Central air conditioning chilled water pump energy-saving optimization control system and method

Abstract

This invention relates to an energy-saving optimization control system and method for a central air conditioning chilled water pump. The system includes a circulating water loop formed by a chiller, a chilled water pump, terminal air conditioning units, and a water outlet valve connected in sequence, and a controller. The chiller and chilled water pump are connected, as are the chilled water pump and the terminal air conditioning units, via chilled water supply pipes. The terminal air conditioning units and the water outlet valve are connected, as are the water outlet valve and the chiller, via chilled water return pipes. A first sensing component is installed on the chilled water supply pipe, and a second sensing component is installed on the chilled water return pipe. A frequency converter, the first sensing component, and the second sensing component are electrically connected to the controller. The system calculates the difference between the supply and return water parameters and the setpoints for these parameters based on the supply and return water parameter information. This allows the frequency converter to be calculated, dynamically maintaining the difference between the supply and return water parameters within a preset deviation range of the setpoints.

Description

Technical Field

[0001] This invention relates to the field of energy-saving control technology for central air conditioning, and in particular to an energy-saving optimization control system and method for central air conditioning chilled water pumps. Background Technology

[0002] With technological advancements and rising living standards, central air conditioning systems are becoming increasingly widespread. Air conditioning systems account for 40%-60% of building energy consumption, with air conditioning water systems contributing approximately 30% of that. Therefore, reducing the energy consumption of air conditioning water systems is a primary direction for saving building energy. Building air conditioning loads fluctuate constantly with changes in outdoor meteorological parameters and indoor heat generation. Most of the time, the building's air conditioning load is under partial load, and the required water flow rate for the air conditioning water system is often lower than the design flow rate. Therefore, variable flow control of the chilled water system based on the water demand of the air conditioning terminals can effectively reduce the energy consumption of the chilled water pumps. In practical engineering applications, a common method for variable flow control of chilled water systems is frequency conversion control of the chilled water pumps based on the pressure difference or temperature difference between the chilled water supply and return mains. Generally, the refrigerant evaporator has a minimum flow limit. When the evaporator flow rate is less than this minimum limit, the chiller will issue a fault signal and automatically shut down for protection. To avoid this phenomenon, when using differential pressure control, a large differential pressure setpoint is often used in actual engineering projects. This reduces the adjustable range of the system water flow, leads to a higher operating frequency of the chilled water pump, higher energy consumption, and poor energy-saving effect. This is especially true for systems where the chilled water valves of some terminal air conditioning units are not well regulated, where the differential pressure cannot reflect changes in terminal load, resulting in even worse energy-saving performance. While temperature difference control can accurately reflect changes in terminal load, the response speed of water pipe temperature is very slow, exhibiting significant lag in practical engineering applications and failing to adequately meet the cooling needs of the terminals. Therefore, an optimized control system and method are needed that combines the advantages of rapid response from differential pressure and accurate feedback from temperature difference, minimizing the energy consumption of the air conditioning chilled water system while meeting the cooling needs of the terminals, thus promoting the application of building energy conservation and emission reduction technologies.

[0003] Traditional air conditioning chilled water pump variable flow control methods either use differential pressure control, which can meet the cooling effect but has poor energy saving effect, or use temperature difference control, which has a better energy saving effect but slow response and cannot meet the cooling needs of the terminal in a timely manner. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to address the shortcomings of the prior art by providing an energy-saving optimization control system and method for central air conditioning chilled water pumps, which can maximize the saving of chilled water pump operating energy consumption while ensuring the cooling demand of the system terminals.

[0005] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: A central air conditioning chilled water pump energy-saving optimization control system includes a circulating water loop formed by sequentially connecting a refrigeration unit, a chilled water pump equipped with a frequency converter, a terminal air conditioning unit, and a water outlet valve with an electric actuator for adjusting the opening degree, and a controller. The refrigeration unit and the chilled water pump, as well as the chilled water pump and the terminal air conditioning unit, are respectively connected through chilled water supply pipes. The terminal air conditioning unit and the water outlet valve, as well as the water outlet valve and the refrigeration unit, are respectively connected through chilled water return pipes. A first sensing and detection component is respectively installed on the chilled water supply pipe, and a second sensing and detection component is installed on the chilled water return pipe. The frequency converter, the first sensing and detection component, and the second sensing and detection component are respectively electrically connected to the controller.

[0006] The first sensing and detection component includes a first pressure sensor and a first temperature sensor. The first pressure sensor is used to detect the real-time supply pressure of the chilled water in the chilled water supply pipe, and the first temperature sensor is used to detect the real-time supply temperature of the chilled water in the chilled water supply pipe and output it to the controller.

[0007] The second sensing and detection component includes a second pressure sensor and a second temperature sensor. The second pressure sensor is used to detect the real-time return water pressure value of the chilled water in the chilled water return pipe in real time, and the second temperature sensor is used to detect the real-time return water temperature value of the chilled water in the return pipe in real time and output it to the controller.

[0008] The controller is used to calculate the optimized supply and return water pressure difference setpoint for chilled water based on the real-time supply water temperature, real-time return water temperature, and upper and lower limits of the real-time supply and return water temperature difference; to calculate the real-time supply and return water pressure difference based on the real-time supply water pressure and real-time return water pressure; and to determine the operating frequency of the frequency converter based on the real-time supply and return water pressure difference setpoint and the supply and return water pressure difference setpoint. The upper limit of the real-time supply and return water temperature difference is 4.5–6.5℃, and the lower limit is 3–4.5℃.

[0009] The frequency converter is used to control the speed of the chilled water pump according to the operating frequency, and to dynamically keep the supply and return water pressure difference between the chilled water supply pipe and the chilled water return pipe within the deviation range of the supply and return water pressure difference set value.

[0010] The beneficial effects of this invention are as follows: The central air conditioning chilled water pump energy-saving optimization control system of this invention collects the real-time supply water temperature, real-time return water temperature, real-time supply water pressure, and real-time return water pressure of the chilled water in the chilled water supply pipe through the first pressure sensor, the first temperature sensor, the second pressure sensor, and the second temperature sensor, respectively. The controller calculates the supply and return water pressure difference and the set value of the supply and return water pressure difference, and then calculates the operating frequency of the frequency converter, thereby controlling the speed of the chilled water pump to dynamically and constantly maintain the supply and return water pressure difference between the chilled water supply pipe and the chilled water return pipe at a set value. Within the preset deviation range of the supply and return water pressure difference setting value, the accuracy and reliability of the supply and return water pressure difference calculation are improved. The supply and return water pressure difference value of chilled water can be automatically adjusted according to the real-time supply water temperature, return water temperature, supply water pressure and return water pressure values, which improves the automation level of the entire system, reduces the system's response time to environmental changes, and reduces system energy consumption while ensuring system safety and stability. This achieves energy-saving operation of the central air conditioning chilled water system. The algorithm is simple, the operation is stable and reliable, and it is suitable for installation and commissioning in actual projects. It can be widely used in building air conditioning systems.

[0011] Based on the above technical solution, the present invention can be further improved as follows:

[0012] Furthermore: the controller includes a supply and return water parameter difference optimization module and a frequency conversion control module;

[0013] The supply and return water parameter difference optimization module is used to calculate the optimized supply and return water pressure difference setpoint based on the real-time supply water temperature T1, the real-time return water temperature T2, and the upper and lower limits of the real-time supply and return water temperature difference. And output to the frequency converter control module;

[0014] The variable frequency control module is used to calculate the real-time supply and return water pressure difference of the chilled water based on the real-time supply water pressure P1 and the real-time return water pressure P2, and to determine whether it is within the set value of the supply and return water pressure difference. If the deviation is within the specified range, the inverter's operating frequency is maintained at the previous output value; otherwise, the real-time supply and return water pressure difference of the chilled water is compared with the set value of the supply and return water pressure difference. The frequency of the inverter is recalculated using a PID algorithm after comparison and then output to the inverter.

[0015] The beneficial effect of the above-mentioned further solution is that it determines whether the real-time supply and return water pressure difference is within the set value. Within the deviation range, it can be used when the real-time supply and return water pressure difference exceeds the set value. When the deviation range is reached, the operating frequency of the frequency converter is promptly re-determined, and the speed of the chilled water pump is adjusted accordingly. This ensures that the real-time supply and return water pressure difference between the chilled water supply and return pipes is dynamically maintained within the set value. Within the deviation range.

[0016] Furthermore, the supply and return water parameter difference optimization module uses a periodic calculation method when calculating the set value of the chilled water supply and return water pressure difference.

[0017] The beneficial effect of the above-mentioned further solution is that by using a periodic calculation method to calculate the set value of the differential pressure between chilled water supply and return water, the frequent entry of the supply and return water parameter difference optimization module into the calculation can be avoided, which would cause the differential pressure set value to change frequently and thus cause system operation oscillation.

[0018] Furthermore, the supply and return water parameter difference optimization module calculates the optimized supply and return water pressure difference setpoint based on the real-time supply water temperature T1, the real-time return water temperature T2, and the upper and lower limits of the real-time supply and return water temperature difference. The specific implementation is as follows:

[0019] If ΔT>ΔT up ,but

[0020] If ΔT < ΔT down ,but

[0021] If ΔT down ≤ΔT≤ΔT up ,but

[0022] if but

[0023] if but

[0024] Where ΔT is the real-time supply and return temperature difference of chilled water, ΔT up ΔT represents the upper limit of the real-time supply and return water temperature difference for chilled water. down ΔP is the lower limit of the real-time supply and return water temperature difference for chilled water. set The preset differential pressure between chilled water supply and return is ΔP, where 'a' is the differential pressure optimization coefficient. set，up The upper limit of the adjustable differential pressure, ΔP setdown This is a settable lower limit value for differential pressure.

[0025] The beneficial effect of the above-mentioned further scheme is that when the real-time supply and return water temperature difference ΔT of the chilled water is higher than the set upper limit value ΔT of the supply and return water temperature difference, the chilled water will be able to withstand the temperature difference. upAt that time, the optimized real-time supply and return water pressure difference setpoint To set the preset chilled water supply and return pressure difference value ΔP set The positive correction value is when the real-time supply and return water temperature difference ΔT of the chilled water is equal to the set upper limit value ΔT of the supply and return water temperature difference. up The larger the difference, the lower the preset chilled water supply and return pressure difference setting ΔP. set The larger the positive correction range, the better the optimized chilled water supply and return water pressure difference setpoint. The larger the temperature difference, the higher the operating frequency of chilled water pump 2 will be, thereby reducing the supply and return water temperature difference to meet the cooling capacity supply at the terminal. When the real-time supply and return water temperature difference ΔT is lower than the set lower limit ΔT for the real-time supply and return water temperature difference... down At that time, the optimized real-time supply and return water pressure difference setpoint To set the preset chilled water supply and return pressure difference value ΔP set The negative correction value is when the real-time supply and return water temperature difference ΔT of the chilled water is different from the set lower limit value ΔT of the real-time supply and return water temperature difference. down The larger the difference, the lower the preset chilled water supply and return pressure difference setting ΔP. set The larger the negative correction magnitude, the greater the optimized chilled water supply and return water pressure difference setpoint. The smaller the value, the lower the operating frequency of chilled water pump 2 will be, thereby increasing the supply and return water temperature difference and further reducing the energy consumption of the chilled water pump; when the real-time supply and return water temperature difference ΔT is within the set lower limit value ΔT of the real-time supply and return water temperature difference. down and the upper limit of the real-time supply and return water temperature difference ΔT of the chilled water. up During this period, the optimized supply and return water pressure differential setpoints for chilled water are... Equal to the preset chilled water supply and return water pressure difference setting value ΔP set That is, the preset chilled water supply and return water pressure difference setting value ΔP is not used. set Make corrections.

[0026] Further: The optimized supply and return water pressure difference setting value for the chilled water The range is from the lower limit of the differential pressure to the upper limit of the differential pressure, and when the supply and return water differential pressure setpoint of the chilled water is... Greater than the upper limit of the pressure difference ΔP set，up When this happens, the set value of the supply and return water pressure difference of the chilled water is determined. Equal to the upper limit of pressure difference ΔP set，up When the supply and return water pressure difference setpoint Less than the lower limit of pressure difference ΔP set，down When this happens, the set value of the supply and return water pressure difference of the chilled water is determined. Equal to the lower limit of the pressure difference ΔP set，down .

[0027] The beneficial effect of the above-mentioned further solution is that it controls the set value of the supply and return water pressure difference of the chilled water. The pressure differential range, from the lower limit to the upper limit, allows for a certain safety margin, ensuring the safety and stability of the entire system.

[0028] This invention also provides an energy-saving optimization control method for a central air conditioning chilled water pump, which employs the aforementioned energy-saving optimization control system for a central air conditioning chilled water pump, characterized by the following steps:

[0029] S1: Detect the real-time supply temperature of chilled water in the chilled water supply pipe and the real-time return temperature of chilled water in the chilled water return pipe, and calculate the optimized supply and return pressure difference setpoint for chilled water.

[0030] S2: Detect the real-time supply pressure of chilled water in the chilled water supply pipe and the real-time return pressure of chilled water in the chilled water return pipe respectively, calculate the supply and return pressure difference of chilled water, and determine whether it is within the set value of the supply and return pressure difference of chilled water. If the deviation is within the specified range, then the operating frequency of the inverter is controlled to remain unchanged from the previous output value; otherwise, proceed to S3.

[0031] S3: Compare the real-time supply and return water pressure difference with the set value of the supply and return water pressure difference. The frequency of the inverter is recalculated using a PID algorithm after comparison, and then output to the inverter.

[0032] S4: The frequency converter controls the speed of the chilled water pump according to the operating frequency, and dynamically keeps the difference between the supply and return water parameters between the chilled water supply pipe and the chilled water return pipe within the preset deviation range of the supply and return water parameter settings.

[0033] The present invention discloses an energy-saving optimization control method for central air conditioning chilled water pumps. This method collects chilled water supply parameters from the chilled water supply pipe and return parameters from the chilled water return pipe, calculates the supply-return parameter difference and the setpoint values, and then calculates the operating frequency of the inverter to control the speed of the chilled water pump. This dynamically keeps the supply-return parameter difference between the chilled water supply and return pipes within a preset deviation range of the setpoint values, improving the accuracy and reliability of the parameter difference calculation. The supply-return parameter difference can be automatically adjusted based on real-time chilled water supply and return parameter information, increasing the automation level of the entire system and reducing the system's response time to environmental changes. While ensuring system safety and stability, it also reduces system energy consumption, achieving energy-saving operation of the central air conditioning chilled water system. The algorithm is simple, the operation is stable and reliable, and it is suitable for installation and commissioning in practical engineering projects, making it widely applicable to building air conditioning systems.

[0034] Based on the above technical solution, the present invention can be further improved as follows:

[0035] Further: the calculated and optimized supply and return water pressure difference setpoint. Specifically, the steps include the following:

[0036] If ΔT>ΔT up ,but

[0037] If ΔT < ΔT down ,but

[0038] If ΔT down ≤ΔT≤ΔT up ,but

[0039] if but

[0040] if but

[0041] Where ΔT is the real-time supply and return temperature difference of chilled water, ΔT up ΔT represents the upper limit of the real-time supply and return water temperature difference for chilled water. down ΔP is the lower limit of the real-time supply and return water temperature difference for chilled water. set The preset differential pressure between chilled water supply and return is ΔP, where 'a' is the differential pressure optimization coefficient. set，up The upper limit of the adjustable differential pressure, ΔP set，down This is a settable lower limit value for differential pressure.

[0042] The beneficial effect of the above-mentioned further scheme is that when the real-time supply and return water temperature difference ΔT of the chilled water is higher than the set upper limit value ΔT of the supply and return water temperature difference, the chilled water will be able to withstand the temperature difference. up At that time, the optimized real-time supply and return water pressure difference setpoint To set the preset chilled water supply and return pressure difference value ΔP set The positive correction value is when the real-time supply and return water temperature difference ΔT of the chilled water is equal to the set upper limit value ΔT of the supply and return water temperature difference. up The larger the difference, the lower the preset chilled water supply and return pressure difference setting ΔP. set The larger the positive correction range, the better the optimized chilled water supply and return water pressure difference setpoint. The larger the temperature difference, the higher the operating frequency of chilled water pump 2 will be, thereby reducing the supply and return water temperature difference to meet the cooling capacity supply at the terminal. When the real-time supply and return water temperature difference ΔT is lower than the set lower limit ΔT for the real-time supply and return water temperature difference... down At that time, the optimized real-time supply and return water pressure difference setpoint To set the preset chilled water supply and return pressure difference value ΔP set The negative correction value is when the real-time supply and return water temperature difference ΔT of the chilled water is different from the set lower limit value ΔT of the real-time supply and return water temperature difference. down The larger the difference, the lower the preset chilled water supply and return pressure difference setting ΔP. set The larger the negative correction magnitude, the greater the optimized chilled water supply and return water pressure difference setpoint. The smaller the value, the lower the operating frequency of chilled water pump 2 will be, thereby increasing the supply and return water temperature difference and further reducing the energy consumption of the chilled water pump; when the real-time supply and return water temperature difference ΔT is within the set lower limit value ΔT of the real-time supply and return water temperature difference. down and the upper limit of the real-time supply and return water temperature difference ΔT of the chilled water. up During this period, the optimized supply and return water pressure differential setpoints for chilled water are... Equal to the preset chilled water supply and return water pressure difference setting value ΔP set That is, the preset chilled water supply and return water pressure difference setting value ΔP is not used. set Make corrections.

[0043] The present invention also provides a computer-readable storage medium storing computer instructions for causing a processor to execute the aforementioned energy-saving optimization control method for a central air conditioning chilled water pump.

[0044] The present invention also provides an energy-saving optimization control device for a central air conditioning chilled water pump, the central air conditioning chilled water pump energy-saving optimization control device comprising:

[0045] At least one processor and a storage medium, wherein the memory is communicatively connected to the processor;

[0046] The storage medium stores a computer program that can be executed by the at least one processor, and the computer program is executed by the at least one processor to enable the at least one processor to execute the central air conditioning chilled water pump energy-saving optimization control method. Attached Figure Description

[0047] Figure 1 This is a schematic diagram of the structure of a central air conditioning chilled water pump energy-saving optimization control system according to an embodiment of the present invention;

[0048] Figure 2 This is a flowchart illustrating an embodiment of the energy-saving optimization control method for a central air conditioning chilled water pump according to the present invention.

[0049] The attached diagram lists the components represented by each number as follows:

[0050] 1. Refrigeration unit, 2. Chilled water pump, 3. Terminal air conditioning unit, 4. Electric bypass valve, 5. Inverter, 6. Electric actuator, 7. Chilled water supply pipe, 8. Chilled water return pipe, 9. First pressure sensor, 10. Second pressure sensor, 11. First temperature sensor, 12. Second temperature sensor, 13. Controller, 14. Supply and return water parameter difference optimization module, 15. Variable frequency control module. Detailed Implementation

[0051] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0052] like Figure 1 As shown, a central air conditioning chilled water pump energy-saving optimization control system includes a circulating water loop formed by sequentially connecting a refrigeration unit 1, a chilled water pump 2 equipped with a frequency converter 5, a terminal air conditioning unit 3, and a water outlet valve 4 with an electric actuator 6 for adjusting the opening degree, and a controller 13. The refrigeration unit 1 and the chilled water pump 2, as well as the chilled water pump 2 and the terminal air conditioning unit 3, are respectively connected by chilled water supply pipes 7. The terminal air conditioning unit 3 and the water outlet valve 4, as well as the water outlet valve 4 and the refrigeration unit 1, are respectively connected by chilled water return pipes 8. A first sensing component is respectively installed on the chilled water supply pipe 7, and a second sensing component is installed on the chilled water return pipe 8. The frequency converter 5, the first sensing component, and the second sensing component are respectively electrically connected to the controller 13.

[0053] The first sensing and detection component includes a first pressure sensor 9 and a first temperature sensor 11. The first pressure sensor 9 is used to detect the real-time supply pressure of the chilled water in the chilled water supply pipe 7, and the first temperature sensor 11 is used to detect the real-time supply temperature of the chilled water in the chilled water supply pipe 7 and output it to the controller 13.

[0054] The second sensing and detection component includes a second pressure sensor 10 and a second temperature sensor 12. The second pressure sensor 10 is used to detect the real-time return water pressure value of the chilled water in the chilled water return pipe 8 in real time, and the second temperature sensor 12 is used to detect the real-time return water temperature value of the chilled water in the return water pipe 8 in real time and output it to the controller 13.

[0055] The controller 13 is used to calculate the optimized supply and return water pressure difference setting value of chilled water based on the real-time supply water temperature value, the real-time return water temperature value, and the upper and lower limits of the real-time supply and return water temperature difference; to calculate the real-time supply and return water pressure difference value based on the real-time supply water pressure value and the real-time return water pressure difference setting value; and to determine the operating frequency of the frequency converter 5 based on the real-time supply and return water pressure difference value and the supply and return water pressure difference setting value; wherein, the upper limit of the real-time supply and return water temperature difference is 4.5 to 6.5℃, and the lower limit of the real-time supply and return water temperature difference is 3 to 4.5℃;

[0056] The frequency converter 5 is used to control the speed of the chilled water pump 2 according to the operating frequency, and to dynamically keep the supply and return water pressure difference between the chilled water supply pipe 7 and the chilled water return pipe 8 within the deviation range of the supply and return water pressure difference set value.

[0057] The central air conditioning chilled water pump energy-saving optimization control system of the present invention collects the real-time supply water temperature, real-time return water temperature, real-time supply water pressure, and real-time return water pressure of the chilled water in the chilled water supply pipe 7 through the first pressure sensor 9, the first temperature sensor 11, the second pressure sensor 10, and the second temperature sensor 12, respectively. The controller 13 calculates the supply and return water pressure difference and the supply and return water pressure difference setpoint, and then calculates the operating frequency of the frequency converter 5, thereby controlling the speed of the chilled water pump 2 to dynamically keep the supply and return water pressure difference between the chilled water supply pipe 7 and the chilled water return pipe 8 constant. Within the preset deviation range of the supply and return water pressure difference setting value, the accuracy and reliability of the supply and return water pressure difference calculation are improved. The supply and return water pressure difference value of chilled water can be automatically adjusted according to the real-time supply water temperature, return water temperature, supply water pressure and return water pressure values ​​of chilled water, which improves the automation level of the entire system, reduces the system's response time to environmental changes, and reduces system energy consumption while ensuring system safety and stability. This achieves energy-saving operation of the central air conditioning chilled water system. The algorithm is simple, the operation is stable and reliable, and it is suitable for installation and commissioning in actual projects. It can be widely used in building air conditioning systems.

[0058] According to the above implementation method, the first pressure sensor 9 and the first temperature sensor 11 can respectively collect the real-time supply pressure and supply temperature of chilled water in the chilled water supply pipe 7, and the second pressure sensor 10 and the second temperature sensor 12 can respectively collect the real-time return pressure and return temperature of chilled water in the chilled water return pipe 8. This makes it easier for the controller 13 to calculate the real-time supply and return pressure difference of chilled water and the set value of the supply and return pressure difference of chilled water.

[0059] According to the above implementation method, the controller 13 is used to collect real-time operating data of the system. The operating data includes the temperature values ​​of the supply and return water pipes collected by the temperature sensor and the pressure values ​​of the supply and return water collected by the pressure sensor. The controller 13 calculates the operating frequency value of the chilled water pump 2 and transmits the calculated operating frequency value to the frequency converter 5 through an electrical signal. The frequency converter 5 adjusts the operating frequency of the chilled water pump 2, thereby maintaining the supply and return water pressure difference of the chilled water within the deviation range of the optimized pressure difference setting value.

[0060] According to the above implementation method, after receiving the calculated operating frequency of the chilled water pump 2, the inverter 5 adjusts the speed of the chilled water pump 2, thereby adjusting the supply and return water pressure difference between the chilled water supply pipe 7 and the chilled water return pipe 8, so that it is maintained within the deviation range of the optimized pressure difference setting value. This not only accurately responds to changes in terminal load, but also quickly tracks the terminal cooling demand. Under the premise of meeting the terminal cooling demand, it minimizes the energy consumption of the air conditioning chilled water system and achieves the goal of energy saving.

[0061] In one or more embodiments of the present invention, the controller 13 includes a supply and return water parameter difference optimization module 14 and a frequency conversion control module 15;

[0062] The supply and return water parameter difference optimization module 14 is used to calculate the optimized supply and return water pressure difference setpoint based on the real-time supply water temperature T1, the real-time return water temperature T2, and the upper and lower limits of the real-time supply and return water temperature difference. And output to the frequency converter control module 15;

[0063] The variable frequency control module 15 is used to calculate the real-time supply and return water pressure difference of the chilled water based on the real-time supply water pressure P1 and the real-time return water pressure P2, and to determine whether it is within the set value of the supply and return water pressure difference of the chilled water. If the deviation is within the specified range, the operating frequency of the inverter 5 is maintained at the previous output value; otherwise, the real-time supply and return water pressure difference of the chilled water is compared with the set value of the supply and return water pressure difference of the chilled water. The operating frequency of the inverter 5 is recalculated using a PID algorithm after comparison, and then output to the inverter 5.

[0064] By determining whether the real-time supply and return water pressure difference is within the set value. Within the deviation range, it can be used when the real-time supply and return water pressure difference exceeds the set value. When the deviation range is reached, the operating frequency of the frequency converter 5 is promptly re-determined, and the speed of the chilled water pump 2 is adjusted accordingly. This ensures that the real-time supply and return water pressure difference between the chilled water supply pipe 7 and the chilled water return pipe 8 is dynamically maintained within the set value. Within the deviation range.

[0065] It should be noted that the PID algorithm used to calculate the operating frequency of the inverter 5 is a commonly used algorithm. The specific algorithm formula is not the subject of this invention, so it will not be described in detail in this specification.

[0066] Optionally, in one or more embodiments of the present invention, the supply and return water parameter difference optimization module 14 uses a periodic calculation method when calculating the set value of the chilled water supply and return water pressure difference.

[0067] By using a periodic calculation method to calculate the set value of the differential pressure between chilled water supply and return water, the frequent entry of the supply and return water parameter difference optimization module 14 into the calculation can be avoided, which would cause frequent changes in the differential pressure set value and thus cause system oscillation.

[0068] In one or more embodiments of the present invention, the supply and return water parameter difference optimization module 14 calculates the optimized supply and return water pressure difference setpoint based on the real-time supply water temperature T1, the real-time return water temperature T2, and the upper and lower limits of the real-time supply and return water temperature difference. The specific implementation is as follows:

[0069] If ΔT>ΔT up ,but

[0070] If ΔT < ΔT down ,but

[0071] If ΔT down ≤ΔT≤ΔT up ,but

[0072] if but

[0073] if but

[0074] Where ΔT is the real-time supply and return temperature difference of chilled water, ΔT up ΔT represents the upper limit of the real-time supply and return water temperature difference for chilled water. down ΔP is the lower limit of the real-time supply and return water temperature difference for chilled water. set The preset differential pressure between chilled water supply and return is ΔP, where 'a' is the differential pressure optimization coefficient. set，up The upper limit of the adjustable differential pressure, ΔP set , down This is a settable lower limit value for differential pressure.

[0075] When the real-time supply and return temperature difference of chilled water ΔT is higher than the set upper limit value ΔT for the supply and return temperature difference of chilled water... up At that time, the optimized real-time supply and return water pressure difference setpoint To set the preset chilled water supply and return pressure difference value ΔP set The positive correction value is when the real-time supply and return water temperature difference ΔT of the chilled water is equal to the set upper limit value ΔT of the supply and return water temperature difference. up The larger the difference, the lower the preset chilled water supply and return pressure difference setting ΔP. set The larger the positive correction range, the better the optimized chilled water supply and return water pressure difference setpoint. The larger the temperature difference, the higher the operating frequency of chilled water pump 2 will be, thereby reducing the supply and return water temperature difference to meet the cooling capacity supply at the terminal. When the real-time supply and return water temperature difference ΔT is lower than the set lower limit ΔT for the real-time supply and return water temperature difference... down At that time, the optimized real-time supply and return water pressure difference setpoint To set the preset chilled water supply and return pressure difference value ΔP set The negative correction value is when the real-time supply and return water temperature difference ΔT of the chilled water is different from the set lower limit value ΔT of the real-time supply and return water temperature difference. down The larger the difference, the lower the preset chilled water supply and return pressure difference setting ΔP. set The larger the negative correction magnitude, the greater the optimized chilled water supply and return water pressure difference setpoint. The smaller the value, the lower the operating frequency of chilled water pump 2 will be, thereby increasing the supply and return water temperature difference and further reducing the energy consumption of the chilled water pump; when the real-time supply and return water temperature difference ΔT is within the set lower limit value ΔT of the real-time supply and return water temperature difference. down and the upper limit of the real-time supply and return water temperature difference ΔT of the chilled water. up During this period, the optimized supply and return water pressure differential setpoints for chilled water are... Equal to the preset chilled water supply and return water pressure difference setting value ΔP set That is, the preset chilled water supply and return water pressure difference setting value ΔP is not used. set Make corrections.

[0076] Specifically, here, the preset chilled water supply and return pressure difference setting value ΔP set The pressure difference needs to be determined based on the actual system operating pressure. The upper limit of the pressure difference is the pressure difference value that allows the chilled water pump 2 to operate at its maximum frequency, and the lower limit of the pressure difference is the pressure difference value that allows the chilled water pump 2 to operate at its minimum frequency.

[0077] In addition, in one or more embodiments of the present invention, the differential pressure optimization coefficient 'a' ranges from 5 to 50. The larger the value, the larger the differential pressure optimization amplitude and the more aggressive the pump frequency adjustment. The smaller the value, the smaller the differential pressure optimization amplitude and the slower the pump frequency adjustment. In practical applications, a value of 10 can be used.

[0078] Optionally, in one or more embodiments of the present invention, the optimized supply and return water pressure difference setpoint for the chilled water is... The range is from the lower limit of the differential pressure to the upper limit of the differential pressure, and when the supply and return water differential pressure setpoint of the chilled water is... Greater than the upper limit of the pressure difference ΔP set，up When this happens, the set value of the supply and return water pressure difference of the chilled water is determined. Equal to the upper limit of pressure difference ΔP set，up When the supply and return water pressure difference setpoint Less than the lower limit of pressure difference ΔP st，down When this happens, the set value of the supply and return water pressure difference of the chilled water is determined. Equal to the lower limit of the pressure difference ΔP set，down .

[0079] By controlling the supply and return water pressure difference setpoint of the chilled water The range of differential pressure, from the lower limit to the upper limit, allows for a certain safety margin, ensuring the safety and stability of the entire system. Here, the upper limit of the temperature difference is preferably 4.5℃ to 6.5℃; the lower limit is 3℃ to 4.5℃. It should be noted that in existing technologies, the upper limit of the temperature difference in air conditioning systems is designed based on 5℃, and the selection of heat dissipation equipment for terminal systems is also based on 5℃. The actual selected equipment has a certain margin, and as the service life increases, the heat exchange capacity of the terminal system decreases due to scaling and other reasons. In the embodiments of this invention, when designing the load, for systems with a short service life, the maximum temperature difference of the terminal design margin can be set to above 6℃, and the overall optimization parameters can be set to maximize the energy saving of the water pump. For systems with a long service life, the maximum temperature difference can be set 5℃ lower than the design value to ensure sufficient cooling supply to the terminal system. Therefore, in this invention, setting the upper limit of the temperature difference to 4.5℃ to 6.5℃ can meet the control requirements of different systems.

[0080] In embodiments of the present invention, the lower limit of the pressure difference ΔP set，down and the upper limit of the pressure difference ΔP set，up In practical applications, the determination is based on the characteristics of the pipeline network of the central air conditioning system being controlled.

[0081] As an example, firstly, the lower limit value ΔT of the real-time supply and return water temperature difference is given. down =4℃ and the upper limit of the real-time supply and return water temperature difference ΔT up =6℃, preset chilled water supply and return water pressure difference setting ΔP set Given a pressure difference upper limit ΔP of 80 kPa. set，up =120 kPa and lower limit of pressure difference ΔP set，down =40kPa, pressure difference optimization coefficient a=10, when the supply and return water temperature difference ΔT<4℃, then the optimized supply and return water pressure difference setpoint is... If ΔT = 3, then When the supply and return water temperature difference is 4℃ < ΔT < 6℃, the optimized supply and return water pressure difference setting value is... When the supply and return water temperature difference is 6℃ < ΔT, the optimized supply and return water pressure difference setpoint is... If ΔT = 7, then If the optimized chilled water supply and return water pressure difference setting value The optimized chilled water supply and return water pressure difference setting value If the optimized chilled water supply and return water pressure difference setting value The optimized chilled water supply and return water pressure difference setting value

[0082] like Figure 2As shown, the present invention also provides an energy-saving optimization control method for a central air conditioning chilled water pump, which employs the aforementioned energy-saving optimization control system for a central air conditioning chilled water pump, characterized by comprising the following steps:

[0083] S1: Detect the real-time supply temperature of chilled water in the chilled water supply pipe 7 and the real-time return temperature of chilled water in the chilled water return pipe 8, and calculate the optimized supply and return pressure difference setpoint for chilled water.

[0084] S2: Detect the real-time supply pressure of chilled water in the chilled water supply pipe 7 and the real-time return pressure of chilled water in the chilled water return pipe 8 respectively, calculate the supply and return pressure difference of chilled water, and determine whether it is within the set value of the supply and return pressure difference of chilled water. If the deviation is within the specified range, then the operating frequency of the inverter 5 is controlled to remain unchanged from the previous output value; otherwise, proceed to S3.

[0085] S3: Compare the real-time supply and return water pressure difference with the set value of the supply and return water pressure difference. The operating frequency of the inverter 5 is recalculated using a PID algorithm after comparison, and then output to the inverter 5.

[0086] S4: The frequency converter 5 controls the speed of the chilled water pump 2 according to the operating frequency, and dynamically keeps the difference between the supply and return water parameters between the chilled water supply pipe 7 and the chilled water return pipe 8 within the preset deviation range of the supply and return water parameter setting values.

[0087] The energy-saving optimization control method for central air conditioning chilled water pumps of the present invention collects the supply parameters of chilled water in the chilled water supply pipe 7 and the return parameters of chilled water in the chilled water return pipe 8, calculates the difference between the supply and return parameters and the set values ​​of the supply and return parameters, and then calculates the operating frequency of the frequency converter 5 to control the speed of the chilled water pump 2. This dynamically keeps the difference between the supply and return parameters between the chilled water supply pipe 7 and the chilled water return pipe 8 within a preset deviation range of the set values ​​of the supply and return parameters, improving the accuracy and reliability of the calculation of the difference between the supply and return parameters. The difference between the supply and return parameters of chilled water can be automatically adjusted according to the real-time supply and return parameters of chilled water, improving the automation level of the entire system, reducing the system's response time to environmental changes, ensuring the safe and stable operation of the system, and reducing system energy consumption. This achieves energy-saving operation of the central air conditioning chilled water system. The algorithm is simple, the operation is stable and reliable, and it is suitable for installation and commissioning in actual engineering projects. It can be widely used in building air conditioning systems.

[0088] According to the above implementation method, the controller 13 calculates the operating frequency of the chilled water pump 2 based on the real-time supply water temperature, the real-time return water temperature, the real-time supply water pressure, and the supply-return water pressure difference. The controller 13 then controls the speed of the chilled water pump 2 through the frequency converter 5. By changing the flow rate of the chilled water, the supply-return water pressure difference is maintained within the preset deviation range of the supply-return water parameter settings. This not only accurately responds to changes in terminal load but also quickly tracks the terminal cooling demand. Under the premise of meeting the terminal cooling demand, the controller minimizes the energy consumption of the air conditioning chilled water system and achieves the goal of energy saving.

[0089] In one or more embodiments of the present invention, in step S1, the calculated optimized supply and return water pressure difference setpoint for the chilled water... Specifically, the steps include the following:

[0090] If ΔT>ΔT up ,but

[0091] If ΔT < ΔT down ,but

[0092] If ΔT down ≤ΔT≤ΔT up ,but

[0093] if but

[0094] if but

[0095] Where ΔT is the real-time supply and return temperature difference of chilled water, ΔT up ΔT represents the upper limit of the real-time supply and return water temperature difference for chilled water. down ΔP is the lower limit of the real-time supply and return water temperature difference for chilled water. set The preset differential pressure between chilled water supply and return is ΔP, where 'a' is the differential pressure optimization coefficient. set，up The upper limit of the adjustable differential pressure, ΔP set，down This is a settable lower limit value for differential pressure.

[0096] When the real-time supply and return temperature difference of chilled water ΔT is higher than the set upper limit value ΔT for the supply and return temperature difference of chilled water... up At that time, the optimized real-time supply and return water pressure difference setpoint To set the preset chilled water supply and return pressure difference value ΔP set The positive correction value is when the real-time supply and return water temperature difference ΔT of the chilled water is equal to the set upper limit value ΔT of the supply and return water temperature difference. upThe larger the difference, the lower the preset chilled water supply and return pressure difference setting ΔP. set The larger the positive correction range, the better the optimized chilled water supply and return water pressure difference setpoint. The larger the temperature difference, the higher the operating frequency of chilled water pump 2 will be, thereby reducing the supply and return water temperature difference to meet the cooling capacity supply at the terminal. When the real-time supply and return water temperature difference ΔT is lower than the set lower limit ΔT for the real-time supply and return water temperature difference... down At that time, the optimized real-time supply and return water pressure difference setpoint To set the preset chilled water supply and return pressure difference value ΔP set The negative correction value is when the real-time supply and return water temperature difference ΔT of the chilled water is different from the set lower limit value ΔT of the real-time supply and return water temperature difference. down The larger the difference, the lower the preset chilled water supply and return pressure difference setting ΔP. set The larger the negative correction magnitude, the greater the optimized chilled water supply and return water pressure difference setpoint. The smaller the value, the lower the operating frequency of chilled water pump 2 will be, thereby increasing the supply and return water temperature difference and further reducing the energy consumption of the chilled water pump; when the real-time supply and return water temperature difference ΔT is within the set lower limit value ΔT of the real-time supply and return water temperature difference. down and the upper limit of the real-time supply and return water temperature difference ΔT of the chilled water. up During this period, the optimized supply and return water pressure differential setpoints for chilled water are... Equal to the preset chilled water supply and return water pressure difference setting value ΔP set That is, the preset chilled water supply and return water pressure difference setting value ΔP is not used. set Make corrections.

[0097] In one or more embodiments of the present invention, the optimized supply and return water pressure difference setpoint for the chilled water is described. The range is from the lower limit of the differential pressure to the upper limit of the differential pressure, and when the supply and return water differential pressure setpoint of the chilled water is... Greater than the upper limit of the pressure difference ΔP set，up When this happens, the set value of the supply and return water pressure difference of the chilled water is determined. Equal to the upper limit of pressure difference ΔP set，up When the supply and return water pressure difference setpoint Less than the lower limit of pressure difference ΔP set，down When this happens, the set value of the supply and return water pressure difference of the chilled water is determined. Equal to the lower limit of the pressure difference ΔP set，down .

[0098] In one or more embodiments of the present invention, in steps S2 and S3, the preset deviation range of the supply and return water parameter setting values ​​is between ±3 kPa of the supply and return water parameter setting values.

[0099] In one or more embodiments of the present invention, the supply and return water parameter difference optimization module 14 uses a periodic calculation method when calculating the set value of the chilled water supply and return water pressure difference.

[0100] By using a periodic calculation method to calculate the set value of the differential pressure between chilled water supply and return water, the frequent entry of the supply and return water parameter difference optimization module 14 into the calculation can be avoided, which would cause frequent changes in the differential pressure set value and thus cause system oscillation.

[0101] In this embodiment, the calculation cycle is 10-30 minutes. A shorter cycle means the chilled water supply and return pressure difference setpoint optimization module 14 calculates more frequently, resulting in more precise on-demand control of the system's cooling capacity. However, this also leads to more frequent adjustments to the chilled water pump frequency, which is detrimental to the stable operation of the system. Optionally, a calculation cycle of 20 minutes is preferred, which ensures both the accuracy of water volume control and avoids frequent adjustments to the chilled water pump frequency, thus ensuring the stability of the system operation.

[0102] The present invention also provides a computer-readable storage medium storing computer instructions for causing a processor to execute the aforementioned energy-saving optimization control method for a central air conditioning chilled water pump.

[0103] The present invention also provides an energy-saving optimization control device for a central air conditioning chilled water pump, the central air conditioning chilled water pump energy-saving optimization control device comprising:

[0104] At least one processor and a storage medium, wherein the memory is communicatively connected to the processor;

[0105] The storage medium stores a computer program that can be executed by the at least one processor, and the computer program is executed by the at least one processor to enable the at least one processor to execute the central air conditioning chilled water pump energy-saving optimization control method.

[0106] The energy-saving optimization control system and method for central air conditioning chilled water pumps provided by this invention overcomes the problem in existing variable flow control technologies for chilled water pumps that cannot simultaneously meet the requirements of accurately responding to changes in terminal load and quickly tracking terminal cooling demand. Either differential pressure control is used, which can meet the cooling effect but has poor energy-saving performance, or temperature difference control is used, which has better energy-saving performance but slow response and cannot promptly meet the terminal cooling demand. The control method described in this invention has relatively simple steps, low computational load, and can optimize and correct the differential pressure setpoint based on the supply and return water temperature difference, thereby accurately controlling the operation of the chilled water pump. The algorithm is simple, the operation is stable and reliable, and it is suitable for installation and commissioning in actual engineering projects, and can be widely applied to building air conditioning systems. The overall structure of this invention is simple, and the sensors used are conventional temperature and pressure sensors, which are inexpensive, easy to install, and have a low overall construction cost.

[0107] The energy-saving optimization control system and method for central air conditioning chilled water pumps provided by this invention uses temperature sensors to measure the temperature of the supply and return water pipes. The accuracy and stability of the temperature sensors are higher than those of flow meters, while their procurement cost is also lower. Using temperature as the control target is more stable and reliable than using flow rate as the control target, with higher control accuracy and lower cost.

[0108] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An energy-saving optimization control system for a central air conditioning chilled water pump, characterized in that: The system includes a circulating water loop and a controller (13) formed by sequentially connecting a refrigeration unit (1), a chilled water pump (2) equipped with a frequency converter (5), a terminal air conditioning unit (3), and a water outlet valve (4) equipped with an electric actuator (6) for adjusting the opening degree. The refrigeration unit (1) and the chilled water pump (2) are connected to each other and the chilled water pump (2) and the terminal air conditioning unit (3) are connected through chilled water supply pipes (7). The terminal air conditioning unit (3) and the water outlet valve (4) and the water outlet valve (4) and the refrigeration unit (1) are connected through chilled water return pipes (8). The chilled water supply pipe (7) is equipped with a first sensor detection component and the chilled water return pipe (8) is equipped with a second sensor detection component. The frequency converter (5), the first sensor detection component and the second sensor detection component are electrically connected to the controller (13). The first sensing and detection component includes a first pressure sensor (9) and a first temperature sensor (11). The first pressure sensor (9) is used to detect the real-time water supply pressure of the chilled water in the chilled water supply pipe (7) in real time, and the first temperature sensor (11) is used to detect the real-time water supply temperature of the chilled water in the chilled water supply pipe (7) in real time and output it to the controller (13). The second sensing and detection component includes a second pressure sensor (10) and a second temperature sensor (12). The second pressure sensor (10) is used to detect the real-time return water pressure value of the chilled water in the chilled water return pipe (8), and the second temperature sensor (12) is used to detect the real-time return water temperature value of the chilled water in the return water pipe (8) and output it to the controller (13). The controller (13) is used to calculate the optimized supply and return water pressure difference setting value of chilled water based on the real-time supply water temperature value, the real-time return water temperature value and the upper and lower limits of the supply and return water temperature difference, calculate the real-time supply and return water pressure difference value based on the real-time supply water pressure value and the real-time return water pressure value, and determine the operating frequency of the frequency converter (5) based on the real-time supply and return water pressure difference value and the supply and return water pressure difference setting value; wherein, the upper limit of the supply and return water temperature difference is 4.5 to 6.5℃, and the lower limit of the supply and return water temperature difference is 3 to 4.5℃; The frequency converter (5) is used to control the speed of the chilled water pump (2) according to the working frequency, and to dynamically keep the supply and return water pressure difference between the chilled water supply pipe (7) and the chilled water return pipe (8) within the deviation range of the supply and return water pressure difference setting value. The controller (13) includes a supply and return water parameter difference optimization module (14), which calculates the optimized supply and return water pressure difference setpoint based on the real-time supply water temperature T1, the real-time return water temperature T2, and the upper and lower limits of the supply and return water temperature difference. The specific implementation is as follows: if ,but ; if ,but ; if ,but ; if ,but ; if ,but ; in, This refers to the real-time supply and return water temperature difference of the chilled water. This refers to the upper limit of the temperature difference between the supply and return water for chilled water. This represents the lower limit of the supply and return temperature difference for chilled water. The preset chilled water supply and return pressure difference setting value. For pressure differential optimization coefficient, The upper limit of the adjustable differential pressure is set. This is a configurable lower limit for differential pressure. The optimized supply and return water pressure difference setting value.

2. The central air conditioning chilled water pump energy-saving optimization control system according to claim 1, characterized in that: The controller (13) also includes a frequency conversion control module (15); The supply and return water parameter difference optimization module (14) is used to calculate the optimized supply and return water pressure difference setpoint based on the real-time supply water temperature T1, the real-time return water temperature T2, and the upper and lower limits of the supply and return water temperature difference. , and output to the frequency converter control module (15); The variable frequency control module (15) is used to calculate the real-time supply and return water pressure difference of the chilled water based on the real-time supply water pressure P1 and the real-time return water pressure P2, and to determine whether it is within the set value of the supply and return water pressure difference of the chilled water. If the deviation is within the specified range, then the operating frequency of the inverter (5) is maintained at the previous output value; otherwise, the real-time supply and return water pressure difference of the chilled water is compared with the set value of the supply and return water pressure difference of the chilled water. The operating frequency of the inverter (5) is recalculated by comparing the values ​​and the PID algorithm, and then output to the inverter (5).

3. The central air conditioning chilled water pump energy-saving optimization control system according to claim 2, characterized in that: The supply and return water parameter difference optimization module (14) uses a periodic calculation method when calculating the set value of the chilled water supply and return water pressure difference.

4. The central air conditioning chilled water pump energy-saving optimization control system according to claim 1, characterized in that: The optimized supply and return water pressure difference setting value of the chilled water The range is from the lower limit of the differential pressure to the upper limit of the differential pressure, and when the supply and return water differential pressure setpoint of the chilled water is... Greater than the upper limit of pressure difference When this happens, the set value of the supply and return water pressure difference of the chilled water is determined. equal to the upper limit of pressure difference When the supply and return water pressure difference setpoint Less than the lower limit of differential pressure When this happens, the set value of the supply and return water pressure difference of the chilled water is determined. equal to the lower limit of the pressure difference .

5. A method for energy-saving optimization control of a central air conditioning chilled water pump, employing the energy-saving optimization control system for a central air conditioning chilled water pump as described in any one of claims 1-4, characterized in that, Includes the following steps: S1: Detect the real-time supply temperature of chilled water in the chilled water supply pipe (7) and the real-time return temperature of chilled water in the chilled water return pipe (8), and calculate the optimized supply and return water pressure difference setpoint. , S2: Detect the real-time supply pressure of chilled water in the chilled water supply pipe (7) and the real-time return pressure of chilled water in the chilled water return pipe (8), calculate the supply and return pressure difference of chilled water, and determine whether it is within the set value of the supply and return pressure difference of chilled water. If the deviation is within the specified range, then the operating frequency of the inverter (5) is controlled to remain unchanged from the previous output value; otherwise, proceed to S3. S3: Compare the real-time supply and return water pressure difference with the set value of the supply and return water pressure difference. The operating frequency of the inverter (5) is recalculated by comparing the values ​​and using the PID algorithm, and then output to the inverter (5). S4: The inverter (5) controls the speed of the chilled water pump (2) according to the working frequency, and dynamically keeps the difference between the supply and return water parameters between the chilled water supply pipe (7) and the chilled water return pipe (8) within the preset deviation range of the supply and return water parameter setting value; Calculate the optimized supply and return water pressure difference setpoint. Specifically, the steps include the following: if ,but ; if ,but ; if ,but ; if ,but ; if ,but ; in, This refers to the real-time supply and return water temperature difference of the chilled water. This refers to the upper limit of the temperature difference between the supply and return water for chilled water. This represents the lower limit of the supply and return temperature difference for chilled water. The preset chilled water supply and return pressure difference setting value. For pressure differential optimization coefficient, The upper limit of the adjustable differential pressure is set. This is a configurable lower limit for differential pressure. The optimized supply and return water pressure difference setting value.

6. The energy-saving optimization control method for central air conditioning chilled water pumps according to claim 5, characterized in that: The optimized supply and return water pressure difference setting value for the chilled water The range is from the lower limit of the differential pressure to the upper limit of the differential pressure, and when the supply and return water differential pressure setpoint of the chilled water is... Greater than the upper limit of pressure difference When this happens, the set value of the supply and return water pressure difference of the chilled water is determined. equal to the upper limit of pressure difference When the supply and return water pressure difference setpoint Less than the lower limit of differential pressure When this happens, the set value of the supply and return water pressure difference of the chilled water is determined. equal to the lower limit of the pressure difference .

7. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions that are used to cause a processor to execute the energy-saving optimization control method for the central air conditioning chilled water pump as described in claim 5 or 6.

8. An energy-saving optimization control device for a central air conditioning chilled water pump, characterized in that, The energy-saving optimization control equipment for the central air conditioning chilled water pump includes: At least one processor and a storage medium, the storage medium being communicatively connected to the processor; The storage medium stores a computer program that can be executed by the at least one processor, and the computer program is executed by the at least one processor to enable the at least one processor to perform the central air conditioning chilled water pump energy-saving optimization control method according to claim 5 or 6.

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