve the technical problem of large power consumption in existing data centers in view of the deficiencies in the above-mentioned prior art.

[0006] The present invention adopts the following technical solutions: An energy-saving operation method for a chiller in a data computer room includes the following steps: Construct a large group control strategy to adjust the number of operating units of the cooling tower, chiller, and corresponding water pumps without changing the operating parameters of the air conditioning system and without replacing the equipment; Construct a small group control strategy to control the air conditioning system to operate energy-efficiently under optimal parameters based on variable-frequency fans and variable-frequency water pumps with PID control while the number of operating units of the chiller, cooling tower, and water pumps remains unchanged; Based on the large-scale group control strategy and the small-scale group control strategy, it operates under optimal parameters, and simultaneously dynamically adjusts the number of operating units of the cooling tower, chiller and corresponding pumps, as well as the cooling water temperature, to achieve energy-saving operation of the chiller in the data room.

[0007] Preferably, the large-scale group control strategy is as follows: Real-time monitor the operating status of the cooling tower; construct the start-stop logic of the cooling tower and dynamically adjust the number of operating units of the cooling tower; On the premise of meeting the requirements of the end computer room, calculate the unit load rate and energy consumption when different numbers of units are turned on, Conduct cooling load calculation and demand prediction, determine the start-stop logic of the chiller, determine the optimal number of operating units according to the total energy consumption of the units, and dynamically adjust the number of operating units of the cooling tower.

[0008] Preferably, the start-stop logic of the cooling tower is as follows: When the real-time power of the cooling tower fan Q v ≥95%×rated power Q vn it is determined as high load, and one more cooling tower is started; When Q v ≤80%× Q vn it is determined as low load, and one cooling tower is shut down.

[0009] Preferably, the start-stop logic of the chiller is as follows: When the real-time cooling load Q c is greater than the minimum refrigerating capacity for the chiller to start and run L min the air-conditioning system starts the chiller.

[0010] When multiple units are running, according to the real-time COP and unit load rate PLR of the chiller operation, calculate the energy consumption of operating n chillers L n and the energy consumption of operating n + 1 chillers L n+1 , according to L n and L n+1 determine the number of chillers to be turned on, and then allocate the unit load.

[0011] Preferably, the small-scale group control strategy is specifically: During the operation of the air-conditioning system, when the cooling capacity of the chiller is constant, based on the return air temperature T of the computer room 0, a control signal is given through the PID variable-frequency fan control logic to adjust the fan frequency, reducing or increasing the air supply flow rate to meet the requirements of the terminal machine room; The fixed temperature difference control method is adopted. When the chilled water supply temperature is constant and the terminal load changes, the chilled water return temperature is monitored, and the frequency of the water pump motor is adjusted through the PID variable-frequency water pump control logic to change the flow rate to meet the requirements of the terminal machine room.

[0012] Preferably, the PID variable-frequency fan control logic is as follows: According to the requirements of the machine room, the machine room temperature T h is set to: 22°C to 24°C; When the return air temperature T of the machine room 0 is greater than or equal to the set return air temperature T of the machine room h , the fan frequency is increased to increase the air supply volume; When the return air temperature T of the machine room 0 is less than the set return air temperature T of the machine room h , the fan frequency is decreased to reduce the air supply volume, meeting the temperature requirements of the terminal machine room.

[0013] Preferably, the PID variable-frequency water pump control logic is as follows: The supply and return water temperature difference is set, and the margin is set to 5%; When the chilled water supply and return water temperature difference is lower than the supply and return water temperature difference, the frequency of the water pump motor is adjusted to reduce the chilled water flow rate to meet the temperature requirements of the terminal machine room; When the chilled water supply and return water temperature difference is greater than or equal to the supply and return water temperature difference, the operating power of the water pump is increased to meet the temperature requirements of the terminal machine room.

[0014] In a second aspect, an embodiment of the present invention provides a data center chiller energy-saving operation system, including: A large group control module that constructs a large group control strategy to adjust the number of operating units of the cooling tower, chiller, and corresponding water pumps without changing the operating parameters of the air conditioning system and without replacing equipment; A small group control module that constructs a small group control strategy to make the air conditioning system operate energy-efficiently at optimal parameters based on the variable-frequency fan and variable-frequency water pump controlled by PID while the number of operating units of the chiller, cooling tower, and water pump remains unchanged; An output module that operates at optimal parameters based on the large group control strategy and the small group control strategy, and simultaneously dynamically adjusts the number of operating units of the cooling tower, chiller, and corresponding water pumps, as well as the cooling water temperature, to achieve energy-saving operation of the data center chiller.

[0015] In a third aspect, a computer device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the above-mentioned data center chiller energy-saving operation method are implemented.

[0016] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, including a computer program, and when the computer program is executed by a processor, the steps of the above-mentioned energy-saving operation method for a chilled water unit in a data computer room are implemented.

[0017] In a fifth aspect, a chip includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the above-mentioned energy-saving operation method for a chilled water unit in a data computer room are implemented.

[0018] In a sixth aspect, an embodiment of the present invention provides an electronic device, including a computer program, and when the computer program is executed by the electronic device, the steps of the above-mentioned energy-saving operation method for a chilled water unit in a data computer room are implemented.

[0019] Compared with the prior art, the present invention has at least the following beneficial effects: An energy-saving operation method for a chilled water unit in a data computer room, according to the load and weather factors of the computer room, on the premise of meeting user requirements, scientifically calculates the number of operating units of the chilled water unit, cooling tower, and their corresponding water pumps, and tries to reduce the redundancy of the number of units; the small group control strategy uses PID control for variable-frequency fans and variable-frequency water pumps to make the system operate under the condition of maintaining the optimal parameters as much as possible, so as to achieve the purpose of system energy saving; the large and small group control coupling strategy makes the system stable and safe, and reduces energy consumption to the greatest extent under the condition of stable and safe operation of the system.

[0020] Furthermore, according to the real-time cooling load and climate conditions, the chilled water unit, cooling tower, and water pump are dynamically started and stopped to reduce unnecessary equipment operation, ensure that the chilled water unit operates at the best load rate (50% - 80%), and avoid the decrease in COP or "surge" phenomenon caused by low load (PLR < 50%). Energy saving is achieved only by adjusting the number of operating units of the equipment, without replacing hardware or large-scale system transformation, with low control complexity. By reasonably distributing the load, short-term frequent start and stop of the unit are avoided, and mechanical wear is reduced. All equipment is fully opened in summer with high load, and the number of operating units is reduced in winter with low load, flexibly matching the actual demand. In the transitional season, outdoor low-temperature air is combined for auxiliary heat dissipation to further reduce energy consumption.

[0021] Furthermore, by reasonably distributing the load, short-term frequent start and stop of the unit are avoided, and mechanical wear is reduced. The same model units are rotated for operation to avoid long-term high-load operation of a single device. Furthermore, the small group control strategy determines the optimal parameters through simulation, uses the PID algorithm to achieve real-time adjustment, and significantly improves the energy efficiency ratio (COP) of the chilled water unit by increasing the chilled water temperature, especially more obvious under partial load, realizing the efficient operation of the air-conditioning system, especially suitable for scenarios with fixed number of equipment but fluctuating load.

[0022] Furthermore, the variable-frequency fans and pumps adjust the frequency in real time according to the temperature and flow deviation to ensure that the air supply volume and water flow rate accurately match the demand, avoiding waste caused by overcooling or overheating.

[0023] It can be understood that the beneficial effects of the above-mentioned second aspect to sixth aspect can be referred to the relevant descriptions in the first aspect above, and will not be elaborated here.

[0024] In summary, the present invention realizes deep energy saving through parameter optimization and variable-frequency technology, and is suitable for scenarios with obvious equipment redundancy and large load fluctuations. It can quickly reduce energy consumption with low cost and simple operation, maximize the energy-saving potential, and provide a green solution that takes into account both economy and stability for the data center.

[0025] The technical solution of the present invention will be further described in detail below through the drawings and embodiments. Description of the Drawings

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be briefly introduced below. Obviously, the following described drawings are only some embodiments of the present application, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts.

[0027] Figure 1 It is a flow chart of the cooling tower group control strategy; Figure 2 It is a flow chart of the chiller group control strategy; Figure 3 It is a control flow chart of the variable-frequency fan; Figure 4 It is a control flow chart of the variable-frequency pump; Figure 5 It is an operation diagram of the air conditioning system in the data center computer room; Figure 6 It is a working principle diagram of the chiller; Figure 7 is the hourly load change curves of the data room for one year and one day. Among them, (a) is the hourly load change curve for one year, and (b) is the hourly load change curve for November 1st; Figure 8 It is a comparison diagram of the system COP under the actual operation of the system and the operation of the large and small group control coupling strategy; Figure 9 It is a schematic diagram of the computer device provided by an embodiment of the present invention; Figure 10 It is a block diagram of an electronic device provided by an embodiment of the present invention; Figure 11 It is a flow chart of the present invention.

[0028] Among them, 60. computer device; 61. processor; 62. memory; 63. computer program; 600. electronic device; 610. processing unit; 620. storage unit; 6201. random access storage unit; 6202. cache storage unit; 6203. read-only storage unit; 6204. program / utilities; 6205. program module; 630. bus; 640. display unit; 650. input / output interface; 660. network adapter; 700. external device. Specific embodiments

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] In the description of the present invention, it should be understood that the terms "include" and "comprise" indicate the presence of the described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or their combinations.

[0031] It should also be understood that the terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include the plural forms.

[0032] It should be further understood that the term " / and" used in the specification of the present invention and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations. For example, A and / or B can represent: the presence of A alone, the presence of both A and B, and the presence of B alone. In addition, the character " / " in the present invention generally represents an "or" relationship between the associated objects before and after.

[0033] It should be understood that although the terms first, second, third, etc. may be used in the embodiments of the present invention to describe preset ranges, etc., these preset ranges should not be limited to these terms. These terms are only used to distinguish the preset ranges from each other. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0034] Depending on the context, as used herein, the term "if" can be interpreted as "when" or "while" or "in response to determining" or "in response to detecting". Similarly, depending on the context, the phrase "if determined" or "if detecting (stated condition or event)" can be interpreted as "when determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)".

[0035] Various structural schematic diagrams according to the disclosed embodiments of the present invention are shown in the accompanying drawings. These figures are not drawn to scale, where for the purpose of clear expression, some details are enlarged and some details may be omitted. The shapes of various regions and layers shown in the figures, as well as their relative sizes and positional relationships, are merely exemplary, and in practice, there may be deviations due to manufacturing tolerances or technical limitations, and those skilled in the art can additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0036] The present invention provides an energy-saving operation method for a refrigeration unit in a data computer room, which combines two methods of large group control strategy and small group control strategy, enables the air conditioning system to operate under optimal parameters, and meets the cold load requirements of the end computer room by adjusting the number of chillers and cooling towers, controlling variable-frequency water pumps and variable-frequency fans to adjust the flow rate through PID technology, etc., solves the problem of low efficiency during low load caused by traditional fixed number of units operation, avoids overloading or inefficient operation of equipment, prolongs the service life of the unit, and realizes refined control of the cold source system through the large group control strategy; the small group control strategy realizes the efficient operation of the air conditioning system through parameter optimization and dynamic control, is applicable to scenarios where the number of equipment is fixed but the load fluctuates, and provides a reliable solution for the high-efficiency energy saving of the air conditioning system in the data center.

[0037] Embodiment 1 Please refer to Figure 11 , an energy-saving operation method for a refrigeration unit in a data computer room of the present invention, includes the following steps: S1. Large group control strategy; It is proposed for chillers, cooling towers, and water pumps, that is, without changing the system operation parameters and without replacing equipment, by adjusting the number of operating units of the cooling tower, chiller, and corresponding water pumps, reducing system redundancy, and achieving the purpose of energy saving; S101. Cooling tower group control strategy S1011. Real-time monitor the operation status of the cooling tower; Collect data: cooling water flow rate, cooling tower fan power Q v , cooling water inlet and outlet temperatures, outdoor temperature and humidity.

[0038] Calculate the real-time cold load demand: Based on the cold load model of the computer room and weather conditions, predict the current required heat exchange capacity.

[0039] S1012. Determine the start-stop logic of the cooling tower; Please refer to Figure 1 , the control logic is as follows: as the required cooling load changes, the heat exchange amount required by the chiller will also change, which will affect the flow rate of the cooling water. Therefore, the real-time power Q v of the cooling tower fan that supplies the cooling water N t also changes accordingly,

[0040] When the real-time power of the cooling tower fan Q v ≥ 95% × rated power Q vn , and the inlet and outlet temperatures cannot maintain the design temperature, this is an adverse condition, which is determined as "high load", and an additional cooling tower needs to be started to meet the requirements of the chiller for the cooling water; when Q v ≤ 80% × Q vn , it is determined as "low load", and one cooling tower is shut down.

[0041] Priority rules: Preferentially enable the cooling tower with higher energy efficiency (such as a new tower or a well-maintained tower).

[0042] In winter or at low load, reduce the number of operating units to reduce the energy consumption of the fans and pumps.

[0043] S1013. Dynamically adjust the number of operating cooling towers.

[0044] Since the heat exchange of the cooling water in the cooling tower is closely related to the external environment, the group control of the cooling tower is greatly affected by climate factors, and the number of started cooling towers will also change with the seasons.

[0045] Summer high-temperature scenario: The demand for cooling water is large, and all cooling towers need to be fully opened (such as increasing from 3 to 4).

[0046] Adjust the wind speed through a variable-frequency fan to avoid excessive heat dissipation.

[0047] Spring and autumn transition seasons: Flexibly increase or decrease the number of units according to the load fluctuation (such as reducing from 3 to 1).

[0048] Combine natural cooling (such as using low-temperature air to assist heat dissipation).

[0049] S102. Chiller group control strategy The group control strategy of chillers mainly involves the control of the number of operating units and load distribution. The energy consumption of a chiller is related to its coefficient of performance (COP). The COP is the ratio of the actual refrigeration capacity of the unit to the total energy consumption of the unit. The higher the COP, the more energy-efficient the unit operates. On the premise of meeting the requirements of the terminal machine room, calculate the load rate and energy consumption of the units when different numbers of units are started, compare the total energy consumption of the units, and thus determine the optimal number of operating units.

[0050] S1021. Calculate the cooling load and predict the demand; Input data: hourly heat generation of IT equipment, heat transfer through the building envelope, outdoor temperature and humidity.

[0051] Calculate the real-time cooling load Q c : Q c = Q IT设备 + Q 围护结构 Among them, Q IT设备 Accounts for more than 90% of the total cooling load of the machine room.

[0052] S1022. Determine the start-stop logic of the chiller; Please refer to Figure 2 , the control logic is: when the real-time cooling load Q c Is greater than the minimum refrigeration capacity for the chiller to start and run L min , the system starts the chiller.

[0053] When multiple units are running, calculate the energy consumption of running n chillers L n And the energy consumption of running n + 1 chillers L n+1 , compare L n And L n+1 To determine the number of chillers to be started, and then further distribute the unit load and select a plan with lower energy consumption.

[0054] Unit load distribution rules: For units of the same model, the load is evenly distributed (for example, 2 units each bear 50% of the cooling load).

[0055] Give priority to running units with a higher coefficient of performance (COP).

[0056] S1023. Dynamically adjust the number of operating chillers; High-load scenarios (such as in summer): When the cooling load approaches the upper limit of a single unit, start the standby unit (e.g., increase from 2 units to 3 units).

[0057] Avoid overloading a single unit (PLR > 80%) to prevent a drop in COP.

[0058] Low-load scenarios (such as in winter): Reduce the number of operating units (e.g., decrease from 2 units to 1 unit), but ensure that PLR > 20% to avoid "surge".

[0059] S1024. Coordinate the operation of the water pumps.

[0060] The chilled water pump and the cooling water pump start and stop synchronously with the chiller (1 unit corresponds to 1 pump).

[0061] Convert the constant-frequency water pump to variable-frequency control and adjust the flow rate as needed (e.g., reduce the operation of redundant water pumps).

[0062] S2. Small group control strategy An energy-saving strategy that, with the number of operating units of the chiller, cooling tower, and water pump remaining unchanged, uses variable-frequency fans and variable-frequency water pumps based on PID control to ensure the system operates at optimal parameters.

[0063] The small group control strategy is for the system to operate with optimized parameters. The cooling water pump is converted to a variable-frequency water pump, and PID control technology is added to the variable-frequency chilled water pump, cooling water pump, and precision air-conditioning fan to improve the dynamic quality correction of the system, thus ensuring that the system always operates with optimized parameters.

[0064] The PID control algorithm combines the proportional, integral, and derivative links. It is the most mature and widely used effective control algorithm for continuous system dynamic quality correction. The essence of PID control is to perform operations according to the function relationships of proportion, integral, and derivative based on the input deviation value, and the operation result is used to control the output. Practical operation experience and theoretical analysis both show that when using this control law to control many industrial processes, relatively satisfactory results can be obtained.

[0065] S201. PID-based variable-frequency fan control During the operation of the system, the terminal load changes in real time. When the cooling capacity of the chiller is constant, it is necessary to monitor the return air temperature T of the machine room 0 , and the PID gives a control signal to adjust the fan frequency, reducing or increasing the air supply flow rate to meet the requirements of the terminal machine room.

[0066] Please refer to Figure 3 , and the control logic is as follows: S2011. Set the computer room temperature T according to the requirements of the computer room h to be: 22°C to 24°C; S2012. When the return air temperature T of the computer room 0 is greater than the set return air temperature T of the computer room h , it means that the cooling capacity provided by the precision air conditioner cannot meet the demand of the terminal. At this time, the PID control module sends a signal to increase the fan frequency and increase the air supply volume; S2013. When T 0 is less than the set return air temperature T of the computer room h , it indicates that the air volume is too large. At this time, the PID control module sends a signal to decrease the fan frequency and reduce the air supply volume, so as to meet the temperature requirements of the terminal computer room.

[0067] S202. Variable frequency water pump control based on PID The chilled water system adopts the constant temperature difference control method. When the chilled water supply temperature is constant and the terminal load changes, the PID control module adjusts the frequency of the water pump motor by monitoring the chilled water return temperature to change the flow rate, so as to meet the needs of the terminal computer room.

[0068] Please refer to Figure 4 , and the control logic is as follows: S2021. Set the temperature difference between the supply and return water to be 3°C, with a 5% margin; S2022. When the PID control module detects that the temperature difference between the chilled water supply and return water is lower than 2.85°C, it indicates that the chilled water flow rate is too large. At this time, the PID control sends a signal to adjust the frequency of the water pump motor and reduce the chilled water flow rate, so as to meet the temperature requirements of the terminal computer room; S2023. When the temperature difference between the chilled water supply and return water is greater than 3.15°C, it indicates that the flow rate is too small. At this time, the PID control sends a signal to increase the operating power of the water pump, so as to meet the temperature requirements of the terminal computer room.

[0069] S3. Based on the equipment number adjustment obtained from the large group control strategy in step S1 and the parameter optimization + PID control obtained from the small group control strategy in step S2, operate at the optimal parameters, and at the same time dynamically adjust the number of operating cold source equipment and the cooling water temperature.

[0070] By optimizing the operating parameters of the air conditioning system, adding PID controllers to the fans and water pumps, and adjusting the operating frequencies of the fans and water pumps, the present invention ensures that the air conditioning system operates at the optimal operating parameters. The number of operating cooling towers and cooling water pumps is adjusted according to the season, and the large and small group control coupling strategy is adopted, effectively reducing the operating cost and generating good economic and social benefits Those skilled in the art can understand that various aspects of the present invention can be implemented as a system, a method, or a program product. Therefore, various aspects of the present invention can be specifically implemented in the following forms, namely: a complete hardware implementation, a complete software implementation (including firmware, microcode, etc.), or an implementation combining hardware and software aspects, which can be collectively referred to as "circuit", "module", or "platform".

[0071] Embodiment 2 The present invention provides an energy-saving operation system for a data center chiller unit, which can be used to implement the above-mentioned energy-saving operation method for the data center chiller unit. Specifically, the energy-saving operation system for the data center chiller unit includes a large group control module, a small group control module, and an output module.

[0072] Among them, the large group control module constructs a large group control strategy to adjust the number of operating units of the cooling tower, chiller, and corresponding pumps while maintaining the operating parameters of the air conditioning system unchanged and without replacing equipment. The small group control module constructs a small group control strategy to control the air conditioning system to operate energy-efficiently at optimal parameters based on the variable-frequency fans and variable-frequency pumps controlled by PID while the number of operating units of the chiller, cooling tower, and pumps remains unchanged. The output module operates at optimal parameters based on the large group control strategy and the small group control strategy, and at the same time dynamically adjusts the number of operating units of the cooling tower, chiller, and corresponding pumps, as well as the cooling water temperature, to achieve energy-saving operation of the data center chiller unit.

[0073] Embodiment 3 The present invention provides a terminal device, which includes a processor and a memory. The memory is used to store a computer program, and the computer program includes program instructions. The processor is used to execute the program instructions stored in the computer storage medium. The processor may be a Central Processing Unit (CPU), or may also be other general-purpose processors, Graphics Processing Unit (GPU), Tensor Processing Unit (TPU), Digital Signal Processor (DSP), Application Specific Integrated Circuit (ASIC), Field-Programmable Gate Array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. It is the computing core and control core of the terminal, and is suitable for implementing one or more instructions. Specifically, it is suitable for loading and executing one or more instructions to implement the corresponding method flow or corresponding function. The processor described in the embodiments of the present invention can be used for the operation of the energy-saving operation method of the refrigeration unit in the data computer room, including: Construct a large group control strategy to adjust the number of operating units of the cooling tower, chiller and corresponding pumps without changing the operating parameters of the air conditioning system and without replacing the equipment. Construct a small group control strategy to control the air conditioning system to operate energy-efficiently under optimal parameters based on the variable-frequency fan and variable-frequency pump based on PID control without changing the number of operating units of the chiller, cooling tower and pump. Based on the large group control strategy and the small group control strategy, operate under optimal parameters, and at the same time dynamically adjust the number of operating units of the cooling tower, chiller and corresponding pumps, as well as the cooling water temperature, to achieve energy-saving operation of the refrigeration unit in the data computer room.

[0074] Please refer to Figure 9 , the terminal device is a computer device. The computer device 60 in this embodiment includes: a processor 61, a memory 62, and a computer program 63 stored in the memory 62 and executable on the processor 61. When the computer program 63 is executed by the processor 61, it implements the energy-saving operation method of the refrigeration unit in the data computer room in the embodiment. To avoid repetition, it will not be elaborated here one by one. Alternatively, when the computer program 63 is executed by the processor 61, it implements the functions of each model / unit in the energy-saving operation system of the refrigeration unit in the data computer room in the embodiment. To avoid repetition, it will not be elaborated here one by one.

[0075] The computer device 60 may be a computing device such as a desktop computer, a notebook, a palm computer, and a cloud server. The computer device 60 may include, but is not limited to, a processor 61 and a memory 62. Those skilled in the art can understand thatFigure 9 This is only an example of the computer device 60, which does not constitute a limitation on the computer device 60. It may include more or fewer components than those shown, or combine certain components, or different components. For example, the computer device may also include input / output devices, network access devices, buses, etc.

[0076] The so-called processor 61 may be a central processing unit (CPU), or other general-purpose processors, graphics processing units (GPUs), tensor processing units (TPUs), digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0077] The memory 62 may be an internal storage unit of the computer device 60, such as the hard disk or memory of the computer device 60. The memory 62 may also be an external storage device of the computer device 60, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc., equipped on the computer device 60.

[0078] Furthermore, the memory 62 may also include both an internal storage unit and an external storage device of the computer device 60. The memory 62 is used to store computer programs and other programs and data required by the computer device. The memory 62 may also be used to temporarily store data that has been output or will be output.

[0079] Please refer to Figure 10 , the terminal device is the electronic device 600, and the electronic device 600 is presented in the form of a general computing device. The components of the electronic device may include, but are not limited to: at least one processing unit 610, at least one storage unit 620, a bus 630 connecting different platform components (including the storage unit 620 and the processing unit 610), a display unit 640, etc.

[0080] Among them, the storage unit stores program code, which can be executed by the processing unit 610, so that the processing unit 610 executes the steps according to various exemplary embodiments of the present invention described in the method part of this specification. For example, the processing unit 610 can execute Figure 11 the steps described above.

[0081] The storage unit 620 may include a readable medium in the form of a volatile storage unit, such as a random access storage unit (RAM) 6201 and / or a cache storage unit 6202, and may further include a read-only storage unit (ROM) 6203.

[0082] The storage unit 620 may further include a program / utilities 6204 having a set (at least one) of program modules 6205. Such program modules 6205 include, but are not limited to: an operating system, one or more application programs, other program modules, and program data. Each or some combination of these examples may include the implementation of a network environment.

[0083] The bus 630 may represent one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, a graphics acceleration port, a processing unit, or a local bus using any of a variety of bus structures.

[0084] The electronic device 600 may also communicate with one or more external devices 700 (such as a keyboard, a pointing device, a Bluetooth device, etc.), and may also communicate with one or more devices that enable a user to interact with the electronic device 600, and / or communicate with any device that enables the electronic device 600 to communicate with one or more other computing devices (such as a router, a modem). Such communication may be carried out through the input / output interface 650. In addition, the electronic device 600 may also communicate with one or more networks (such as a local area network, a wide area network, and / or a public network, such as the Internet) through the network adapter 660. The network adapter 660 may communicate with other modules of the electronic device 600 through the bus 630. It should be understood that although not shown in the figure, other hardware and / or software modules may be used in conjunction with the electronic device 600, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage platforms, etc.

[0085] Example 4 The present invention also provides a storage medium, specifically a computer-readable storage medium, which is a memory device in a terminal device for storing programs and data. It can be understood that the computer-readable storage medium here can include both the built-in storage medium in the terminal device and, of course, the expandable storage medium supported by the terminal device. It can be any tangible medium that contains or stores a program, and this program can be used by or in conjunction with an instruction execution system, apparatus, or device. The computer-readable storage medium provides storage space, and this storage space stores the operating system of the terminal. Moreover, in this storage space, one or more instructions suitable for being loaded and executed by the processor are also stored, and these instructions can be one or more computer programs (including program codes). It should be noted that more specific examples of the computer-readable storage medium here include: an electrical connection having one or more wires, a portable disk, a hard disk, a random access memory, a read-only memory, an erasable programmable read-only memory, an optical fiber, a portable compact disk read-only memory, an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0086] The computer-readable storage medium also includes data signals propagated in a baseband or as part of a carrier wave, in which the readable program code is carried. Such propagated data signals can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. The readable storage medium can also be any readable medium other than the readable storage medium, and this readable medium can send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device. The program code contained on the readable storage medium can be transmitted by any appropriate medium, including but not limited to wireless, wired, optical cable, radio frequency, etc., or any suitable combination of the above.

[0087] The program code for performing the operations of the present invention can be written in any combination of one or more programming languages. The programming languages include object-oriented programming languages such as Java, C++, etc., and also include conventional procedural programming languages such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computing device, partially on the user's device, executed as an independent software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server. In the case of a remote computing device, the remote computing device can be connected to the user's computing device through any type of network, including a local area network or a wide area network, or can be connected to an external computing device (for example, by using an Internet service provider to connect through the Internet).

[0088] One or more instructions stored in a computer-readable storage medium can be loaded and executed by a processor to implement the corresponding steps of the method for energy-saving operation of a chiller unit in a data center in the above embodiments; one or more instructions in the computer-readable storage medium are loaded and executed by the processor to perform the following steps: Construct a large-scale group control strategy to adjust the number of operating units of cooling towers, chillers, and corresponding pumps while maintaining the operating parameters of the air conditioning system unchanged and without replacing equipment; construct a small-scale group control strategy to control the air conditioning system to operate energy-efficiently under optimal parameters based on variable-frequency fans and variable-frequency pumps with PID control while the number of operating units of chillers, cooling towers, and pumps remains unchanged; based on the large-scale group control strategy and the small-scale group control strategy, operate under optimal parameters, and at the same time dynamically adjust the number of operating units of cooling towers, chillers, and corresponding pumps, as well as the cooling water temperature, to achieve energy-saving operation of the chiller unit in the data center.

[0089] The databases involved in the embodiments provided in the present application may include at least one of a relational database and a non-relational database. The non-relational database may include a distributed database based on blockchain, etc., and is not limited thereto. The processors involved in the embodiments provided in the present application may be a general-purpose processor, a central processing unit, a graphics processing unit, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., and is not limited thereto.

[0090] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components described and shown in the accompanying drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0091] Embodiment 5 Take the data center computer room of Shanghai Electric Power Company Information and Communication Company as the research object. The company's standard information computer room is divided into three floors, with a total of 20 rooms put into operation, each room being 300 m2, the height of each floor being 5.5 m, and the raised floor of the computer room being 0.9 m. The static pressure is used to supply air to the cabinets through precision air conditioners.

[0092] The data center design uses 6 Carrier centrifugal chillers as the cold source. Currently, 3 units are in operation, and the operating mode is 2 running and 1 standby. The rated power of a single unit is 374 kw, and the refrigeration capacity of a single unit is 600 RT (refrigeration tons). The unit uses chlorine-free refrigerant, a single-stage compressor, and a jet engine type duct diffuser.

[0093] Precision air conditioners are used to precisely control the temperature and humidity in the computer room to meet the requirements of the computer room environment conditions. There are 20 standard computer rooms, and each standard computer room is equipped with 9 double-coil water-cooled precision air conditioners (6 running and 3 standby). The air volume of each precision air conditioner is 14,400 cubic meters per hour, the air pressure is 100 Pa, and the sensible cooling capacity is 40 kilowatts. The supply fan of the precision air conditioner adopts a variable-speed fan.

[0094] The indoor temperature of the computer room is 23 °C, with an error of ±2 °C, and the humidity is 40% - 60%.

[0095] The main equipment of the data center air conditioning system is shown in Table 1.

[0096] Table 1 Equipment List of the Data Center Air Conditioning System

[0097] Please refer to Figure 5 , the front-end system is mainly composed of a supply fan, a fresh air fan, a heat exchange coil, and the corresponding connecting pipes. This system is used to improve the air quality in the computer room and regulate the indoor temperature of the computer room.

[0098] The cold source system is mainly composed of chillers, chilled water circulation pumps, cooling towers, cooling water circulation pumps, cooling water circulation tanks, manifolds (collectors), expansion tanks, and their connecting pipes, etc. This system is mainly used to take out the heat from the heat exchange coils in the computer room.

[0099] The water circulation of the air conditioning system is divided into chilled water circulation and cooling water circulation, as follows: Chilled water circulation: After the chilled water absorbs the cold released by the evaporation of the refrigerant in the evaporator of the chiller, it is sent to the air-conditioned room through pipes and chilled water pumps. The indoor heat exchange coil exchanges the cold to the computer room space, and then the chilled water returns to the chiller to absorb cold, completing a chilled water circulation.

[0100] Cooling water circulation: The cooling water absorbs the heat released by the condensation of the refrigerant in the condenser of the chiller, is sent to the cooling tower through pipes and cooling water pumps, and the outdoor fan exchanges the heat to the atmospheric space, and then returns to the chiller to absorb heat, completing a cooling water circulation.

[0101] In the air conditioning system, the chiller is the heart of the entire air conditioning system and one of the main energy-consuming equipment.

[0102] Please refer to Figure 6, The chiller mainly includes: a compressor, a condenser, a throttle valve and an evaporator. Its working principle is as follows: After the liquid refrigerant absorbs the heat of the object to be cooled in the evaporator, it vaporizes into a low-temperature and low-pressure steam, which is sucked into the compressor, compressed into a high-pressure and high-temperature steam and then discharged into the condenser. In the condenser, the steam releases heat to the cooling medium (water or air) and condenses into a high-pressure liquid. After being throttled by the throttle valve into a low-pressure and low-temperature refrigerant, it enters the evaporator again to absorb heat and vaporize, achieving the purpose of circulating refrigeration. In this way, the refrigerant completes a refrigeration cycle through four basic processes of compression, condensation, throttling and evaporation in the system.

[0103] Data Center Load Calculation Using the simulation software to build a simulation platform for the data center room air conditioning system, according to the relevant parameters provided by the ICT company, the cooling load of the data center room for one year was simulated and calculated. Through calculation, the cooling load range of the data center room was obtained as 2011kW - 2965kW, and the average cooling load was 2727kW, providing a basis for the calculation of the unit load rate. Figure 7 shows the hourly load change curves of the data center room for one year and one day.

[0104] It can be seen from the figure that the data center room has the characteristics of large load and small fluctuation. This is because the IT equipment in the data center room has the characteristics of running continuously for 24 hours and high heat dissipation, making its load different from that of general commercial buildings. The fluctuation of the cooling load in the data center room is mainly affected by climate change. In summer, the heat load of the computer room building increases due to factors such as outdoor air temperature, solar radiation and geothermal heat, while in winter, it is the opposite.

[0105] Aiming at the energy-saving operation requirements of the data center room chiller, the present invention adopts the large and small group control coupling strategy as the optimal energy-saving operation strategy. The specific scheme is as follows: 1) Optimize the operating parameters of the system. The original inlet air temperature of the computer room is 20°C, the supply water temperature of the chilled water is 8°C, and the temperature difference between the supply and return water of the chilled water is 3°C; the optimized parameters are the inlet air temperature of the computer room is 18°C, the supply water temperature of the chilled water is 10, and the temperature difference between the supply and return water is 4°C; 2) Add PID controllers to the fans and pumps to adjust the operating frequencies of the fans and pumps to ensure that the system operates under the optimal operating parameters; 3) Two chillers and two chilled water pumps operate throughout the year. The number of operating cooling towers and cooling water pumps is adjusted according to the season. The specific number of operating units and the energy savings of the system are as follows: January and February: The number of operating cooling towers and cooling water pumps is adjusted from 2 to 1, and the monthly average energy consumption is reduced by 18.38%; March and April: The number of operating cooling towers and cooling water pumps is adjusted from 3 to 1, and the energy savings is reduced by 22.36%; May: The number of operating cooling towers and cooling water pumps is adjusted from 3 to 2, and the energy consumption is reduced by 18.81%; In June: The operation of the cooling tower and cooling water pump was adjusted from 4 units to 3 units, and the energy consumption was reduced by 17.79%; In July and August: The number of operating units of the cooling tower and cooling water pump was 4 units each, with a reduction of 13.00%; In September: The operation of the cooling tower and cooling water pump was adjusted from 4 units to 3 units, with a reduction of 13.71%; In October: The operation of the cooling tower and cooling water pump was adjusted from 3 units to 1 unit, with a reduction of 20.68%; In November and December: The operation of the cooling tower and cooling water pump was adjusted from 2 units to 1 unit, with a reduction of 17.35%.

[0106] Drawing on the coefficient of performance (COP) of air-conditioning equipment commonly used in life, the COP of an air conditioner is the ratio of the cooling capacity generated by the air conditioner to the power consumed. The larger the COP, the more energy-efficient the air conditioner. Define the system energy efficiency value COP. The system energy efficiency value COP is proposed based on the entire data center air-conditioning system and refers to the ratio of the cooling capacity of the entire system to the total energy consumption of the system. The larger the system energy efficiency value COP, the more energy-efficient the system and the lower the operating cost. The system COP formula is as follows:

[0107] Among them, is the total system energy consumption, is the cooling capacity of the entire system.

[0108] Please refer to Figure 8 , the annual average value of the system COP during actual operation is 2.79. After adopting the large-small group control coupling strategy, the annual average value is 3.16, and the annual average value increases by 13.13%. Among them, the increase in March is the largest, reaching 15.95%. The significant increase in the system COP value indicates that after adopting the large-small group control coupling strategy, the system operation is significantly energy-saving.

[0109] By adopting the large-small group control coupling strategy and the optimal operating parameters of the system (room inlet air temperature 18°C, chilled water supply temperature 10, supply-return water temperature difference 4°C), using the system simulation platform and through simulation calculations, the annual energy consumption can be saved by 13.3×105 kWh, and the energy consumption is reduced by 17.76%. Calculated at a electricity price of 0.7 yuan / kWh, the annual operating cost can be reduced by up to 930,000 yuan, effectively reducing the operating cost and generating good economic and social benefits.

[0110] In addition, by reducing the cooling water temperature by 5°C to 6°C, 170,000 kWh of electric energy can be saved annually.

[0111] In summary, for the energy-saving operation method and related device of the data center chiller unit of the present invention, large group control reduces equipment redundancy, small group control improves the efficiency of single equipment, jointly promotes the data center towards "carbon neutrality", and realizes energy conservation and reduction of operating costs by globally optimizing the cold source and the front-end system.

[0112] Those skilled in the art can clearly understand that, for the convenience and conciseness of description, only the above-mentioned division of each functional unit and module is used as an example. In actual applications, the above functions can be allocated to different functional units and modules according to needs, that is, the internal structure of the device is divided into different functional units or modules to complete all or part of the functions described above. Each functional unit and module in the embodiment can be integrated into a processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit. In addition, the specific names of each functional unit and module are only for the convenience of mutual distinction and do not limit the protection scope of this application. The specific working processes of the units and modules in the above system can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein.

[0113] In the above embodiments, the descriptions of the respective embodiments have their own emphases. For parts not detailed or recorded in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0114] Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed in the present invention can be implemented by electronic hardware, or by a combination of computer software and electronic hardware. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. A professional technician can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present invention.

[0115] In the embodiments provided by the present invention, it should be understood that the disclosed device / terminal and method can be implemented in other ways. For example, the device / terminal embodiments described above are only illustrative. For example, the division of the module or unit is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling or direct coupling or communication connection to each other can be through some interfaces. The indirect coupling or communication connection of the device or unit can be in an electrical, mechanical or other form.

[0116] The unit described as a separated component may or may not be physically separated, and the component displayed as a unit may or may not be a physical unit, that is, it may be located in one place, or may be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0117] In addition, each functional unit in various embodiments of the present invention may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of a software functional unit.

[0118] If the integrated module / unit is implemented in the form of a software functional unit and sold or used as an independent product, it may be stored in a computer-readable storage medium. Based on such an understanding, all or part of the processes in the above-described method embodiments of the present invention may also be completed by instructing relevant hardware through a computer program. The computer program may be stored in a computer-readable storage medium. When the computer program is executed by a processor, the steps of the above-described method embodiments may be implemented. Among them, the computer program includes computer program code, and the computer program code may be in the form of source code, object code, executable file, or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal, and software distribution medium, etc. It should be noted that the content included in the computer-readable medium may be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium does not include electrical carrier signals and telecommunication signals.

[0119] This application is described with reference to the flowcharts and / or block diagrams of methods, devices, and computer program products according to embodiments of the present application. It should be understood that each process and / or block in the flowchart and / or block diagram, and the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate a device for implementing the specified functions in Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0120] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means that implement the function specified in one or more of the flow Figure 1 acts or a plurality of acts and / or boxes Figure 1 specified in one or more of the boxes or a plurality of boxes.

[0121] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process, whereby the instructions executed on the computer or other programmable apparatus provide steps for implementing the function specified in one or more of the flow Figure 1 acts or a plurality of acts and / or boxes Figure 1 specified in one or more of the boxes or a plurality of boxes.

[0122] The above is only to illustrate the technical idea of the present invention and should not be used to limit the protection scope of the present invention. Any modifications made on the basis of the technical solution according to the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A method for energy-saving operation of a refrigeration unit in a data center, characterized in that: The following steps are involved: Build a large group control strategy to adjust the number of cooling towers, chillers and corresponding water pumps in operation without changing the operating parameters of the air conditioning system or changing the equipment; Construct a small group control strategy. When the number of chillers, cooling towers and water pumps in operation remains unchanged, the air conditioning system is controlled by variable frequency fans and variable frequency water pumps based on PID control to run energy-saving under the optimal parameters. Based on large group control strategy and small group control strategy, it operates under the optimal parameters, and dynamically adjusts the number of operating cooling towers, chillers and corresponding water pumps, as well as the cooling water temperature to achieve energy-saving operation of the data center refrigeration unit.

2. The energy-saving operation method of a data center refrigeration unit according to claim 1 is characterized in that: The specific strategy of large group control is as follows: Monitor the operating status of cooling towers in real time; build the start and stop logic of cooling towers and dynamically adjust the number of cooling towers in operation; Under the premise of meeting the requirements of the terminal room, calculate the unit load rate and energy consumption when different numbers of units are turned on. Perform cooling load calculation and demand forecast, determine the start and stop logic of the chiller, determine the optimal number of operating units based on the total energy consumption of the unit, and dynamically adjust the number of cooling towers in operation.

3. The energy-saving operation method of a data center refrigeration unit according to claim 2 is characterized in that: The start and stop logic of the cooling tower is as follows: When the cooling tower fan real-time power Q v ≥95%×rated power Q vn When the load is too high, an additional cooling tower is added. when Q v ≤80%× Q vn When the load is too low, one cooling tower is shut down.

4. The energy-saving operation method of a data center refrigeration unit according to claim 2 is characterized in that: The start and stop logic of the chiller is as follows: When the real-time cooling load Q c Greater than the minimum cooling capacity of the chiller when starting L min When the air conditioning system starts the chiller; When multiple units are running, the energy consumption of running n chillers is calculated based on the real-time COP of the chillers and the unit load rate PLR. L n Energy consumption of running n+1 chillers L n+1 ,according to L n and L n+1 The number of chillers to be turned on is determined based on the size of the chiller, and then the unit load is allocated.

5. The energy-saving operation method of a data center refrigeration unit according to claim 1, characterized in that: The specific small group control strategy is: During the operation of the air conditioning system, when the cooling capacity of the chiller is constant, based on the return air temperature T0 of the computer room, the PID variable frequency fan control logic gives a control signal to adjust the fan frequency, reduce or increase the air flow rate, to meet the needs of the terminal computer room; The constant temperature difference control method is adopted. When the chilled water supply temperature is constant and the terminal load changes, the chilled water return temperature is monitored, and the pump motor frequency is adjusted through the PID variable frequency water pump control logic to change the flow rate to meet the needs of the terminal machine room.

6. The energy-saving operation method of a data center refrigeration unit according to claim 5, characterized in that: The PID variable frequency fan control logic is as follows: According to the requirements of the computer room, set the room temperature T h Temperature: 22℃~24℃; When the return air temperature T0 of the equipment room is greater than or equal to the set return air temperature T h When the fan frequency is increased, the air supply volume is increased; When the return air temperature T0 of the equipment room is lower than the set return air temperature T h When the temperature is too high, adjust the fan frequency to reduce the air supply to meet the temperature requirements of the terminal room.

7. The energy-saving operation method of a data center refrigeration unit according to claim 5, characterized in that: The PID variable frequency water pump control logic is as follows: Set the supply and return water temperature difference and set the margin to 5%; When the temperature difference between the supply and return water of the chilled water is lower than that between the supply and return water, adjust the frequency of the water pump motor to reduce the chilled water flow rate to meet the temperature requirements of the terminal room; When the supply and return temperature difference of chilled water is greater than or equal to the supply and return temperature difference, increase the operating power of the water pump to meet the temperature requirements of the terminal equipment room.

8. An energy-saving operation system for a refrigeration unit in a data center, characterized in that: include: Large group control module, builds large group control strategy, and adjusts the number of cooling towers, chillers and corresponding water pumps in operation without changing the operating parameters of the air conditioning system or changing the equipment; Small group control module, builds a small group control strategy. When the number of chillers, cooling towers and water pumps in operation remains unchanged, the air conditioning system is controlled by PID-controlled variable frequency fans and variable frequency water pumps to run energy-efficiently under the optimal parameters. The output module operates under the optimal parameters based on the large group control strategy and the small group control strategy, and dynamically adjusts the number of operating cooling towers, chillers and corresponding water pumps, as well as the cooling water temperature to achieve energy-saving operation of the data center refrigeration unit.

9. A computer-readable storage medium storing one or more programs, characterized in that: The one or more programs include instructions, which, when executed by a computing device, cause the computing device to perform the method of any one of claims 1 to 7.

10. A computing device, characterized in that include: One or more processors, a memory and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, and the one or more programs include steps for executing the method according to any one of claims 1 to 7.

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