Energy consumption balance management method and equipment for cooling tower fan and medium

Abstract

The invention discloses an energy consumption balance management method and device for a cooling tower fan and a medium, and belongs to the field of heat exchange.The energy consumption balance management method for the cooling tower fan comprises the following steps that the fan air volume and the cooling water flow corresponding to the maximum efficiency of a cooling tower are obtained, and according to the fan air volume and the cooling water flow, energy consumption balance management is conducted on the cooling tower fan; the optimal air-water ratio of the cooling tower is obtained, and the output frequency of a frequency converter of the draught fan is controlled based on the current cooling water flow and the optimal air-water ratio. The method has the beneficial effects that the output frequency of the frequency converter is adjusted by collecting the actual draught fan air volume in real time and comparing the actual draught fan air volume with the theoretical draught fan air volume, and the efficiency of the draught fan of the cooling tower is maintained; meanwhile, the error permissible range can be adjusted, and the situation that the actual fan air volume and the theoretical fan air volume cannot be within the error permissible range due to the output frequency adjusted by the frequency converter is avoided; through comparison of the first efficiency ratio and the second efficiency ratio, whether the actual fan air volume is collected and adjusted or not is selected, and the cost performance of energy consumption is high.

Description

Technical Field

[0001] The invention belongs to the field of heat exchange, and in particular relates to an energy consumption balance management method, equipment and medium for a cooling tower fan. Background Art

[0002] The cooling tower fan is a device that achieves effective cooling of circulating water by introducing air, water spraying, evaporation process and the interaction of these processes. It is mainly responsible for extracting the hot air that has undergone heat exchange in the cooling tower from the top and guiding the low-temperature air to enter from the air inlet of the cooling tower at the bottom, thereby achieving cooling of the circulating water.

[0003] In the prior art, a cooling tower fan control method, device, terminal equipment and storage medium (202011237635.5) will control the inverter to obtain the set fan air volume according to the cooling water flow rate and the optimal wind-water ratio of the cooling tower. However, it does not take into account the temperature rise of the fan motor during operation and whether the heat dissipation is timely, which leads to impedance changes. The fan air volume will change, and the efficiency of the cooling tower fan will decrease, which needs to be improved. Summary of the invention

[0004] Based on this, it is necessary to provide an energy balance management method, equipment and medium for a cooling tower fan to address the above-mentioned problems.

[0005] The embodiment of the present invention is implemented as follows: a method for managing energy consumption balance of a cooling tower fan, comprising the following steps: Obtain the fan air volume and cooling water flow rate corresponding to the maximum efficiency of the cooling tower, obtain the optimal air-water ratio of the cooling tower according to the fan air volume and cooling water flow rate, control the output frequency of the frequency converter of the fan based on the current cooling water flow rate and the optimal air-water ratio, and obtain the theoretical fan air volume under the current cooling water flow rate; The actual fan air volume is obtained, and based on the actual fan air volume and the theoretical fan air volume, the output frequency of the inverter is changed to change the actual fan air volume until the difference between the actual fan air volume and the theoretical fan air volume is within the allowable error range.

[0006] In one embodiment, the present invention provides a method for energy balance management of a cooling tower fan, wherein the actual fan air volume is obtained, and the output frequency of the frequency converter is changed based on the difference between the actual fan air volume and the theoretical fan air volume, and the actual fan air volume is changed until the difference between the actual fan air volume and the theoretical fan air volume is within the allowable error range. After the step, the method further includes: If changing the inverter output frequency cannot make the difference between the actual fan air volume and the theoretical fan air volume within the allowable error range, increase the allowable error range; If after increasing the allowable error range, the actual fan air volume and the theoretical fan air volume are still outside the allowable error range, an alarm will be issued to indicate that the cooling tower fan is operating abnormally (fan blades are damaged, bearing lubrication is unqualified, etc.).

[0007] In one embodiment, the present invention provides a method for energy balance management of a cooling tower fan, wherein the steps of obtaining the actual fan air volume, changing the output frequency of the inverter based on the difference between the actual fan air volume and the theoretical fan air volume, and changing the actual fan air volume until the difference between the actual fan air volume and the theoretical fan air volume is within the allowable error range specifically include: The actual fan air volume is obtained by measuring methods, including wind speed method, flow meter method, pressure method, temperature method, and sound wave method; Based on the actual fan air volume and the theoretical fan air volume, the output frequency of the inverter is changed step by step with the set step size (for example, the step size is set to 1HZ, and the output frequency is increased by 1HZ step by step) to change the actual fan air volume; When the difference between the actual fan air volume and the theoretical fan air volume is within the allowable error range, stop changing the output efficiency of the inverter.

[0008] In one embodiment, the present invention provides a method for energy balance management of a cooling tower fan, wherein the output frequency of the frequency converter is gradually changed with a set step length based on the actual fan air volume and the theoretical fan air volume, and the step of changing the actual fan air volume specifically includes: If the actual fan air volume is less than the theoretical fan air volume, the output frequency of the inverter is changed step by step with the set step length to change the actual fan air volume; If the actual fan air volume is greater than the theoretical fan air volume, the actual fan air volume and the theoretical fan air volume are judged again after an interval. If the actual fan air volume is still greater than the theoretical fan air volume, an alarm is issued to indicate that the cooling tower fan is working abnormally (judging that the fan internal resistance is abnormal, the inverter is abnormal, the power supply is abnormal, etc.).

[0009] In one embodiment, the present invention provides a method for energy balance management of a cooling tower fan, wherein the actual fan air volume is obtained, and the output frequency of the frequency converter is changed based on the actual fan air volume and the theoretical fan air volume, and the actual fan air volume is changed until the difference between the actual fan air volume and the theoretical fan air volume is within the allowable error range. After the step, the method further includes: The energy consumption of obtaining the actual fan air volume and adjusting the actual fan air volume under different cooling water flow rates is counted, and the fan energy consumption under different cooling water flow rates is added to obtain the first energy consumption under different cooling water flow rates; the ratio of the first energy consumption under different cooling water flow rates to the first energy consumption under different cooling water flow rates is the first efficiency ratio under different cooling water flow rates; The energy consumption under the actual unregulated fan air volume under different cooling water flow rates is statistically analyzed to obtain the second energy consumption under different cooling water flow rates; the ratio of the second energy consumption under different cooling water flow rates to the second energy consumption under different cooling water flow rates is the second efficiency ratio under different cooling water flow rates; By comparing the first efficiency ratio and the second efficiency ratio, when facing different cooling water flow rates in the future, it is selected whether to obtain and change the actual fan air volume.

[0010] In one embodiment, the present invention provides a method for energy balance management of a cooling tower fan, wherein after comparing the first efficiency ratio and the second efficiency ratio, when facing different cooling water flows, selecting whether to obtain and change the actual fan air volume, the method further includes: The first efficiency ratio and the second efficiency ratio are updated regularly.

[0011] In one embodiment, the present invention provides an energy balance management system for a cooling tower fan, comprising: Theoretical fan air volume acquisition module is used to obtain the fan air volume and cooling water flow corresponding to the maximum efficiency of the cooling tower, obtain the optimal air-water ratio of the cooling tower according to the fan air volume and cooling water flow, control the output frequency of the frequency converter of the fan based on the current cooling water flow and the optimal air-water ratio, and obtain the theoretical fan air volume under the current cooling water flow; The actual fan air volume adjustment module is used to obtain the actual fan air volume, and based on the actual fan air volume and the theoretical fan air volume, to change the output frequency of the inverter and the actual fan air volume until the difference between the actual fan air volume and the theoretical fan air volume is within the allowable error range.

[0012] In one embodiment, the present invention provides an energy balance management system for a cooling tower fan, further comprising: The error tolerance range changing module is used to increase the error tolerance range if changing the output frequency of the inverter cannot make the difference between the actual fan air volume and the theoretical fan air volume within the error tolerance range; The abnormal alarm module is used to alarm if the actual fan air volume and the theoretical fan air volume are still not within the allowable error range after the allowable error range is increased, indicating that the cooling tower fan is working abnormally (blade damage, bearing lubrication failure, etc.).

[0013] In one embodiment, the present invention provides an energy balance management system for a cooling tower fan, further comprising: A first efficiency ratio acquisition module is used to obtain the actual fan air volume under different cooling water flow rates, calculate the energy consumption of adjusting the actual fan air volume, and add the fan energy consumption under different cooling water flow rates to obtain the first energy consumption under different cooling water flow rates; the ratio of the first energy consumption under different cooling water flow rates to the first energy consumption under different cooling water flow rates is the first efficiency ratio under different cooling water flow rates; A second efficiency ratio acquisition module is used to collect statistics on the energy consumption of the unregulated actual fan air volume under different cooling water flow rates to obtain the second energy consumption under different cooling water flow rates; the ratio of the second energy consumption under different cooling water flow rates to the second energy consumption under different cooling water flow rates is the second efficiency ratio under different cooling water flow rates; The control selection module is used to select whether to obtain and change the actual fan air volume when facing different cooling water flow rates in the future by comparing the first efficiency ratio and the second efficiency ratio.

[0014] A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the processor executes the steps of the above-mentioned method for managing energy consumption balance of a cooling tower fan.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention adjusts the output frequency of the frequency converter to maintain the efficiency of the cooling tower fan by collecting the actual fan air volume in real time and comparing it with the theoretical fan air volume; at the same time, the allowable error range is adjusted to avoid the output frequency adjusted by the frequency converter failing to make the actual fan air volume and the theoretical fan air volume within the allowable error range; by comparing the first efficiency ratio and the second efficiency ratio, it is selected whether to collect and adjust the actual fan air volume, so that the energy consumption is cost-effective. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic flow chart of the first part of a method for managing energy consumption balance of a cooling tower fan provided in an embodiment of the present invention.

[0017] Figure 2 A schematic diagram of the second part of the flow chart of a method for managing energy consumption balance of a cooling tower fan provided in an embodiment of the present invention.

[0018] Figure 3 A schematic diagram of the process of obtaining and adjusting the actual fan air volume provided in an embodiment of the present invention.

[0019] Figure 4 A schematic diagram of the actual fan air volume change and feedback process provided by an embodiment of the present invention.

[0020] Figure 5 A schematic flow chart of the third part of a method for managing energy consumption balance of a cooling tower fan provided in an embodiment of the present invention.

[0021] Figure 6 A schematic flow chart of the fourth part of a method for managing energy consumption balance of a cooling tower fan provided in an embodiment of the present invention.

[0022] Figure 7 A schematic diagram of the first part of an energy balance management system for a cooling tower fan provided in an embodiment of the present invention.

[0023] Figure 8 A schematic diagram of the second part of an energy balance management system for a cooling tower fan provided in an embodiment of the present invention.

[0024] Fig. 9 A schematic diagram of the third part of an energy balance management system for a cooling tower fan provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0026] It is understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but unless otherwise specified, these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, without departing from the scope of this application, a first xx script may be referred to as a second xx script, and similarly, a second xx script may be referred to as a first xx script.

[0027] In one embodiment, Figure 1 As shown, a cooling tower fan energy balance management method (applied to an energy balance management system) includes the following steps: Step S1, obtaining the fan air volume and cooling water flow rate corresponding to the maximum efficiency of the cooling tower, obtaining the optimal air-water ratio of the cooling tower according to the fan air volume and cooling water flow rate, controlling the output frequency of the frequency converter of the fan based on the current cooling water flow rate and the optimal air-water ratio, and obtaining the theoretical fan air volume under the current cooling water flow rate; Step S2, obtaining the actual fan air volume, and changing the output frequency of the inverter based on the actual fan air volume and the theoretical fan air volume, so as to change the actual fan air volume until the difference between the actual fan air volume and the theoretical fan air volume is within the allowable error range.

[0028] Step S1 is a prior art, which has been disclosed in a cooling tower fan control method, device, terminal equipment and storage medium (202011237635.5), and will not be repeated here. The theoretical fan air volume is obtained by adjusting the output frequency of the inverter based on the current cooling water flow, but considering the temperature rise during the operation of the fan motor, whether the heat dissipation is timely leading to impedance changes, and the voltage changes caused by power supply fluctuations, these will cause the fan air volume to change after the output frequency of the inverter is determined, so the efficiency of the cooling tower fan will be reduced. Therefore, it is necessary to obtain the actual fan air volume to adjust the output frequency of the inverter. The method for obtaining the actual fan air volume can be the wind speed method, using an anemometer and other instruments to measure the wind speed at the fan outlet or in the air duct. For large fans, multiple measurement points can be directly selected at the fan outlet for wind speed measurement to ensure that the measurement points are evenly distributed over the entire cross section to improve the accuracy of the measurement results. Measure the cross-sectional area of ​​the air duct: accurately measure the width and height of the air duct and calculate the cross-sectional area of ​​the air duct. Calculate the air volume: According to the air volume calculation formula Q=Av (Q represents air volume, A represents the cross-sectional area of ​​the air duct, and v represents wind speed), substitute the measured wind speed and cross-sectional area of ​​the air duct into the formula to obtain the air volume of the fan. Based on the actual fan air volume and the theoretical fan air volume, change the output frequency of the inverter to adjust the actual fan air volume. Digital setting: Through the up and down keys on the inverter control panel or the touch screen interface, the required frequency value can be accurately set, and the frequency value can be gradually increased or decreased through the signal to achieve 1Hz, 1Hz adjustment. Analog input: Some advanced inverters support analog inputs, such as voltage or current signals. By changing the size of these input signals, the output frequency of the inverter can be continuously adjusted. In this case, the user can use an external signal generator or controller to provide precise analog input to achieve 1Hz, 1Hz step adjustment. Since the adjustment is limited by the precision of the inverter itself (the higher the precision of the inverter, the smaller the adjustment step, and the lower the precision of the inverter, the larger the adjustment step), the actual fan air volume will stop being changed when the difference between the actual fan air volume and the theoretical fan air volume is within the allowable error range.

[0029] In a preferred embodiment of the present invention, in step S1, the energy balance management system obtains the fan air volume and cooling water flow corresponding to the maximum efficiency of the cooling tower, obtains the optimal air-water ratio of the cooling tower based on the fan air volume and cooling water flow, controls the output frequency of the frequency converter of the fan based on the current cooling water flow and the optimal air-water ratio, and obtains the theoretical fan air volume under the current cooling water flow; In a preferred embodiment of the present invention, in step S2, the energy balance management system obtains the actual fan air volume by any method such as wind speed method, flow meter method, pressure method, temperature method, sound wave method, etc., and increases or decreases the output frequency of the inverter by comparing the actual fan air volume with the theoretical fan air volume, thereby changing the actual fan air volume until the difference between the actual fan air volume and the theoretical fan air volume is within the allowable error range, and stops changing the actual fan air volume.

[0030] In one embodiment, Figure 2 As shown, the present invention provides a method for energy consumption balance management of a cooling tower fan, wherein the step S2, obtaining the actual fan air volume, changing the output frequency of the inverter based on the difference between the actual fan air volume and the theoretical fan air volume, and changing the actual fan air volume until the difference between the actual fan air volume and the theoretical fan air volume is within the allowable error range, further comprises: Step S3, if changing the output frequency of the frequency converter cannot make the difference between the actual fan air volume and the theoretical fan air volume within the allowable error range, increase the allowable error range; Step S4, if the actual fan air volume and the theoretical fan air volume are still not within the allowable error range after the allowable error range is increased, an alarm is issued to indicate that the cooling tower fan is working abnormally (fan blades are damaged, bearing lubrication is unqualified, etc.).

[0031] Due to the precision limitation of the inverter itself, there is a situation where after adjusting the output frequency of the inverter, the difference between the actual fan air volume and the theoretical fan air volume is still not within the allowable error range. For example, the difference between the actual fan air volume and the theoretical fan air volume is qualified within the range of ±2%. Initially, the difference between the actual fan air volume and the theoretical fan air volume is -3%. After increasing the output frequency of the inverter by 1Hz, the difference between the actual fan air volume and the theoretical fan air volume is +3%. At this time, the precision limitation of the inverter itself will be taken into consideration, and the allowable error range will be increased, for example, modified to ±4%, so that the difference between the actual fan air volume and the theoretical fan air volume is within the allowable error range; if after increasing the allowable error range, adjusting the output frequency of the inverter still cannot make the actual fan air volume and the theoretical fan air volume within the allowable error range, it will be considered whether the cooling tower fan is working abnormally, and there are situations such as fan blade damage, unqualified bearing lubrication, insufficient power supply, etc., and an alarm prompt will be issued.

[0032] In one embodiment, Figure 3 As shown, the present invention provides a method for energy balance management of a cooling tower fan, wherein the step S2, obtaining the actual fan air volume, and changing the output frequency of the inverter based on the difference between the actual fan air volume and the theoretical fan air volume, and changing the actual fan air volume until the difference between the actual fan air volume and the theoretical fan air volume is within the allowable error range, specifically includes: Step S21, obtaining the actual fan air volume by a measurement method, wherein the measurement method includes a wind speed method, a flow meter method, a pressure method, a temperature method, and a sound wave method; Step S22, based on the actual fan air volume and the theoretical fan air volume, the output frequency of the frequency converter is changed step by step with a set step size (for example, the step size is set to 1 Hz, and the output frequency is increased by 1 Hz step by step), so as to change the actual fan air volume; Step S23, when the difference between the actual fan air volume and the theoretical fan air volume is within the allowable error range, stop changing the output efficiency of the inverter.

[0033] The actual fan air volume is obtained through measurement methods. Here, the flow meter method is used as an example. A suitable flow meter is selected, such as an orifice flow meter, a vortex flow meter, etc.; the flow meter is installed on the inlet and outlet pipes of the fan, and the installation position is ensured to be correct to avoid affecting the measurement results; the fan is started, and after it runs stably, the flow meter reading is read, and the fan air volume is obtained according to the calibration coefficient of the flow meter. Based on the actual fan air volume and the theoretical fan air volume, the output frequency of the inverter is changed step by step with the set step size.

[0034] It should be noted that when adjusting the output frequency of the inverter, too frequent frequency adjustment may affect the stability of the system. Therefore, in practical applications, it is necessary to determine the appropriate adjustment step and frequency according to the specific needs and stability requirements of the system. Different types of motors may respond differently to frequency changes. When adjusting the frequency, it is necessary to ensure that the selected motor can adapt to the required frequency change range. Therefore, the output frequency of the inverter will be limited, and the upper and lower limits of the output frequency will be set. When the upper and lower limits of the output frequency are reached, an indication will be given and the output frequency of the inverter will no longer be adjusted under the current cooling water flow.

[0035] In one embodiment, Figure 4 As shown, the present invention provides a method for energy balance management of a cooling tower fan, wherein the step S22, based on the actual fan air volume and the theoretical fan air volume, gradually changes the output frequency of the inverter with a set step length, and the step of changing the actual fan air volume specifically includes: Step S221, if the actual fan air volume is less than the theoretical fan air volume, the output frequency of the inverter is changed step by step with a set step size to change the actual fan air volume; Step S222, if the actual fan air volume is greater than the theoretical fan air volume, the actual fan air volume and the theoretical fan air volume are judged again after a first interval. If the actual fan air volume is still greater than the theoretical fan air volume, an alarm is issued to indicate that the cooling tower fan is working abnormally (judging that the fan internal resistance is abnormal, the inverter is abnormal, the power supply is abnormal, etc.).

[0036] Generally speaking, due to the wear and tear of the fan in daily use, the actual fan air volume will be smaller than the theoretical fan air volume. However, when the power grid fluctuates, the actual fan air volume will be greater than the theoretical fan air volume for a short period of time after the voltage increases. Therefore, it will be detected again after an interval. If the actual fan air volume is judged to be greater than the theoretical fan air volume both times, the cooling tower fan is operating abnormally. The abnormality includes but is not limited to a partial short circuit inside the fan, which reduces the impedance; the inverter is abnormal, resulting in a large output frequency; and the power supply is continuously abnormal.

[0037] In one embodiment, Figure 5 As shown, the present invention provides a method for energy consumption balance management of a cooling tower fan, wherein the step S2, obtaining the actual fan air volume, changing the output frequency of the inverter based on the actual fan air volume and the theoretical fan air volume, and changing the actual fan air volume until the difference between the actual fan air volume and the theoretical fan air volume is within the allowable error range, further comprises: Step S5, statistically analyzing the energy consumption of obtaining the actual fan air volume and adjusting the actual fan air volume under different cooling water flow rates, and adding the fan energy consumption under different cooling water flow rates to obtain the first energy consumption under different cooling water flow rates; the ratio of the first energy consumption under different cooling water flow rates to the first energy consumption under different cooling water flow rates is the first efficiency ratio under different cooling water flow rates; Step S6, statistically analyzing the energy consumption of the actual fan air volume without adjustment under different cooling water flow rates to obtain the second energy consumption under different cooling water flow rates; the ratio of the second energy consumption under different cooling water flow rates to the second energy consumption under different cooling water flow rates is the second efficiency ratio under different cooling water flow rates; Step S7, by comparing the first efficiency ratio and the second efficiency ratio, when facing different cooling water flow rates in the future, choose whether to obtain and change the actual fan air volume.

[0038] Adjust the actual fan air volume so that the difference between the actual fan air volume and the theoretical fan air volume is within the allowable error range. The cost-effectiveness of the cooling tower fan energy consumption to treat the cooling water flow rate is definitely improved. However, this cost-effectiveness improvement does not take into account the power loss during step 2. Therefore, by calculating the first efficiency ratio when performing step 2 (obtaining and changing the actual fan air volume) and the second efficiency ratio when not performing step 2 (not obtaining and changing the actual fan air volume), and by comparing the first efficiency ratio and the second efficiency ratio, it is determined which method is more efficient from the perspective of overall energy consumption, and a balance is achieved between energy consumption and the cost-effectiveness of cooling water flow treatment.

[0039] In one embodiment, Figure 6 As shown, the present invention provides a method for energy balance management of a cooling tower fan, wherein the step S7, by comparing the first efficiency ratio and the second efficiency ratio, after selecting whether to obtain and change the actual fan air volume when facing different cooling water flow rates, further comprises: Step S8, regularly updating the first efficiency ratio and the second efficiency ratio.

[0040] After calculating the first efficiency ratio and the second efficiency ratio under different cooling water flow rates, the calculation results can be directly used, and this method can be sampled in the future to realize the control of the cooling tower fan. However, considering the loss of the device, the first efficiency ratio and the second efficiency ratio will change. Therefore, it is necessary to regularly update the first efficiency ratio and the second efficiency ratio. The update time can be 1 week, 1 month, etc., and the update time can be adjusted according to the time situation.

[0041] In one embodiment, Figure 7 As shown, the present invention provides an energy balance management system for a cooling tower fan, comprising: Theoretical fan air volume acquisition module 1 is used to obtain the fan air volume and cooling water flow corresponding to the maximum efficiency of the cooling tower, obtain the optimal air-water ratio of the cooling tower according to the fan air volume and cooling water flow, control the output frequency of the frequency converter of the fan based on the current cooling water flow and the optimal air-water ratio, and obtain the theoretical fan air volume under the current cooling water flow; The actual fan air volume adjustment module 2 is used to obtain the actual fan air volume, and based on the actual fan air volume and the theoretical fan air volume, to change the output frequency of the inverter and the actual fan air volume until the difference between the actual fan air volume and the theoretical fan air volume is within the allowable error range.

[0042] Taking into account that the temperature of the fan rises and the resistance increases after the fan starts working, the actual fan air volume will be smaller than the initial stage. Therefore, the actual fan air volume will be detected, and the output frequency of the inverter will be changed according to the actual fan air volume and the theoretical fan air volume, thereby changing the actual fan air volume.

[0043] In one embodiment, Figure 8 As shown, the present invention provides an energy balance management system for a cooling tower fan, further comprising: The error tolerance range changing module 3 is used to increase the error tolerance range if changing the output frequency of the frequency converter cannot make the difference between the actual fan air volume and the theoretical fan air volume within the error tolerance range; The abnormal alarm module 4 is used to alarm if the actual fan air volume and the theoretical fan air volume are still not within the allowable error range after the allowable error range is increased, indicating that the cooling tower fan is working abnormally (blade damage, bearing lubrication failure, etc.).

[0044] The output frequency adjustment step of the inverter is affected by the precision of the inverter. Therefore, the allowable error range can be adjusted appropriately to meet the use of inverters with different precisions and have a wider application range.

[0045] In one embodiment, Fig. 9As shown, the present invention provides an energy balance management system for a cooling tower fan, further comprising: The first efficiency ratio acquisition module 5 is used to obtain the actual fan air volume under different cooling water flow rates, calculate the energy consumption of adjusting the actual fan air volume, and add the fan energy consumption under different cooling water flow rates to obtain the first energy consumption under different cooling water flow rates; the ratio of the first energy consumption under different cooling water flow rates to the first energy consumption under different cooling water flow rates is the first efficiency ratio under different cooling water flow rates; The second efficiency ratio acquisition module 6 is used to collect statistics on the energy consumption of the unregulated actual fan air volume under different cooling water flow rates to obtain the second energy consumption under different cooling water flow rates; the ratio of the second energy consumption under different cooling water flow rates to the second energy consumption under different cooling water flow rates is the second efficiency ratio under different cooling water flow rates; The control selection module 7 is used to select whether to obtain and change the actual fan air volume when facing different cooling water flow rates in the future by comparing the first efficiency ratio and the second efficiency ratio.

[0046] By calculating the first efficiency ratio and the second efficiency ratio, it is determined which mode has a higher working efficiency for the cooling tower fan, and this mode is used until the first efficiency ratio and the second efficiency ratio are updated.

[0047] In one embodiment, a computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the processor performs the following steps: Step S1, obtain the fan air volume and cooling water flow corresponding to the maximum efficiency of the cooling tower, obtain the optimal air-water ratio of the cooling tower based on the fan air volume and cooling water flow, control the output frequency of the frequency converter of the fan based on the current cooling water flow and the optimal air-water ratio, and obtain the theoretical fan air volume under the current cooling water flow.

[0048] Step S2, obtaining the actual fan air volume, and changing the output frequency of the inverter based on the actual fan air volume and the theoretical fan air volume, so as to change the actual fan air volume until the difference between the actual fan air volume and the theoretical fan air volume is within the allowable error range.

[0049] Step S3: if changing the output frequency of the frequency converter cannot make the difference between the actual fan air volume and the theoretical fan air volume within the allowable error range, increase the allowable error range.

[0050] Step S4, if the actual fan air volume and the theoretical fan air volume are still not within the allowable error range after the allowable error range is increased, an alarm is issued to indicate that the cooling tower fan is working abnormally (fan blades are damaged, bearing lubrication is unqualified, etc.).

[0051] Step S5, statistics are collected for obtaining the actual fan air volume and adjusting the actual fan air volume under different cooling water flow rates, and the fan energy consumption under different cooling water flow rates is added to obtain the first energy consumption under different cooling water flow rates; the ratio of the first energy consumption under different cooling water flow rates to the first energy consumption under different cooling water flow rates is the first efficiency ratio under different cooling water flow rates.

[0052] Step S6, statistics are collected on the energy consumption of the actual unregulated fan air volume under different cooling water flow rates to obtain the second energy consumption under different cooling water flow rates; the ratio of the second energy consumption under different cooling water flow rates to the second energy consumption under different cooling water flow rates is the second efficiency ratio under different cooling water flow rates.

[0053] Step S7, by comparing the first efficiency ratio and the second efficiency ratio, when facing different cooling water flow rates in the future, choose whether to obtain and change the actual fan air volume.

[0054] Step S8, regularly updating the first efficiency ratio and the second efficiency ratio.

[0055] It should be understood that, although each step in the flow chart of each embodiment of the present invention is shown in sequence according to the indication of the arrow, these steps are not necessarily performed in sequence according to the order indicated by the arrow. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be performed in other orders. Moreover, at least a portion of the steps in each embodiment may include a plurality of sub-steps or a plurality of stages, and these sub-steps or stages are not necessarily performed at the same time, but can be performed at different times, and the execution order of these sub-steps or stages is not necessarily performed in sequence, but can be performed in turn or alternately with at least a portion of other steps or sub-steps or stages of other steps.

[0056] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the program can be stored in a non-volatile computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application may include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0057] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0058] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

[0059] 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 and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0060] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A method for energy balance management of a cooling tower fan, characterized in that: The energy consumption balance management method of the cooling tower fan comprises the following steps: Obtain the fan air volume and cooling water flow rate corresponding to the maximum efficiency of the cooling tower, obtain the optimal air-water ratio of the cooling tower according to the fan air volume and cooling water flow rate, control the output frequency of the frequency converter of the fan based on the current cooling water flow rate and the optimal air-water ratio, and obtain the theoretical fan air volume under the current cooling water flow rate; The actual fan air volume is obtained, and based on the actual fan air volume and the theoretical fan air volume, the output frequency of the inverter is changed to change the actual fan air volume until the difference between the actual fan air volume and the theoretical fan air volume is within the allowable error range.

2. The energy consumption balance management method of the cooling tower fan according to claim 1 is characterized in that: The step of obtaining the actual fan air volume, and changing the output frequency of the frequency converter based on the difference between the actual fan air volume and the theoretical fan air volume, and changing the actual fan air volume until the difference between the actual fan air volume and the theoretical fan air volume is within the allowable error range, further includes: If changing the inverter output frequency cannot make the difference between the actual fan air volume and the theoretical fan air volume within the allowable error range, increase the allowable error range; If after increasing the allowable error range, the actual fan air volume and the theoretical fan air volume are still outside the allowable error range, an alarm will be issued to indicate that the cooling tower fan is operating abnormally.

3. The energy consumption balance management method of the cooling tower fan according to claim 1 is characterized in that: The step of obtaining the actual fan air volume, and changing the output frequency of the frequency converter based on the difference between the actual fan air volume and the theoretical fan air volume, and changing the actual fan air volume until the difference between the actual fan air volume and the theoretical fan air volume is within the allowable error range, specifically includes: The actual fan air volume is obtained by measuring methods, including wind speed method, flow meter method, pressure method, temperature method, and sound wave method; Based on the actual fan air volume and the theoretical fan air volume, the output frequency of the inverter is changed step by step with the set step size to change the actual fan air volume; When the difference between the actual fan air volume and the theoretical fan air volume is within the allowable error range, stop changing the output efficiency of the inverter.

4. The energy consumption balance management method of the cooling tower fan according to claim 3 is characterized in that: The step of gradually changing the output frequency of the frequency converter with a set step length based on the actual fan air volume and the theoretical fan air volume to change the actual fan air volume specifically includes: If the actual fan air volume is less than the theoretical fan air volume, the output frequency of the inverter is changed step by step with the set step length to change the actual fan air volume; If the actual fan air volume is greater than the theoretical fan air volume, the actual fan air volume and the theoretical fan air volume are judged again after an interval. If the actual fan air volume is still greater than the theoretical fan air volume, an alarm is issued to indicate that the cooling tower fan is operating abnormally.

5. The method for energy balance management of a cooling tower fan according to any one of claims 1 to 4, characterized in that: The step of obtaining the actual fan air volume, changing the output frequency of the frequency converter based on the actual fan air volume and the theoretical fan air volume, and changing the actual fan air volume until the difference between the actual fan air volume and the theoretical fan air volume is within the allowable error range, further includes: The energy consumption of obtaining the actual fan air volume and adjusting the actual fan air volume under different cooling water flow rates is counted, and the fan energy consumption under different cooling water flow rates is added to obtain the first energy consumption under different cooling water flow rates; the ratio of the first energy consumption under different cooling water flow rates to the first energy consumption under different cooling water flow rates is the first efficiency ratio under different cooling water flow rates; The energy consumption under the actual unregulated fan air volume under different cooling water flow rates is statistically analyzed to obtain the second energy consumption under different cooling water flow rates; the ratio of the second energy consumption under different cooling water flow rates to the second energy consumption under different cooling water flow rates is the second efficiency ratio under different cooling water flow rates; By comparing the first efficiency ratio and the second efficiency ratio, when facing different cooling water flow rates in the future, it is selected whether to obtain and change the actual fan air volume.

6. The energy consumption balance management method of the cooling tower fan according to claim 5, characterized in that: After the step of comparing the first efficiency ratio and the second efficiency ratio and selecting whether to obtain and change the actual fan air volume when facing different cooling water flow rates, the method further includes: The first efficiency ratio and the second efficiency ratio are updated regularly.

7. An energy balance management system for a cooling tower fan, characterized in that: The energy consumption balance management system of the cooling tower fan includes: Theoretical fan air volume acquisition module is used to obtain the fan air volume and cooling water flow corresponding to the maximum efficiency of the cooling tower, obtain the optimal air-water ratio of the cooling tower according to the fan air volume and cooling water flow, control the output frequency of the frequency converter of the fan based on the current cooling water flow and the optimal air-water ratio, and obtain the theoretical fan air volume under the current cooling water flow; The actual fan air volume adjustment module is used to obtain the actual fan air volume, and based on the actual fan air volume and the theoretical fan air volume, to change the output frequency of the inverter and the actual fan air volume until the difference between the actual fan air volume and the theoretical fan air volume is within the allowable error range.

8. The energy balance management system for cooling tower fans according to claim 7, characterized in that: The energy consumption balance management system of the cooling tower fan also includes: The error tolerance range changing module is used to increase the error tolerance range if changing the output frequency of the inverter cannot make the difference between the actual fan air volume and the theoretical fan air volume within the error tolerance range; The abnormal alarm module is used to alarm if the actual fan air volume and the theoretical fan air volume are still not within the allowable error range after the allowable error range is increased, indicating that the cooling tower fan is working abnormally.

9. The energy balance management system for cooling tower fans according to claim 7 or 8, characterized in that: The energy consumption balance management system of the cooling tower fan also includes: A first efficiency ratio acquisition module is used to obtain the actual fan air volume under different cooling water flow rates, calculate the energy consumption of adjusting the actual fan air volume, and add the fan energy consumption under different cooling water flow rates to obtain the first energy consumption under different cooling water flow rates; the ratio of the first energy consumption under different cooling water flow rates to the first energy consumption under different cooling water flow rates is the first efficiency ratio under different cooling water flow rates; A second efficiency ratio acquisition module is used to collect statistics on the energy consumption of the unregulated actual fan air volume under different cooling water flow rates to obtain the second energy consumption under different cooling water flow rates; the ratio of the second energy consumption under different cooling water flow rates to the second energy consumption under different cooling water flow rates is the second efficiency ratio under different cooling water flow rates; The control selection module is used to select whether to obtain and change the actual fan air volume when facing different cooling water flow rates in the future by comparing the first efficiency ratio and the second efficiency ratio.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the processor executes the steps of the method for energy balance management of a cooling tower fan according to any one of claims 1 to 6.

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