Energy-saving control method, device and equipment for air conditioner chilled water system of data center and medium

Abstract

The invention provides an energy-saving control method, device and equipment for an air conditioner chilled water system of a data center and a medium. The control method comprises the steps that the real-time chilled water flow of each user in the air conditioner chilled water system is obtained; wherein the air conditioner chilled water system comprises a chilled water pump; based on the real-time chilled water flow data string of each user in the unit mapping time period, the average chilled water flow in the unit mapping time period is obtained; based on the average chilled water flow of each user in the unit mapping time period, obtaining the sum of the average chilled water flow of all users in the unit mapping time period; the sum of the average chilled water flow sum in the unit mapping time period and the set allowance flow is used as the supply demand flow in the next unit mapping time period; in the next unit mapping time period, the working frequency of the chilled water pump is adjusted based on the corresponding supply demand flow; according to the method, water flow supply can be accurately controlled in time, and energy consumption is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of heating and ventilation, and relates to a control method for an air-conditioning chilled water system, and in particular to an energy-saving control method based on an air-conditioning chilled water system for a data center. Background Art

[0002] There are two methods for speed control of water pumps in current air-conditioning chilled water systems: constant pressure difference and variable pressure difference control. Variable pressure difference control requires setting pressure sensors at each end, comparing and finding the most unfavorable end pressure difference at any time, and adjusting the water pump speed according to its value. Therefore, the investment is relatively high, the control logic is cumbersome and prone to errors and loss of control, and the implementation is also difficult. In the actual implementation process, variable pressure difference control is rarely used, and constant pressure difference control is basically adopted; in the actual application of constant pressure difference control, according to the different settings of the pressure difference sensor, it is divided into terminal dry pipe constant pressure difference control and starting dry pipe constant pressure difference control. When the starting dry pipe constant pressure difference control system is running, the system flow control needs to be greater than the terminal demand flow, which makes it difficult to achieve a complete match between supply and demand, and there is energy waste. Second, the fault tolerance rate of the constant pressure difference of the starting dry pipe is low, and the risk of system loss of control is high. In the actual application process, when the most unfavorable loop is clearly defined, the constant pressure difference control of the terminal dry pipe is more energy-efficient than the constant pressure difference control of the starting dry pipe. However, the use of the terminal main constant pressure difference control method, first, the terminal main constant pressure control target is set according to the full power safe operation pressure difference of the air conditioner, and its safe operation pressure difference is usually 400-800KPa. On this basis, 200-400KPa is increased as the system constant pressure control target setting, and the flow supply target is greatly magnified, and energy consumption is difficult to effectively control; second, the most unfavorable constant pressure difference sensor is generally installed at the highest point at the end. The most unfavorable point of the system is not the highest point where the user's power consumption is large or the power consumption changes greatly. The most unfavorable constant pressure control at the end is difficult to take into account the user's global flow demand and changes. Third, when the flow demand of a certain user changes and the branches of other users are not adjusted, the available pressure heads of other users are relatively stable, and the system delay of the changing user needs to increase. The farther away from the control point, the less real the most unfavorable constant pressure difference detection is, and the longer the detection delay is.

[0003] In practical applications, neither the constant pressure difference control of the terminal main pipe nor the constant pressure difference control of the starting main pipe can finely control the flow supply and demand of the system. Both have a certain lag, that is, the flow changes of other users cannot be quickly reflected in the pressure difference, resulting in the system being unable to change the flow delivery in time, insufficient control accuracy, and causing power waste. Summary of the invention

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

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

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

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

[0008] In some implementations of the first aspect of the present application, the unit mapping time period is 10 to 180 seconds. In the present application, the unit mapping time period may be any specific value between 10 and 180 seconds.

[0009] In some embodiments of the first aspect of the present application, the residual flow rate is 10-100m 3 / h, in this application, the residual flow rate can be 10~100m 3 / h is any specific value.

[0010] In some implementations of the first aspect of the present application, the air-conditioning chilled water system includes one or more users, and any one user is connected in parallel with any other user based on a chilled water pipeline.

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

[0012] In some embodiments of the first aspect of the present application, the surplus flow is fixed within a unit time period, and the surplus flow value within the next unit time period is set based on the change amplitude of the sum of the real-time chilled water flow of each user in a similar historical time period, so as to save more energy while meeting the flow requirements of users in the air-conditioning chilled water system.

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

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

[0015] In some embodiments of the first aspect of the present application, the air-conditioning chilled water system includes at least two chilled water pumps connected in parallel; the operating frequency and / or the number of operating units of the chilled water pumps in the next mapping time period are controlled according to the supply demand flow to ensure that the supply demand flow is met; when the supply demand flow is small and only the operating frequency of one water pump can be met, the water pump frequency is controlled according to the supply demand flow; when the supply demand flow is large and the highest operating frequency of one water pump still cannot be met, the number of water pumps that are turned on is controlled to increase to ensure that the supply demand flow is met.

[0016] In some embodiments of the first aspect of the present application, the air-conditioning chilled water system also includes a bypass pipeline, which is arranged in parallel with any chilled water pipeline serving the user; when only one chilled water pump is in the lowest frequency working state and the sum of the average chilled water flow rates within the 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 operation of the system.

[0017] In a second aspect of the present application, a control device for an air-conditioning chilled water system in a data center is provided, including: a real-time chilled water flow acquisition module, 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, used to acquire the average chilled water flow in a unit mapping time period based on the real-time chilled water flow data string of each user in the unit mapping time period; an average chilled water flow sum acquisition module, used to acquire the average chilled water flow sum of all users in the unit mapping time period based on the average chilled water flow of each user in the unit mapping time period; a supply demand flow acquisition module, used to use the sum of the average chilled water flow sum in the unit mapping time period and the set surplus flow as the supply demand flow in the next unit mapping time period; a chilled water pump operating frequency control module, used to adjust the operating frequency of the chilled water pump based on the corresponding supply demand flow in the next unit mapping time period.

[0018] In some implementations of the second aspect of the present application, the control device further includes a surplus flow regulating module for controlling the surplus flow to change within a set range based on a change trend of the sum of the real-time chilled water flow of each user within a unit time period.

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

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

[0021] In a third aspect of the present application, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores a computer program, and the computer program is used to enable a processor to implement the energy-saving control method described in the present invention when executed.

[0022] In a fourth aspect of the present application, an electronic device is provided, 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 described in the present invention.

[0023] As described above, the energy-saving control method, device, equipment and medium of the air-conditioning chilled water system for a data center provided by the present application obtains the real-time chilled water flow of each user in the air-conditioning chilled water system in real time, obtains the average chilled water flow in the unit mapping time period based on the real-time chilled water flow data string of each user in the unit mapping time period; and obtains the sum of the average chilled water flow of all users in the unit mapping time period based on the average chilled water flow of each user in the unit mapping time period, and uses the sum of the average chilled water flow in the unit mapping time period and the surplus flow as the supply demand flow in the next unit mapping time period, thereby adjusting the working frequency of the chilled water pump according to the supply demand flow. This control method of the present application can timely adjust the frequency of the water pump according to the supply demand flow, saving energy consumption. In addition, the surplus flow can ensure the need when the user flow demand increases before the water pump frequency conversion. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of a control system in a terminal main pipe constant pressure difference control method in the prior art;

[0025] Figure 2 It is a schematic diagram of a control system in a start-end main pipe constant pressure difference control method in the prior art;

[0026] Figure 3Shown is a flow chart of an energy-saving control method for an air-conditioning chilled water system in a data center in one embodiment of the present application;

[0027] Figure 4 Shown is a schematic diagram of flow control for each unit mapping time period in an embodiment of the present application;

[0028] Figure 5 Shown is a schematic diagram of an application scenario of an energy-saving control method for an air-conditioning chilled water system in a data center according to the present application in one embodiment;

[0029] Figure 6 Shown is a schematic diagram of an application scenario of a user in another embodiment of the energy-saving control method for an air-conditioning chilled water system of a data center of the present application;

[0030] Figure 7 Shown is a schematic diagram of an application scenario of a single room in a user in another embodiment of the energy-saving control method for an air-conditioning chilled water system of a data center of the present application;

[0031] Figure 8 Shown is a schematic diagram of an application scenario of a specific air conditioner in a single room of a user in another embodiment of the energy-saving control method of the air conditioning chilled water system of a data center of the present application;

[0032] Fig. 9 Shown is a schematic structural diagram of an energy-saving control device for an air-conditioning chilled water system of a data center in the present application in one embodiment;

[0033] Fig.10 Shown is a schematic diagram of the structure of an electronic device in an embodiment of the present application. DETAILED DESCRIPTION

[0034] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0035] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[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 "comprises", "includes", "includes" indicate the presence of the described features, operations, elements, components, items, types, and / or groups, but do not exclude the presence, occurrence, or addition of one or more other features, operations, elements, components, items, types, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination.

[0037] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the technical solution in the embodiments of the present invention is further described in detail through the following embodiments and in combination with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the invention.

[0038] The common dry pipe constant pressure difference control in the existing air conditioning chilled water system is to adjust the water pump frequency by maintaining a constant pressure difference in the dry pipe, thereby controlling the water flow of the entire system; according to the different locations of the pressure difference sensor, it can be specifically divided into two types: the terminal dry pipe constant pressure difference control method and the starting dry pipe constant pressure difference control method. Specifically, the terminal dry pipe constant pressure difference control method can be found in Figure 1 In this control method, the differential pressure sensor is set at the user to keep the differential pressure on the terminal (user end) pipeline constant, so as to adjust the flow rate according to the needs; the constant differential pressure control method of the starting main pipe can be found in Figure 2 In this control method, the differential pressure sensor is located near the cold and hot sources, and the differential pressure on the starting main pipe is kept constant to achieve hydraulic balance control of the entire system. When these two control methods are used: when the differential pressure increases, the pump frequency is reduced; when the differential pressure decreases, the pump frequency is increased.

[0039] However, in actual applications, since the flow rate needs to be controlled according to the change in pressure difference, the flow rate change of users in the system cannot be quickly reflected in the pressure difference, so there is a certain lag, which causes the system to be unable to quickly adjust the supply flow rate, resulting in energy waste. In addition, since the overall system is only controlled by a constant pressure difference, the flow control of the entire system is not refined enough. When the flow rate of individual users decreases, the entire system cannot be adjusted in time, resulting in excessive energy consumption of the water pump and energy waste; when the flow rate of individual users suddenly increases, the entire system cannot be adjusted in time, resulting in insufficient supply.

[0040] In response to the technical problems existing in the prior art, the present application first provides an energy-saving control method for an air-conditioning chilled water system in a data center, which is used to monitor the real-time chilled water flow of users, obtain the average chilled water flow in the unit mapping time period based on the real-time chilled water flow data string of each user in the unit mapping time period, and obtain the sum of the average chilled water flow of all users in the unit mapping time period based on the average chilled water flow of each user in the unit mapping time period, and use the sum of the average chilled water flow in the unit mapping time period and the surplus flow as the supply demand flow in the next unit mapping time period, thereby ensuring that the supply demand flow in the air-conditioning chilled water system changes at intervals of the unit mapping time period.

[0041] In order to facilitate understanding of the embodiments of the present application, first Figure 3 Detailed description. Figure 3 A flow chart of an energy-saving control method for an air-conditioning chilled water system in a data center according to an embodiment of the present invention is shown, comprising the following steps:

[0042] S11, obtaining the real-time chilled water flow of each user in the air-conditioning chilled water system.

[0043] The real-time chilled water flow rate of each user is the real-time chilled water flow rate flowing through each user.

[0044] S12: acquiring an 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 value of multiple real-time chilled water flow rates of each user obtained within the unit mapping time period is taken, that is, the average chilled water flow rate of each user within the unit mapping time period is obtained.

[0046] S13, based on the average chilled water flow of each user in the unit mapping time period, obtaining the sum of the average chilled water flow of all users in the unit mapping time period.

[0047] Specifically, the average chilled water flow of each user in the unit mapping time period is summed up, that is, the sum of the average chilled water flow of all users in the unit mapping time period is obtained.

[0048] S14, taking the sum of the average chilled water flow rate and the surplus flow rate in the unit mapping time period as the supply demand flow rate in the next unit mapping time period.

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

[0050] The energy-saving control method for the air-conditioning chilled water system for the data center provided in the present embodiment obtains the real-time chilled water flow of each user in the air-conditioning chilled water system in real time, and obtains the average chilled water flow in the unit mapping time period based on the real-time chilled water flow data string of each user in the unit mapping time period; and obtains the sum of the average chilled water flow of all users in the unit mapping time period based on the average chilled water flow of each user in the unit mapping time period, and uses the sum of the average chilled water flow in the unit mapping time period and the surplus flow as the supply demand flow in the next unit mapping time period, thereby adjusting the operating frequency of the chilled water pump according to the supply demand flow; compared with the prior art, the control method in the present application can effectively reduce the delay and unrefinedness caused by the 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 As shown, it is a schematic diagram of flow control of each unit mapping time period in this embodiment. Figure 4 The middle horizontal axis is the time axis, the unit mapping time period is t, and the sum of the average chilled water flow of all users and the sum of the surplus flow (Qt+△Q) in the first unit mapping time period is used as the supply and demand flow of the next unit mapping time period; the sum of the average chilled water flow of all users in the next time period and the sum of the surplus flow (Q2t+△Q) is used as the supply and demand flow of the next time period, and so on.

[0052] In a specific embodiment, the unit mapping time period is any determined value in the range of 10 to 180 seconds, such as 10 to 30 seconds, 30 to 60 seconds, 60 to 100 seconds, or 100 to 180 seconds. When the unit mapping time period is too long (such as 10 minutes), the supply and demand flow rate change time will be too long, and the user's needs cannot be met in time; when the unit mapping time period is too short (such as 1 second, 3 seconds), the supply and demand flow rate change time will be too short, causing the entire air-conditioning chilled water system to calculate and change the water flow too frequently, resulting in a reduction in the system stability index and high energy consumption. It should be noted that each unit mapping time period can also be manually set and adjusted, and can be determined based on the change in the average total chilled water flow of all users' histories, such as the change speed and change range of the average total chilled water flow of all users' histories at similar times. If the change is fast or the change range is large, a shorter or smaller unit mapping time period can be set.

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

[0054] See also Figure 5 , a schematic diagram of an application scenario of the energy-saving control method for the air-conditioning chilled water system of a data center in one embodiment is shown; the air-conditioning chilled water system includes users, flow meters, variable frequency water pumps, chillers, bypass valves and a control center; the flow meters are arranged on the chilled water pipelines of each user to monitor the real-time chilled water flow of each user, the chillers are connected to the variable frequency water pumps to refrigerate the water pumped out by the water pumps, the bypass valves are arranged on the bypass pipelines of the air-conditioning chilled water system, and the control center is used as a monitoring platform to collect the real-time chilled water flow of each user and control the pump frequency to adjust the working frequency of the chilled water pump based on the supply demand flow. In some embodiments, the bypass valve is a flow-integrated control valve.

[0055] In some optional embodiments, the air-conditioning chilled water system includes one or more users, and any one user is connected in parallel with any other user based on a chilled water pipeline.

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

[0057] If the user is a floor, each floor user can also contain one or more rooms.

[0058] In a more specific embodiment, Figure 6 As shown, a floor is taken as an example of a user. The floor contains two rooms, each of which contains several working hosts 603. There is an air-tight passage 604 between every two rows of hosts. Each room also contains several air conditioners 605. The floor also contains a water supply pipe 602 and a water return 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 for the host to ensure that the host can operate normally. However, due to the heat dissipation of the host, the hot air flow formed enters the air-tight passage 604, and then is sucked in by the air conditioner and cooled by heat exchange through the chilled water pipe at the air conditioner, forming cold air with a set constant temperature and then sent out again. As a result, the air conditioning system forms an air cycle, and the air conditioning chilled water system forms a water cycle. The hot air in the air cycle is converted into cold air with a set constant temperature through the water cycle. At the same time, the chilled water in the water supply pipe 602 in the water cycle enters the water return pipe 601 after the temperature is increased by heat exchange, and further enters the chiller for refrigeration. The air cycle and the water cycle interact with each other to achieve a dynamic balance adjustment effect.

[0059] In some other embodiments, further Figure 7Taking the water circulation and air circulation of a single room as an example, the temperature of the working host increases due to data calculations, and the air conditioner blows out cold air to provide a low-temperature environment to cool the working host. The air blown out of the working host is hot air. The hot air blown out of each working host enters the closed channel. The hot air in the closed channel is sucked into the air conditioner, and after heat exchange with the corresponding chilled water pipe inside the air conditioner, it is turned into cold air and sent out again, thus forming an air circulation between the host and the air conditioner. In addition, the cold water pipe corresponding to the air conditioner forms hot water after heat exchange and enters the hot water pipe, and then enters the cold water pipe again after being cooled by the chiller, thus forming a water circulation.

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

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

[0062] In some optional embodiments, the air conditioning chilled water system is provided with a regulating valve at the user's location, and the air conditioner adjusts 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.

[0063] In a specific embodiment, see Figure 8 Each of the air conditioners includes an independent CPU processor, and a regulating valve 802 is provided on the chilled water pipe 801 corresponding to each of the air conditioners to control the chilled water flow corresponding to the air conditioner. A thermometer 803 is provided at the hot air inlet of the air conditioner to measure the return air temperature in real time; the valve opening and closing degree of the regulating valve 802 is controlled by the CPU processor of the air conditioner so that the supply air temperature after passing through the chilled water is a constant set value, and the CPU processor of the air conditioner 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 air supply temperature is selected from any certain value between 21° C. and 23° C. The constant air supply temperature is artificially set.

[0065] In some optional embodiments, the residual flow is 10-100m 3 / h is any specific value.

[0066] In some optional embodiments, the surplus flow is fixed within a unit time period, and the surplus flow value within the next unit time period is set based on the change range of the sum of the real-time chilled water flow of each user in a similar historical time period. The surplus flow can be set manually, and the surplus flow is set based on the change range of the sum of the real-time chilled water flow of each user in a historical time period to ensure that the chilled water flow required by the system users can always be met, further saving energy consumption, avoiding the problem of high energy consumption caused by excessive supply, and thus achieving more accurate energy saving.

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

[0068] In a specific embodiment, the surplus flow rate can change once every 3 to 5 days, once every 5 to 10 days, once every 20 to 30 days, once every 6 months, etc.; it can be manually set according to actual needs. In order to save energy more accurately and meet the changes in supply and demand flow caused by sudden changes in user demand (such as sudden increase), it can be considered that the surplus flow rate changes once in a unit time period of 3 to 5 days. At the same time, the similar historical cycle time period in this application refers to the historical time period closely adjacent to the next time period to set the surplus flow rate, so as to judge how to set the surplus flow rate in the next unit time period by the operating conditions of the sum of the real-time chilled water flow rates of each user in the closely adjacent historical time period. Generally speaking, the historical time period is measured in days, such as a few days, which can be 3 to 5 days, 5 to 10 days, 10 to 15 days, 15 days to 20 days, etc.

[0069] When the number of working hosts at the user end increases from 800 to 1000, it is necessary to reset the value of the surplus flow. That is, when the user-side load changes, the surplus flow value in the next unit time period is set according to the change range of the sum of the real-time chilled water flow of each user in the historical time period (such as the previous 10 to 15 days). For example, the surplus flow can be set to a constant 50m for 3 days, 7 days, 1 month, 3 months, and 6 months. 3 / h; you can also set the surplus flow rate within 3 days, 7 days, 1 month, 3 months, and 6 months to change according to 1 day as a cycle, and set corresponding surplus flow values ​​at different times within 1 day, such as setting the supply demand flow rate according to the corresponding set surplus flow values ​​at different time periods every day for the next 3 days.

[0070] In an embodiment of obtaining the change amplitude or change amplitude of the sum of the real-time chilled water flow rates of each user, the control center collects the sum of the real-time chilled water flow rates of each user within the period, for example, the sum of the real-time chilled water flow rates of each user is collected once every 10 to 30 minutes as a collection point, and continuous collection is performed, and each collection point is integrated to form a trend line to obtain the change trend line of the sum of the real-time chilled water flow rates of each user within the period, and the change amplitude is obtained based on the change trend line.

[0071] In another more specific embodiment, the control of the surplus flow in the next time period follows the change within the set range according to the change trend of the sum of the real-time chilled water flow of each user in the cycle, and the value of the surplus flow in the next unit time period fluctuates continuously within the set range, and the fluctuation of the specific surplus flow value includes the following two specific implementation methods.

[0072] The first one, in this embodiment, is based on the change trend of the sum of the real-time chilled water flow of each user on the trend line (i.e., flow increase or decrease), and controls the surplus flow in the next unit time period to increase or decrease. If the sum of the real-time chilled water flow in the unit time period on the trend line increases, the control center controls the surplus flow value in the next unit time period to be within the set range (e.g., 10~100m 3 / h) increases, that is, it is greater than the remaining flow value in the current unit time period; if the sum of the real-time chilled water flow in the unit time period on the trend line decreases, the control center controls the remaining flow value in the next unit time period to be within the set range (such as 10~100m 3 / h) decreases, that is, it is less than the residual flow value in the current unit time period. The increase and decrease range of this margin can be set, and generally small changes are the main ones.

[0073] The second method, in this embodiment, is to control the value of the set value of the surplus flow in the next unit time period based on the change amplitude of the sum of the real-time chilled water flow of each user on the trend line (i.e., the amplitude of flow increase or decrease). Specifically, when the change amplitude of the sum of flow is small, the value of the surplus flow is small, for example, it can be 10~30m 3 / h; when the sum of the real-time chilled water flow rates of each user varies greatly, the value of the surplus flow rate is larger, for example, it can be 50~100m 3 / h is any specific value.

[0074] Any of the above two surplus flow following change modes can ensure that the chilled water system can always provide chilled water flow that meets the needs of users. For example, when the demand flow of a certain user in the air-conditioning chilled water system suddenly increases, that is, the opening of the chilled water valve corresponding to the user-side air conditioner increases, at this time, the sum of the actual flow increases, and the surplus flow also increases (or takes a larger surplus flow according to the change amplitude), which eventually leads to an increase in the supply demand flow, and the water pump operating frequency is controlled to meet the supply demand flow by increasing the water pump operating frequency.

[0075] In some optional embodiments, the setting of the surplus flow rate may also be controlled by a control center by forming software with reference to the above-mentioned artificial setting logic.

[0076] In another specific embodiment, the surplus flow is set by a control center, and the control center controls the surplus flow value in the next time period according to the change trend of the sum of the real-time flow of chilled water of each user on the trend line.

[0077] In a specific embodiment, during the next unit mapping time period, when the operating frequency of the chilled water pump is adjusted based on the corresponding supply demand flow rate, the control center calculates the current or voltage signal for the water pump to meet the demand during the next unit mapping time period based on the corresponding supply demand flow rate during 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 a supply demand flow rate into the air-conditioning chilled water system.

[0078] In the scenario of the cloud computing communication room or intelligent computing center involved in this application, since the air conditioner has an automatic adjustment function to ensure that its air supply temperature is constant, the water flow through each air conditioner changes in real time, so the water flow at the user end changes in real time, such as Figure 5 As shown, the control center obtains the real-time chilled water flow of each user monitored by the flow meter, and calculates the average chilled water flow of each user in the unit mapping time period, calculates the sum of the average chilled water flow of all users in the unit mapping time period based on the average chilled water flow of each user, and takes the sum of the average chilled water flow of all users and the corresponding surplus flow as the supply demand flow in the next unit mapping time period; the control center obtains the supply demand flow by calculation, and converts the flow signal into a current or voltage signal, which 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 the number of operating chilled water pumps in the next mapping time period are controlled according to the supply demand flow.

[0080] In a specific embodiment, the operating frequency and operating state of any chilled water pump are controlled by the control center, and the operating state refers to running or not running.

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

[0082] It should be noted that in actual work, the energy consumption of a single chilled water pump is higher when the operating frequency is at the highest operating frequency; therefore, when the operating frequency of the chilled water pump reaches more than 90% of the highest operating frequency and runs stably at this frequency for a certain period of time (for example, 3 to 10 minutes), the number of pumps that are turned on is controlled to increase in order to reduce the operating frequency of a single water pump and save energy.

[0083] It should be noted that the rated frequency of a conventional water pump is 50Hz, and the recommended maximum operating frequency is 2~5Hz less than the rated frequency. In a specific embodiment, when the supply demand flow increases, and the maximum operating frequency of one or more chilled water pumps cannot meet the demand: the control center determines the operating frequency within a certain period of time. If it is determined that the operating frequency of the chilled water pump is greater than 85% of the maximum operating frequency of the chilled water pump within the period of time, the control center increases the number of chilled water pumps to be turned on to meet the supply demand flow.

[0084] It should be noted that the safe operating frequency of a single chilled water pump is within the range of 20-30 Hz. In actual operation, the minimum operating frequency of the chilled water pump is generally 2-5 Hz greater than the safe operating frequency. In a specific embodiment, when the supply demand flow is in excess, and the minimum operating frequency of multiple chilled water pumps still exceeds the supply demand flow: the control center determines its operating frequency within a certain period of time. If it is determined that the operating frequency of the chilled water pump is less than 1.2 times the minimum operating frequency within the period of time, the control center reduces the number of chilled water pumps that are turned on to meet the supply and demand balance. The minimum number of running chilled water pumps 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 arranged in parallel with any chilled water pipeline acting on the user; when only one chilled water pump is in the lowest frequency working state and the average sum of the chilled water flow in the unit mapping time is still less than 85% of the minimum flow corresponding to the lowest frequency, the bypass pipeline is controlled to be connected to ensure the flow required for safe operation of the system. The bypass pipeline is connected to divide the excess chilled water flow, and the water circulation between the bypass pipeline and the chilled water pump is carried out to avoid damage caused by excessive pressure on the chilled water pipeline at the end user end. In a more specific embodiment, the control center calculates the excess flow based on the difference between the supply demand flow and the actual supply flow, and controls the opening of the bypass valve of the bypass pipeline according to the excess flow. Specifically, the greater the excess flow, the greater the opening of the bypass valve.

[0086] Those skilled in the art should note that, for the safe operation of the system, when the water flow through the chiller is too small, the chiller will be unable to refrigerate or even damaged. Therefore, when the average total chilled water flow in the air-conditioning chilled water system is too small, the bypass valve of the bypass pipeline needs to be opened so that a part of the water is internally circulated between the bypass pipeline and the chiller pipeline without flowing through the user to divide the excess flow and ensure the amount of chilled water required for the safe operation of the system. At the same time, specifically, the opening range of the bypass valve in the bypass pipeline is 0~20%. This is because, when the bypass valve is opened too much, a large amount of chilled water will be mixed with the hot water return water flowing through the user, and the return water temperature will be reduced accordingly. When the return water temperature drops to too low (for example, less than or equal to 17°C), the chiller will stop refrigerating or even be damaged.

[0087] In a specific embodiment, when a water pump in operation fails, the control center can also monitor the working status of the chilled water pump in real time to determine whether it has failed. When it is determined that it has failed, other chilled water pumps in parallel will be controlled to be in working state to meet the flow requirements of the system.

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

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

[0090] See also Fig. 9 The control device of 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 sum acquisition module 930, a surplus flow adjustment module 940, a supply demand flow acquisition module 950 and a control module 960.

[0091] Among them, the real-time chilled water flow acquisition module 910 is used to obtain the real-time chilled water flow of each user in the air-conditioning chilled water system; the average chilled water flow acquisition module 920 is used to obtain the average chilled water flow in the unit mapping time period based on the real-time chilled water flow data string of each user in the unit mapping time period; the average chilled water flow sum acquisition module 930 is used to obtain the average chilled water flow sum of all users in the unit mapping time period based on the average chilled water flow of each user in the unit mapping time period; the surplus flow adjustment module is used to control the surplus flow to follow the change within a set range based on the change trend of the sum of the real-time chilled water flow of each user in the unit time period; the supply demand flow acquisition module 950 is used to use the sum of the average chilled water flow sum in the unit mapping time period and the surplus flow as the supply demand flow in the next unit mapping time period; the control module 960 includes at least a chilled water pump operating frequency control module, which is used to adjust the operating frequency of the chilled water pump based on the corresponding supply 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 operating number of chilled water pumps in the next mapping time period according to the supply demand flow to ensure that the supply demand flow is met.

[0093] In some optional embodiments, the control module 960 further includes a bypass line control module 963, which is used to control the bypass line connection to ensure the flow required for safe operation of the system when only one chilled water pump is in the lowest frequency working state and the average total chilled water flow rate within the 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 communicated with the real-time chilled water flow acquisition module 910 to obtain the real-time chilled water flow of each user, and the average of the real-time chilled water flow of each user within the unit mapping time is calculated to obtain the average chilled water flow of each user within the unit mapping time.

[0096] In some optional embodiments, the average chilled water flow sum acquisition module 930 is communicated with the average chilled water flow acquisition module 920, and the average chilled water flow of each user in the unit mapping time is added up to obtain the average chilled water flow sum of all users in the unit mapping time period.

[0097] In some optional embodiments, the residual flow rate adjustment module 940 is a certain value per unit time, and the value of the residual flow rate can be set to a certain range, for example, considering ensuring that the demand is met without excessive waste or causing excessive water pipe pressure, it can be 10~100m 3 / h. Fig. 9 As shown, the surplus flow regulating module 940 is in communication connection with the average chilled water flow sum acquiring module 930, and controls the surplus flow value in the next unit time period according to the variation range of the sum of the real-time chilled water flow of each user in a similar historical time period.

[0098] In some optional embodiments, the supply demand flow acquisition module 950 is communicated with the average chilled water flow sum acquisition module 930 and the surplus flow adjustment module 940, and the supply demand flow in the next unit mapping time period is obtained by adding the average chilled water flow sum and the surplus flow of all users in the unit mapping time period.

[0099] In a specific embodiment, the control module 960 is a 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 corresponding to the determined frequency of the chilled water pump, and gives the information to the chilled water pump operating frequency control module 961, the chilled water pump working unit number control module 962 and the bypass pipeline control module 963, thereby controlling and adjusting the frequency of the chilled water pump, the working number of the chilled water pump and the valve opening of the bypass pipeline to ensure the flow demand of each user end and ensure the safe and stable operation of the system.

[0101] This embodiment further provides a computer-readable storage medium on which a computer program is stored. When the program is called by a processor, the control method of the air-conditioning chilled water system provided by the present invention is implemented.

[0102] Among them, the computer-readable storage medium can be a tangible device that can hold and store instructions used by the instruction execution device. The computer-readable storage medium can be, for example, (but not limited to) an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the above. More specific examples of computer-readable storage media (a non-exhaustive list) include: a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a static random access memory (SRAM), a portable compact disk read-only memory (CD-ROM), a digital versatile disk (DVD), a memory stick, a floppy disk, and a mechanical encoding device.

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

[0104] See also Fig.10 This embodiment provides a schematic diagram of the structure of an electronic device for implementing the energy-saving control method of the air-conditioning chilled water system. The electronic device described in the present invention represents a computer for data processing and communication.

[0105] like Fig.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 in the memory 120 and executable on the processor 130, and the 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 in any combination of one or more programming languages, and the computer program may be executed completely on the machine, partially on the machine, partially on the machine as an independent software package and partially on a remote machine, or completely on a remote machine or server.

[0106] It should be noted that it should be understood that the division of the various modules of the above devices is only a division of logical functions. In actual implementation, they can be fully or partially integrated into one physical entity, or physically separated. Moreover, these modules can be all implemented in the form of software calling through processing elements, or all implemented in the form of hardware, or some modules can be implemented in the form of software calling through processing elements, and some modules can be implemented in the form of hardware.

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

[0108] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may 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 a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall 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: Obtaining the real-time chilled water flow of each user in the air-conditioning chilled water system; wherein the air-conditioning chilled water system includes a chilled water pump; Based on the real-time chilled water flow data string of each user in the unit mapping time period, the average chilled water flow in the unit mapping time period is obtained; Based on the average chilled water flow of each user in the unit mapping time period, the sum of the average chilled water flow of all users in the unit mapping time period is obtained; The sum of the average chilled water flow rate in the unit mapping time period and the set surplus flow rate is used as the supply demand flow rate in the next unit mapping time period; In the next unit mapping time period, the operating frequency of the chilled water pump is adjusted based on the corresponding supply demand flow rate.

2. The energy-saving control method according to claim 1, characterized in that: The user is a floor, a communication room unit or a communication equipment unit; and / or the unit mapping time period is 10 to 180 seconds; and / or the remaining flow is 10 to 100 m 3 / h; and / or, the air-conditioning chilled water system includes one or more users, and any one user is connected in parallel with any other user based on a chilled water pipeline; and / or, the air-conditioning chilled water system is provided with a regulating valve at the user, and the air-conditioning controls the valve opening of the regulating valve in real time according to the supply and return air temperatures to ensure that the air-conditioning acts on the user at a constant set temperature.

3. The energy-saving control method according to claim 2, characterized in that: The surplus flow is fixed in a unit time period, and the surplus flow value in the next unit time period is set based on the change range of the sum of the real-time chilled water flow of each user in a similar historical time period.

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

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

6. 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 arranged in parallel with any chilled water pipeline serving the user; when only one chilled water pump is in the lowest frequency working state and the sum of the average chilled water flow rates within the 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 operation of the system.

7. A control device for an air conditioning chilled water system in a data center, characterized in that: include: A real-time chilled water flow acquisition module is used to obtain the real-time chilled water flow of each user in the air-conditioning chilled water system; An average chilled water flow acquisition module is used to acquire the average chilled water flow within the 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, used to acquire the average chilled water flow sum of all users in the unit mapping time period based on the average chilled water flow of each user in the unit mapping time period; A supply demand flow acquisition module is used to take the sum of the average chilled water flow in the unit mapping time period and the set surplus flow as the supply demand flow in 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 demand flow rate within the next unit mapping time period.

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

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and the computer program is used to enable a processor to implement the energy-saving control method according to any one of claims 1 to 6 when executed.

10. An electronic device, characterized in that: The electronic device comprises: 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 6.

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