An energy-saving control method, device, equipment and medium for an air conditioning chilled water system of a data center

Abstract

The application provides an energy-saving control method, device, equipment and medium for an air conditioning chilled water system of a data center, the control method comprising: acquiring real-time chilled water flow of each user in the air conditioning chilled water system; wherein the air conditioning chilled water system comprises a chilled water pump; acquiring average chilled water flow in a unit mapping time period based on real-time chilled water flow data string of each user in the unit mapping time period; acquiring the sum of average chilled water flow of all users in the unit mapping time period based on average chilled water flow of each user in the unit mapping time period; taking the sum of the average chilled water flow sum in the unit mapping time period and a set residual flow as supply demand flow in the next unit mapping time period; and adjusting the working frequency of the chilled water pump based on the corresponding supply demand flow in the next unit mapping time period. The method of the application can timely and accurately control water flow supply and save energy consumption.

Description

Technical Field

[0001] This invention belongs to the field of HVAC technology and relates to a control method for an air conditioning chilled water system, particularly an energy-saving control method for an air conditioning chilled water system used in data centers. Background Technology

[0002] Currently, there are two methods for controlling the pump speed in air conditioning chilled water systems: constant differential pressure control and variable differential pressure control. Variable differential pressure control requires pressure sensors at each terminal to continuously compare and identify the most unfavorable terminal pressure difference and adjust the pump speed accordingly. Therefore, the investment is relatively high, the control logic is complex and prone to errors and loss of control, and implementation is difficult. In practice, variable differential pressure control is less commonly used, and constant differential pressure control is the most prevalent. In practical applications of constant differential pressure control, depending on the location of the differential pressure sensor, it is divided into terminal main pipe constant differential pressure control and initial main pipe constant differential pressure control. Firstly, the initial main pipe constant differential pressure control system requires the system flow rate to exceed the terminal demand flow rate, making it difficult to achieve a perfect supply-demand match and resulting in energy waste. Secondly, the initial main pipe constant differential pressure control has a low fault tolerance rate and a high risk of system failure. In practical applications, when the most unfavorable loop is clearly identified, terminal main pipe constant differential pressure control is more energy-efficient than initial main pipe constant differential pressure control. However, the constant pressure differential control method for terminal trunk lines has several drawbacks. First, the constant pressure control target for terminal trunk lines is set based on the safe operating pressure differential of the air conditioner at full power, which is typically 400-800 kPa. Increasing this by 200-400 kPa to set the system's constant pressure control target significantly amplifies the flow supply target, making energy consumption difficult to control effectively. Second, the most unfavorable constant pressure differential sensor is usually installed at the highest point at the end of the line. However, the most unfavorable point in the system is not necessarily the highest point where user power consumption is high or fluctuates greatly, making it difficult for the terminal constant pressure control to simultaneously consider the overall flow demand and changes of users. Third, when the flow demand of a certain user changes, if other user branches do not adjust, the available pressure head of other users remains relatively stable. The system needs to detect changes in the user's flow demand, which increases the detection delay. The farther the user is from the control point, the less accurate the detection of the most unfavorable constant pressure differential becomes, and the longer the detection delay.

[0003] In practical applications, neither the constant differential pressure control at the end of the main pipeline nor the constant differential pressure control at the beginning of the main pipeline can precisely control the flow supply and demand of the system. Both have a certain lag, meaning that changes in the flow of other users cannot be quickly reflected in the differential pressure, resulting in the system being unable to change the flow transmission in a timely manner, insufficient control accuracy, and wasted power. Summary of the Invention

[0004] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide an energy-saving control method, device, equipment and medium for air conditioning chilled water systems in data centers, to solve the problems of energy waste or failure to supply energy in a timely manner due to control lag and insufficient control accuracy in the existing air conditioning chilled water system control methods.

[0005] To achieve the above and other related objectives, the present invention is implemented by including the following technical solutions.

[0006] In a first aspect, this application provides an energy-saving control method for an air conditioning chilled water system in a data center, comprising: acquiring the real-time chilled water flow rate of each user in the air conditioning chilled water system; wherein the air conditioning chilled water system includes a chilled water pump; acquiring the average chilled water flow rate within the unit mapping time period based on the real-time chilled water flow rate data string of each user within the unit mapping time period; acquiring the sum of the average chilled water flow rates of all users within the unit mapping time period based on the average chilled water flow rates of each user within the unit mapping time period; using the sum of the average chilled water flow rates within the unit mapping time period and a set margin flow rate as the supply-demand flow rate for the next unit mapping time period; and adjusting the operating frequency of the chilled water pump based on the corresponding supply-demand flow rate in the next unit mapping time period.

[0007] In some embodiments of the first aspect of this application, the user is a floor, a communication equipment room unit, or a communication equipment unit.

[0008] In some embodiments of the first aspect of this application, the unit mapping time period is 10 to 180 seconds. In this application, the unit mapping time period can be any fixed value between 10 and 180 seconds.

[0009] In some embodiments of the first aspect of this application, the margin flow rate is 10~100m³. 3 / h, in this application, the margin flow rate can be 10~100m³ / h. 3 Any specific value in / h.

[0010] In some embodiments of the first aspect of this application, the air conditioning chilled water system includes one or more users, with any one user and any other user connected in parallel via chilled water pipelines.

[0011] In some embodiments of the first aspect of this application, the air conditioning chilled water system is provided with a regulating valve at the user's location, and the air conditioner controls the valve opening of the regulating valve in real time according to the supply and return air temperatures to ensure that the air conditioner acts on the user at a constant set temperature.

[0012] In some embodiments of the first aspect of this application, the reserve flow rate is fixed within a unit time period, and the reserve flow rate value in the next unit time period is set based on the variation range of the sum of the real-time chilled water flow rates of each user in a similar historical time period, so as to meet the flow demand of users in the air conditioning chilled water system while saving more energy.

[0013] In some embodiments of the first aspect of this application, the historical time period is 1 to 30 days.

[0014] In some embodiments of the first aspect of this application, the unit time period is 1 to 120 days.

[0015] In some embodiments of the first aspect of this application, the air conditioning chilled water system includes at least two chilled water pumps connected in parallel; the operating frequency and / or number of chilled water pumps in the next mapped time period are controlled according to the supply demand flow rate to ensure that the supply demand flow rate is met; when the supply demand flow rate is small and only the operating frequency of one pump is needed to meet it, the pump frequency is controlled according to the supply demand flow rate; when the supply demand flow rate is large and the highest operating frequency of one pump is still insufficient to meet it, the number of pumps in operation is increased to ensure that the supply demand flow rate is met.

[0016] In some embodiments of the first aspect of this application, the air conditioning chilled water system further includes a bypass pipeline, which is connected in parallel with any chilled water pipeline acting on the user; when only one chilled water pump is in the lowest frequency operating state and the total average chilled water flow rate per unit mapping time is still less than 85% of the minimum flow rate corresponding to the lowest frequency, the bypass pipeline is controlled to be connected to ensure the flow rate required for safe system operation.

[0017] A second aspect of this application provides a control device for an air conditioning chilled water system in a data center, comprising: a real-time chilled water flow acquisition module for acquiring the real-time chilled water flow of each user in the air conditioning chilled water system; an average chilled water flow acquisition module for acquiring the average chilled water flow within a unit mapping time period based on the real-time chilled water flow data string of each user within the unit mapping time period; an average chilled water flow sum acquisition module for acquiring the sum of the average chilled water flow of all users within the unit mapping time period based on the average chilled water flow of each user within the unit mapping time period; a supply and demand flow acquisition module for using the sum of the average chilled water flow within the unit mapping time period and a set margin flow as the supply and demand flow in the next unit mapping time period; and a chilled water pump operating frequency control module for adjusting the operating frequency of the chilled water pump based on the corresponding supply and demand flow in the next unit mapping time period.

[0018] In some embodiments of the second aspect of this application, the control device further includes a surplus flow rate adjustment module, used to control the surplus flow rate to follow the change within a set range based on the changing trend of the sum of the real-time chilled water flow rates of each user within a unit time period.

[0019] In some embodiments of the second aspect of this application, the control device further includes a chilled water pump operating number control module, used to control the number of chilled water pumps operating in the next mapping time period according to the supply demand flow rate to ensure that the supply demand flow rate is met.

[0020] In some embodiments of the second aspect of this application, the control device further includes a bypass pipeline control module, used to control the bypass pipeline to ensure the flow required for safe system operation when only one chilled water pump is in the lowest frequency operating state and the total average chilled water flow rate per unit mapping time is still less than 85% of the minimum flow rate corresponding to the lowest frequency.

[0021] In a third aspect, this application provides a computer-readable storage medium storing a computer program that enables a processor to implement the energy-saving control method described in this invention when executed.

[0022] In a fourth aspect, this application provides an electronic device comprising: a processor, a memory, and a computer program; the memory is communicatively connected to the processor, the memory stores the computer program, and the processor executes the computer program to implement the energy-saving control method of this invention.

[0023] As described above, the energy-saving control method, apparatus, equipment, and medium for a data center air conditioning chilled water system provided in this application acquires the real-time chilled water flow rate of each user in the air conditioning chilled water system in real time; obtains the average chilled water flow rate within a unit mapping time period based on the real-time chilled water flow rate data string of each user within that unit mapping time period; and obtains the sum of the average chilled water flow rates of all users within that unit mapping time period based on the average chilled water flow rates of each user within that unit mapping time period. The sum of the average chilled water flow rates within that unit mapping time period and the surplus flow rate is used as the supply and demand flow rate for the next unit mapping time period, thereby adjusting the operating frequency of the chilled water pump according to the supply and demand flow rate. This control method of this application can adjust the pump frequency in a timely manner according to the supply and demand flow rate, saving energy. Furthermore, the surplus flow rate can ensure the needs are met when user flow demand increases before the pump frequency is adjusted. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the control system in the existing technology of constant differential pressure control method for terminal trunk lines;

[0025] Figure 2 This is a schematic diagram of the control system in the existing technology of constant differential pressure control method for the initial trunk line;

[0026] Figure 3The diagram shows a flow chart of an embodiment of the energy-saving control method for an air conditioning chilled water system for a data center in this application.

[0027] Figure 4 This is a schematic diagram of flow control for each unit's mapped time period in one embodiment of this application;

[0028] Figure 5 The diagram shows an application scenario of the energy-saving control method for air conditioning chilled water systems in data centers according to this application in one embodiment;

[0029] Figure 6 This is a schematic diagram of a user's application scenario in another embodiment of the energy-saving control method for air conditioning chilled water systems in data centers according to this application;

[0030] Figure 7 This is a schematic diagram illustrating an application scenario of the energy-saving control method for an air conditioning chilled water system in a data center, as described in another embodiment of the present application, for a single room in a user's room.

[0031] Figure 8 This is a schematic diagram illustrating the application scenario of the energy-saving control method for the air conditioning chilled water system of a data center in another embodiment of the present application, specifically the air conditioning in a single room of a user.

[0032] Figure 9 The diagram shown is a structural schematic of an embodiment of the energy-saving control device for an air conditioning chilled water system for a data center in this application;

[0033] Figure 10 The diagram shown is a structural schematic of an electronic device according to an embodiment of this application. Detailed Implementation

[0034] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0035] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0036] Furthermore, as used herein, the singular forms “a,” “an,” and “the” are intended to include the plural forms as well, unless the context indicates otherwise. It should be further understood that the terms “comprising,” “including,” indicate the presence of the stated feature, operation, element, component, item, kind, and / or group, but do not preclude the presence, occurrence, or addition of one or more other features, operations, elements, components, items, kinds, and / or groups. The terms “or” and “and / or” as used herein are to be interpreted inclusively, or mean any one or any combination thereof.

[0037] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for explaining the present invention and are not intended to limit the invention.

[0038] In existing air conditioning chilled water systems, the commonly used main pipe constant pressure differential control regulates the pump frequency by maintaining a constant pressure differential in the main pipe, thereby controlling the water flow of the entire system. Depending on the location of the differential pressure sensor, it can be specifically divided into two types: the terminal main pipe constant pressure differential control method and the initial main pipe constant pressure differential control method. For details on the terminal main pipe constant pressure differential control method, please refer to [link to relevant documentation]. Figure 1 In this control method, the differential pressure sensor is set at the user's location to maintain a constant differential pressure on the end (user end) pipeline, thereby adjusting the flow rate as needed; for the constant differential pressure control method at the beginning of the main pipeline, please refer to... Figure 2 In this control method, the differential pressure sensor is located near the heat source and cold source, and the differential pressure on the starting main pipe is kept constant to achieve hydraulic balance control of the entire system. When using these two control methods: when the differential pressure increases, the pump frequency is reduced; when the differential pressure decreases, the pump frequency is increased.

[0039] However, in practical applications, because flow control needs to be based on changes in pressure differential, changes in user flow cannot be quickly reflected in the pressure differential, resulting in a certain lag. This leads to the system's inability to adjust the supply flow quickly, resulting in energy waste. Furthermore, since the entire system is controlled only by a constant pressure differential, the flow control is not precise enough. When the flow of individual users decreases, the entire system cannot adjust in time, causing excessive pump energy consumption and energy waste; conversely, when the flow of individual users suddenly increases, the entire system cannot adjust in time, resulting in insufficient supply.

[0040] To address the technical problems existing in the prior art, this application first provides an energy-saving control method for air conditioning chilled water systems in data centers. This method monitors the real-time chilled water flow of users, obtains the average chilled water flow within a unit mapping time period based on the real-time chilled water flow data string of each user within that unit mapping time period, and obtains the sum of the average chilled water flow of all users within that unit mapping time period based on the average chilled water flow of each user within that unit mapping time period. The sum of the average chilled water flow within that unit mapping time period and the surplus flow is used as the supply and demand flow for the next unit mapping time period, thereby ensuring that the supply and demand flow in the air conditioning chilled water system changes at unit mapping time intervals.

[0041] To facilitate understanding of the embodiments of this application, firstly, in conjunction with... Figure 3 Detailed explanation. Figure 3 A flowchart illustrating an energy-saving control method for an air conditioning chilled water system in a data center, according to an embodiment of the present invention, includes the following steps:

[0042] S11: Obtain the real-time chilled water flow rate for each user in the air conditioning chilled water system.

[0043] Wherein, the real-time chilled water flow rate of each user is the real-time chilled water flow rate passing through each user.

[0044] S12, obtain the average chilled water flow rate within the unit mapping time period based on the real-time chilled water flow rate data string of each user within the unit mapping time period.

[0045] Specifically, the average chilled water flow rate of each user within the unit mapping time period is obtained by averaging multiple real-time chilled water flow rates of each user within the unit mapping time period.

[0046] S13, based on the average chilled water flow rate of each user within the unit mapping time period, obtain the sum of the average chilled water flow rates of all users within the unit mapping time period.

[0047] Specifically, the average chilled water flow rate of each user within a unit mapping time period is summed to obtain the total average chilled water flow rate of all users within that unit mapping time period.

[0048] S14. The sum of the average chilled water flow rate and the surplus flow rate within the unit mapping time period shall be used as the supply and demand flow rate for the next unit mapping time period.

[0049] S15, in the next unit mapping time period, adjust the operating frequency of the chilled water pump based on the corresponding supply and demand flow rate.

[0050] The energy-saving control method for a data center air conditioning chilled water system provided in this embodiment acquires the real-time chilled water flow rate of each user in the air conditioning chilled water system in real time, obtains the average chilled water flow rate within the unit mapping time period based on the real-time chilled water flow rate data string of each user within the unit mapping time period, and obtains the sum of the average chilled water flow rates of all users within the unit mapping time period based on the average chilled water flow rates of each user within the unit mapping time period. The sum of the average chilled water flow rates within the unit mapping time period and the surplus flow rate is used as the supply and demand flow rate for the next unit mapping time period, thereby adjusting the operating frequency of the chilled water pump according to the supply and demand flow rate. Compared with the prior art, the control method in this application can effectively reduce the delay and imprecision caused by constant pressure difference control in the prior art while ensuring that user needs are met, and can greatly reduce the energy consumption of the water pump and reduce energy waste.

[0051] like Figure 4 The diagram shown illustrates the flow control for each unit's mapped time period in this embodiment. Figure 4 The horizontal axis represents the time axis, with each unit mapping time period being t. The sum of the average chilled water flow rate of all users in the first unit mapping time period and the sum of the surplus flow rate (Qt+△Q) is used as the supply and demand flow rate for the next unit mapping time period. The sum of the average chilled water flow rate of all users in the next time period and the sum of the surplus flow rate (Q2t+△Q) is used as the supply and demand flow rate for the next time period after that, and so on.

[0052] In a specific embodiment, the unit mapping time period is any fixed value between 10 and 180 seconds, such as 10-30 seconds, 30-60 seconds, 60-100 seconds, or 100-180 seconds. If the unit mapping time period is too long (e.g., 10 minutes), the supply and demand flow rate changes will take too long, failing to meet user needs in a timely manner. If the unit mapping time period is too short (e.g., 1 second or 3 seconds), the supply and demand flow rate changes will be too short, causing the entire air conditioning chilled water system to operate and change water flow too frequently, reducing system stability and increasing energy consumption. It should be noted that each unit mapping time period can also be manually set and adjusted. It can be determined based on the changes in the historical average total chilled water flow rate of all users. For example, the rate and magnitude of change in the historical average chilled water flow rate of all users within a similar time period can be adjusted. For example, a shorter or smaller unit mapping time period can be set if the change is rapid or the magnitude is large.

[0053] In a more specific embodiment, the unit mapping time period is specifically 30 seconds. The sum of the average chilled water flow rate of all users obtained in the previous 30 seconds and the surplus flow rate is taken as the actual supply and demand flow rate in the next 30 seconds.

[0054] Please see Figure 5 The diagram illustrates an application scenario of the energy-saving control method for an air conditioning chilled water system in a data center, as described in one embodiment. The air conditioning chilled water system includes users, flow meters, variable frequency pumps, chiller units, bypass valves, and a control center. The flow meters are installed on the chilled water pipelines of each user to monitor the real-time chilled water flow rate. The chiller units are connected to the variable frequency pumps to cool the water pumped out. The bypass valves are installed on the bypass pipelines of the air conditioning chilled water system. The control center serves as a monitoring platform, used to collect the real-time chilled water flow rate of each user and control the pump frequency to adjust the operating frequency of the chilled water pumps based on supply and demand flow rates. In some embodiments, the bypass valve is an integrated flow control valve.

[0055] In some alternative embodiments, the air conditioning chilled water system includes one or more users, with any one user connected in parallel with any other user based on chilled water piping.

[0056] In one specific embodiment, the user is a floor, a communication room unit, or a communication equipment unit.

[0057] If users are floors, then each floor user can also include one or more rooms.

[0058] In a more specific embodiment, such as Figure 6 As shown, taking a floor as an example, this floor contains two rooms, each containing several main units 603. A closed airflow channel 604 is provided between every two rows of main units. Each room also contains several air conditioners 605. The floor also includes a water supply pipe 602 and a return water pipe 601. The air supply temperature of each air conditioner is generally set to a constant temperature to meet the daily cooling needs of the room and to dissipate heat from the main units to ensure their normal operation. However, due to the heat generated by the main units, the resulting hot airflow enters the closed airflow channel 604, is then drawn into the air conditioner, and undergoes heat exchange and cooling through the chilled water pipes of the air conditioner, forming cold air at a constant temperature before being delivered again. Thus, the air conditioning system forms an air circulation, and the chilled water system forms a water circulation. The hot air in the air circulation is transformed into cold air at a constant temperature through the water circulation. Simultaneously, the chilled water in the water supply pipe 602, after its temperature is increased through heat exchange, enters the return water pipe 601 and further enters the chiller unit for cooling. The air circulation and water circulation interact to achieve a dynamic balance regulation effect.

[0059] In other embodiments, further with Figure 7Taking the water and air circulation in a single room as an example, the main unit's temperature rises due to data processing, etc. The air conditioner blows out cold air to provide a low-temperature environment to cool the main unit. The air blown out by the main unit is hot air. The hot air blown out by each main unit enters a closed channel. In the closed channel, the hot air is drawn into the air conditioner, exchanges heat with its corresponding chilled water pipes inside the air conditioner, and is then turned into cold air and sent out again, thus forming an air circulation between the main unit and the air conditioner. In addition, the corresponding chilled water pipes of the air conditioner, after heat exchange, become hot water and enter the hot water pipes. After being cooled by the chiller unit, it re-enters the chilled water pipes, thus forming a water circulation.

[0060] In some optional embodiments, the chiller unit is used to cool the water pumped out by the chilled water pump, and the temperature of the chilled water after being cooled by the chiller unit is any one of the determined values ​​between 15 and 18°C.

[0061] In a more specific embodiment, the chiller unit has a cooling water temperature of 16°C, such as... Figure 5 As shown, the temperature of the chilled water for air conditioning, cooled by the chiller unit, is constant at 16℃, meaning that the chilled water supply temperature for air conditioning flowing through each user is 16℃.

[0062] In some optional embodiments, the air conditioning chilled water system is equipped with a regulating valve at the user's location, and the air conditioner adjusts the valve opening in real time according to the supply and return air temperatures to ensure that the air conditioner operates at a constant set temperature for the user.

[0063] In one specific embodiment, please refer to Figure 8 Each air conditioner includes an independent CPU processor. A regulating valve 802 is installed on the chilled water pipe 801 corresponding to each air conditioner to control the chilled water flow rate of the corresponding air conditioner. A thermometer 803 is installed at the hot air intake of the air conditioner to measure the return air temperature in real time. The opening and closing degree of the regulating valve 802 is controlled by the air conditioner CPU processor to ensure that the supply air temperature after passing through the chilled water is a constant set value. The air conditioner CPU processor will automatically adjust the opening and closing degree of the regulating valve according to the real-time return air temperature.

[0064] In some optional embodiments, the constant supply air temperature is selected from any predetermined value between 21 and 23°C. The constant supply air temperature is set manually.

[0065] In some optional embodiments, the margin flow rate is 10~100m³. 3 Any specific value in / h.

[0066] In some optional embodiments, the reserve flow rate is fixed within a unit time period, and the reserve flow rate value for the next unit time period is set based on the variation range of the sum of real-time chilled water flow rates of each user within a similar historical time period. The reserve flow rate can be manually set based on the variation range of the sum of real-time chilled water flow rates of each user within a historical time period. This ensures that the required chilled water flow rate of the system users is always met, further saving energy consumption and avoiding the problem of high energy consumption caused by excessive supply, thereby achieving more precise energy saving.

[0067] In some embodiments of this application, the historical time period is 1 to 30 days, and the unit time period is 1 to 120 days.

[0068] In one specific embodiment, the reserve flow rate can vary every 3-5 days, 5-10 days, 20-30 days, or even every 6 months, etc.; it can be manually set according to actual needs. For more precise energy saving and to meet the changes in supply and demand flow rates caused by sudden changes in user demand (such as a sudden increase), the reserve flow rate can be considered to vary every 3-5 days. Meanwhile, in this application, "adjacent historical period" refers to the historical period immediately following the next period in which the reserve flow rate needs to be set. The operating status of the sum of real-time chilled water flow rates for each user within the adjacent historical period is used to determine how the reserve flow rate should be set in the next unit of time. Generally, historical periodicity is measured in days, such as several days, specifically 3-5 days, 5-10 days, 10-15 days, 15-20 days, etc.

[0069] When the number of client-side servers increases from 800 to 1000, the reserve flow rate needs to be reset. Specifically, when the client-side load changes, the reserve flow rate for the next time period should be set based on the variation in the sum of real-time chilled water flow rates for each user over a historical period (e.g., the previous 10-15 days). For example, the reserve flow rate can be set to a constant 50m³ for 3 days, 7 days, 1 month, 3 months, and 6 months. 3 / h; It can also be set that the remaining flow rate changes in a 1-day cycle within 3 days, 7 days, 1 month, 3 months, and 6 months, and set the corresponding remaining flow rate value for different times within 1 day. For example, it can be set that the supply and demand flow rate is obtained according to the corresponding set remaining flow rate value for different time periods each day for the next 3 days.

[0070] In one embodiment for obtaining the sum or magnitude of change of real-time chilled water flow rate of each user, the control center collects the sum of real-time chilled water flow rate of each user within the period. For example, the sum of real-time chilled water flow rate of each user is collected every 10 to 30 minutes as a collection point. This is done continuously, and the collection points are integrated to form a trend line, which is the trend line of change of the sum of real-time chilled water flow rate of each user within the period. The magnitude of change is obtained based on this trend line.

[0071] In another more specific embodiment, the control of the remaining flow rate within the next time period to follow the change within a set range is based on the changing trend of the sum of the real-time chilled water flow rates of each user within the cycle. The value of the remaining flow rate fluctuates continuously within the set range in the next unit time period. The specific fluctuation of the remaining flow rate value includes the following two specific implementation methods.

[0072] In the first embodiment, based on the changing trend of the sum of real-time chilled water flow rates for each user on the trend line (i.e., flow rate increases or decreases), the remaining flow rate in the next unit time period is controlled to increase or decrease. If the sum of real-time chilled water flow rates on the trend line increases within a unit time period, the control center controls the remaining flow rate value in the next unit time period to be within a set range (e.g., 10~100m). 3 If the sum of real-time chilled water flow rates per hour increases, it exceeds the residual flow rate value within the current unit time period; if the sum of real-time chilled water flow rates within a unit time period decreases on the trend line, the control center controls the residual flow rate value within the set range (e.g., 10~100m³) for the next unit time period. 3 The flow rate ( / h) decreases, meaning it becomes less than the remaining flow rate value within the current unit time period. The magnitude of this increase or decrease can be set, generally with small variations.

[0073] In the second embodiment, the set value of the reserve flow rate in the next unit time period is controlled based on the change range of the sum of the real-time chilled water flow rates of each user on the trend line (i.e., the magnitude of the increase or decrease in flow rate). Specifically, when the change range of the sum of flow rates is small, the value of the reserve flow rate is small, for example, it can be 10~30m³. 3 Any fixed value in / h; when the sum of the real-time chilled water flow rates of each user varies greatly, the value of the margin flow rate is relatively large, for example, it can be 50~100m³. 3 Any specific value in / h.

[0074] Either of the two methods described above for adjusting the reserve flow rate can ensure that the chilled water system always provides the required chilled water flow rate for the user. For example, if the flow rate demand of a user in the air conditioning chilled water system suddenly increases, i.e., the opening of the corresponding chilled water valve at the user's air conditioner increases, the sum of the actual flow rates increases, and the reserve flow rate will also increase accordingly (or take the larger value of the reserve flow rate based on the magnitude of the change). Ultimately, this results in a larger supply-demand flow rate, and the pump operating frequency is increased to meet this supply-demand flow rate.

[0075] In some alternative embodiments, the setting of the margin flow rate can also be controlled by the control center with reference to the above-described human-defined logic.

[0076] In another specific embodiment, the remaining flow rate is set by the control center, which controls the remaining flow rate value for the next time period based on the changing trend of the sum of the real-time flow rates of chilled water for each user on the trend line.

[0077] In one specific embodiment, when the operating frequency of the chilled water pump is adjusted based on the corresponding supply and demand flow rate in the next unit mapping time period, the control center calculates the current or voltage signal that the pump meets the demand in the next unit mapping time period based on the corresponding supply and demand flow rate in the next unit mapping time period. After receiving the current or voltage signal, the chilled water pump operates at the corresponding operating frequency to provide chilled water with the supply and demand flow rate into the air conditioning chilled water system.

[0078] In the cloud computing communication room or intelligent computing center scenarios involved in this application, because the air conditioners have automatic adjustment functions to ensure a constant air supply temperature, the water flow through each air conditioner changes in real time. Therefore, the water flow at the user end also changes in real time. Figure 5 As shown, the control center acquires the real-time chilled water flow rate of each user monitored by the flow meter, and calculates the average chilled water flow rate of each user within a unit mapping time period. Based on the average chilled water flow rate of each user, the control center calculates the sum of the average chilled water flow rates of all users within the unit mapping time period, and uses the sum of the average chilled water flow rates of all users and the corresponding surplus flow rate as the supply and demand flow rate for the next unit mapping time period. The control center calculates the supply and demand flow rate and converts the flow rate signal into a current or voltage signal. The current or voltage signal can directly correspond to the frequency value of the chilled water pump, thereby controlling and adjusting the operating frequency of the chilled water pump.

[0079] In some optional embodiments, the air conditioning chilled water system includes at least two chilled water pumps connected in parallel; the frequency and number of chilled water pumps in operation are controlled according to the supply and demand flow rate during the next mapping time period.

[0080] In one specific embodiment, the operating frequency and operating status of any chilled water pump are controlled by the control center, and the operating status refers to whether it is running or not running.

[0081] In one specific embodiment, when the supply and demand flow rate is so small that it can be met by the operating frequency of only one water pump: the control center controls one chilled water pump in the air conditioning chilled water system to operate, while the other chilled water pumps do not operate, and adjusts the operating frequency of the operating chilled water pump according to the supply and demand flow rate; the specific adjustment method of the operating frequency of the operating chilled water pump is as follows: when the calculated supply and demand flow rate of the next unit mapping time period is greater than the current water flow rate of the air conditioning chilled water system, the pump frequency of the next unit mapping time period is increased; when the calculated supply and demand flow rate of the next unit mapping time period is less than the current water flow rate of the air conditioning chilled water system, the chilled water pump frequency of the next unit mapping time period is decreased.

[0082] It should be noted that in actual operation, the energy consumption of a single chilled water pump is relatively high when the operating frequency is at its maximum. Therefore, when the operating frequency of the chilled water pump reaches more than 90% of the maximum operating frequency and has been running stably at this frequency for a certain period of time (e.g., 3 to 10 minutes), the number of pumps turned on should be increased to reduce the operating frequency of a single pump and save energy.

[0083] It should be noted that the rated frequency of a conventional water pump is 50Hz, and it is recommended that the maximum operating frequency be 2-5Hz lower than the rated frequency. In a specific embodiment, when the supply demand flow rate increases and the maximum operating frequency of one or more chilled water pumps is still insufficient: the control center will determine the operating frequency over a certain period of time. If it is determined that the operating frequency of the chilled water pumps is greater than 85% of the maximum operating frequency of the chilled water pumps during this period, then the number of chilled water pumps activated will be increased to meet the supply demand flow rate.

[0084] It is important to note that the safe operating frequency of a single chilled water pump is within the range of 20-30Hz. In actual operation, the minimum operating frequency of the chilled water pump is generally 2-5Hz higher than the safe operating frequency. In a specific embodiment, when the supply and demand flow is excessive, and the minimum operating frequency of multiple chilled water pumps still exceeds the supply and demand flow: the control center judges the operating frequency over a certain period of time. If it is determined that the operating frequency of the chilled water pumps is less than 1.2 times the minimum operating frequency within this period of time, the number of chilled water pumps in operation is reduced to meet the supply and demand balance. The minimum number of chilled water pumps in operation is greater than or equal to 1.

[0085] In some optional embodiments, the air conditioning chilled water system also includes a bypass pipeline, which is connected in parallel with any chilled water pipeline acting on the user. When only one chilled water pump is operating at its lowest frequency and the average total chilled water flow per unit mapping time is still less than 85% of the minimum flow rate corresponding to the lowest frequency, the bypass pipeline is connected to ensure the flow rate required for safe system operation. The bypass pipeline diverts excess chilled water flow, circulating water between the bypass pipeline and the chilled water pump, preventing damage caused by excessive pressure on the chilled water pipeline at the end user. In a more specific embodiment, the control center calculates the excess flow based on the difference between the demand flow and the actual supply flow, and controls the opening of the bypass valve on the bypass pipeline based on the excess flow. Specifically, a larger excess flow results in a larger bypass valve opening.

[0086] Those skilled in the art should note that for safe system operation, insufficient water flow through the chiller unit can lead to its inability to cool or even damage. Therefore, when the average total chilled water flow in the air conditioning chilled water system is too low, the bypass valve in the bypass line needs to be opened. This allows a portion of the water to circulate internally between the bypass line and the chiller unit line without flowing through the user's system, diverting excess flow and ensuring the required chilled water volume for safe system operation. Specifically, the opening range of the bypass valve in the bypass line is 0-20%. This is because when the bypass valve opening is too large, a large amount of chilled water will mix with the hot water return water flowing through the user's system, causing the return water temperature to drop accordingly. When the return water temperature drops too low (e.g., less than or equal to 17°C), it can cause the chiller unit to stop cooling or even be damaged.

[0087] In one specific embodiment, when a water pump in operation fails, the control center can also monitor the operating status of the chilled water pump in real time to determine whether it has failed. If it is determined that it has failed, it will control other chilled water pumps connected in parallel to operate in order to meet the system's flow requirements.

[0088] In this embodiment, the chilled water flow rate at each user terminal is automatically controlled by the air conditioning CPU. The air conditioner adjusts the opening of the regulating valve according to the return air temperature, so the water flow rate through each air conditioner changes in real time. The real-time chilled water flow rate at each user terminal is the sum of the water flow rates of several air conditioners at that user terminal. The frequency of the chilled water pump is automatically controlled by the control center, which adjusts the operating frequency of the chilled water pump according to the supply and demand flow rate. In this embodiment, the two fully automatic control systems, the user terminal air conditioning CPU and the control center, jointly control the chilled water system of the data center to achieve a balance between water supply and demand in the entire chilled water system and save energy.

[0089] In view of the technical problems existing in the prior art, this application also provides a control device for an air conditioning chilled water system for a data center.

[0090] Please see Figure 9 The control device for the air conditioning chilled water system includes: a real-time chilled water flow acquisition module 910, an average chilled water flow acquisition module 920, an average chilled water flow total acquisition module 930, a surplus flow adjustment module 940, a supply and demand flow acquisition module 950, and a control module 960.

[0091] The system includes: a real-time chilled water flow acquisition module 910, used to acquire the real-time chilled water flow of each user in the air conditioning chilled water system; an average chilled water flow acquisition module 920, used to acquire the average chilled water flow within a unit mapping time period based on the real-time chilled water flow data string of each user within that unit mapping time period; an average chilled water flow total acquisition module 930, used to acquire the total average chilled water flow of all users within that unit mapping time period based on the average chilled water flow of each user within that unit mapping time period; a surplus flow adjustment module, used to control the surplus flow to follow changes within a set range based on the changing trend of the sum of real-time chilled water flow of each user within a unit time period; a supply and demand flow acquisition module 950, used to use the sum of the average chilled water flow total and the surplus flow within the unit mapping time period as the supply and demand flow for the next unit mapping time period; and a control module 960, which includes at least a chilled water pump operating frequency control module, used to adjust the operating frequency of the chilled water pump based on the corresponding supply and demand flow in the next unit mapping time period.

[0092] In some optional embodiments, the control module 960 further includes a chilled water pump operating number control module 962 for controlling the number of chilled water pumps operating in the next mapped time period according to the supply demand flow rate to ensure that the supply demand flow rate is met.

[0093] In some optional embodiments, the control module 960 further includes a bypass pipeline control module 963, which controls the bypass pipeline to ensure the flow required for safe system operation when only one chilled water pump is in the lowest frequency operating state and the total average chilled water flow rate per unit mapping time is still less than 85% of the minimum flow rate corresponding to the lowest frequency.

[0094] In some optional embodiments, the real-time chilled water flow acquisition module 910 acquires the real-time water flow measured by a flow meter installed at the user end.

[0095] In some optional embodiments, the average chilled water flow acquisition module 920 is communicatively connected to the real-time chilled water flow acquisition module 910 to acquire the real-time chilled water flow of each user, and to calculate the average chilled water flow of each user within a unit mapping time by averaging the real-time chilled water flow of each user within that unit mapping time.

[0096] In some optional embodiments, the average chilled water flow acquisition module 930 is communicatively connected to the average chilled water flow acquisition module 920, and calculates the average chilled water flow of all users within the unit mapping time period by summing the average chilled water flow of each user within the unit mapping time period.

[0097] In some optional embodiments, the margin flow adjustment module 940 has a fixed value per unit time. The value of this margin flow can be set to a certain range, for example, considering ensuring that the demand is met without excessive waste or excessive water pipe pressure, it can be 10~100m. 3 / h. For example... Figure 9 As shown, the residual flow rate adjustment module 940 is communicatively connected to the average chilled water flow rate acquisition module 930. Based on the variation range of the sum of real-time chilled water flow rates of each user within a similar historical time period, it controls the residual flow rate value in the next unit time period.

[0098] In some optional embodiments, the supply and demand flow acquisition module 950 is communicatively connected to the average chilled water flow total acquisition module 930 and the surplus flow adjustment module 940. The supply and demand flow for the next unit mapping time period is obtained by summing the average chilled water flow total and surplus flow of all users within the current unit mapping time period.

[0099] In one specific embodiment, the control module 960 is the control center.

[0100] In a more specific embodiment, the control module 960 converts the supply demand flow signal into a corresponding current or voltage signal, which corresponds to a specific frequency of the chilled water pump. The information is then sent to the chilled water pump operating frequency control module 961, the chilled water pump operating number control module 962, and the bypass pipeline control module 963, thereby controlling and adjusting the frequency of the chilled water pump, the operating number of the chilled water pump, and the valve opening of the bypass pipeline to ensure the flow demand of each user end while also ensuring the safe and stable operation of the system.

[0101] This embodiment also provides a computer-readable storage medium storing a computer program thereon, which, when called by a processor, implements the control method for the air conditioning chilled water system provided by the present invention.

[0102] A computer-readable storage medium can be a tangible device capable of holding and storing instructions used by an instruction execution device. Computer-readable storage media can be, for example, (but not limited to) electrical storage devices, magnetic storage devices, optical storage devices, electromagnetic storage devices, semiconductor storage devices, or any suitable combination thereof. More specific examples (a non-exhaustive list) of computer-readable storage media include: portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static random access memory (SRAM), portable compact disc read-only memory (CD-ROM), digital multifunction disc (DVD), memory sticks, floppy disks, and mechanical encoding devices.

[0103] The computer-readable program described herein can be downloaded from a computer-readable storage medium to various computing / processing devices, or downloaded via a network, such as the Internet, a local area network, a wide area network, and / or a wireless network, to an external computer or external storage device. A network adapter card or network interface in each computing / processing device receives computer-readable program instructions from the network and forwards these instructions to the computer-readable storage medium in the respective computing / processing device.

[0104] Please see Figure 10 This embodiment provides a schematic diagram of the structure of an electronic device for implementing the above-mentioned energy-saving control method for air conditioning chilled water system. The electronic device described in this invention refers to a computer used for data processing and communication.

[0105] like Figure 10 As shown, the electronic device of the present invention includes at least one memory 120, at least one processor 130, and a computer program stored on the memory 120 and executable on the processor 130. A communication interface 110 is used for communication between the memory 120 and the processor 130. The processor 130 may be a dedicated or general-purpose programmable processor. The computer program may be written using any combination of one or more programming languages. The computer program may be executed entirely on the machine, partially on the machine, partially on the machine and partially on a remote machine as a standalone software package, or entirely on a remote machine or server.

[0106] It should be noted that the division of the various modules in the above device is merely a logical functional division. In actual implementation, they can be fully or partially integrated into a single physical entity, or they can be physically separated. Furthermore, these modules can be implemented entirely in software through processing element calls, entirely in hardware, or some modules can be implemented in software through processing element calls, while others are implemented in hardware.

[0107] In summary, this invention effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0108] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. An energy-saving control method for an air conditioning chilled water system in a data center, characterized in that, include: The system acquires the real-time chilled water flow rate for each user in the air conditioning chilled water system, wherein the air conditioning chilled water system includes a chilled water pump. The average chilled water flow rate within a unit mapping time period is obtained based on the real-time chilled water flow rate data string of each user within that unit mapping time period. Based on the average chilled water flow rate of each user within a unit mapping time period, obtain the sum of the average chilled water flow rates of all users within that unit mapping time period; The sum of the average chilled water flow rate within the unit mapping time period and the set margin flow rate is used as the supply and demand flow rate for the next unit mapping time period. The margin flow rate is fixed within the unit time period, and the margin flow rate value for the next unit time period is set based on the variation range of the sum of the real-time chilled water flow rates of each user within a similar historical time period. In the next unit mapping time period, the operating frequency of the chilled water pump is adjusted based on the corresponding supply and demand flow rate; The unit mapping time period is 10–180 seconds; The remaining flow rate is 10-100 m³ / h. 3 / h; The air conditioning chilled water system includes one or more users, and any one user and any other user are connected in parallel based on the chilled water pipeline; The user is a floor, a communication equipment room unit, or a communication equipment unit.

2. The energy-saving control method according to claim 1, characterized in that, The air conditioning chilled water system is equipped with a regulating valve at the user's location. The air conditioner controls the valve opening in real time according to the supply and return air temperatures to ensure that the air conditioner operates at a constant set temperature for the user.

3. The energy-saving control method according to claim 1, characterized in that, The historical time period is 1 to 30 days; and / or the unit time period is 1 to 120 days.

4. The energy-saving control method according to claim 1, characterized in that, The air conditioning chilled water system includes at least two chilled water pumps connected in parallel; the operating frequency and / or number of chilled water pumps in the next mapping time period are controlled according to the supply and demand flow rate to ensure that the supply and demand flow rate is met.

5. The energy-saving control method according to claim 1, characterized in that, The air conditioning chilled water system also includes a bypass pipeline, which is connected in parallel with any chilled water pipeline acting on the user. When only one chilled water pump is operating at its lowest frequency and the total average chilled water flow rate per unit mapping time is still less than 85% of the minimum flow rate corresponding to the lowest frequency, the bypass pipeline is connected to ensure the flow rate required for safe system operation.

6. A control device for an air conditioning chilled water system in a data center, characterized in that, The air conditioning chilled water system includes a chilled water pump and one or more users, with any one user connected in parallel with another user via chilled water piping; the user is a floor, a communication equipment room unit, or a communication equipment unit; including: The real-time chilled water flow acquisition module is used to acquire the real-time chilled water flow of each user in the air conditioning chilled water system; The average chilled water flow rate acquisition module is used to obtain the average chilled water flow rate within a unit mapping time period based on the real-time chilled water flow rate data string of each user within that unit mapping time period. The average chilled water flow total acquisition module is used to obtain the average chilled water flow total of all users within a unit mapping time period based on the average chilled water flow of each user within that unit mapping time period; the supply and demand flow acquisition module is used to use the sum of the average chilled water flow total within the unit mapping time period and the set margin flow as the supply and demand flow for the next unit mapping time period. The chilled water pump operating frequency control module is used to adjust the operating frequency of the chilled water pump based on the corresponding supply and demand flow rate within the next unit mapping time period; the unit mapping time period is 10-180s; the surplus flow rate adjustment module is used to control the surplus flow rate to follow the change trend of the sum of real-time chilled water flow rates of each user within the unit time period, and the surplus flow rate is 10-100m³. 3 / h.

7. The control device according to claim 6, characterized in that, The control device further includes a chilled water pump operating number control module, used to control the number of chilled water pumps operating in the next mapping time period according to the supply demand flow rate to ensure that the supply demand flow rate is met; and / or, the control device further includes a bypass pipeline control module, used to control the bypass pipeline to ensure the flow rate required for safe system operation when only one chilled water pump is in the lowest frequency operating state and the average total chilled water flow rate per unit mapping time is still less than 85% of the minimum flow rate corresponding to the lowest frequency.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that enables a processor to implement the energy-saving control method as described in any one of claims 1 to 5 when executed.

9. An electronic device, characterized in that, The electronic device includes: a processor, a memory, and a computer program; the memory is communicatively connected to the processor, the memory stores the computer program, and the processor executes the computer program to implement the energy-saving control method as described in any one of claims 1 to 5.

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