Cooling Tower Noise Reduction Method, System, Equipment and Storage Medium Based on Fan Frequency Conversion

Abstract

The present invention relates to the technical field of cooling towers, and in particular to a noise reduction method, system, device and storage medium for a cooling tower based on variable frequency of a fan. It includes: collecting thermal data, and based on the thermal data, obtaining the air volume value required to maintain the current cooling effect; determining the frequency value corresponding to the air volume value, where the frequency value refers to the lowest frequency value required to maintain the current cooling effect; obtaining the operation record of the cooling tower, and based on the operation record and the frequency value, determining the fan frequency threshold; the fan frequency threshold includes a frequency lower threshold and a frequency upper threshold; based on the fan frequency threshold and a preset control strategy, performing noise reduction control on the cooling tower; it can solve the problem that the noise reduction effect of using noise reduction equipment is single and the noise source cannot be controlled, resulting in poor noise reduction effect; it can achieve the control of the noise source, thereby improving the noise reduction effect.

Description

Technical Field

[0001] The present invention relates to the technical field of cooling towers, and in particular to a noise reduction method, system, device and storage medium for cooling towers based on fan frequency conversion. Background Art

[0002] In daily life and production, cooling towers can be seen everywhere. The large-scale use of cooling towers has also caused varying degrees of noise pollution. Especially in large public buildings, the installation quantity of cooling towers is huge, and their high noise has a great impact on the lives and work of surrounding residents.

[0003] The noise sources of cooling towers mainly include fan noise, mechanical noise and falling water noise. Among them, the falling water noise is generated when the water falling from the water spraying device of the cooling tower impacts the accumulated water in the tower body chassis, showing high-frequency characteristics and generally being covered by the fan noise; the mechanical noise is the noise generated when the gears of the reducer and the motor mesh and the electromagnetic noise, and the impact on the surrounding environment can generally be ignored; the fan noise is the main noise source of mechanical ventilation cooling towers and belongs to aerodynamic noise, which is positively correlated with the fan frequency. Therefore, good noise reduction requires minimizing the fan frequency as much as possible. However, the cooling effect of the cooling tower is positively correlated with the fan frequency. For every 1°C increase in the cooling water temperature, the COP of the chiller drops by about 3%, and the fan frequency needs to be increased as much as possible. Therefore, on the premise of ensuring the cooling effect, realizing the variable-frequency noise reduction of the cooling tower through the adjustment of the control strategy is the key and difficult problem to be solved in the noise monitoring and noise reduction technology of cooling towers.

[0004] Traditional cooling tower noise reduction methods include: using noise reduction equipment to reduce the noise of the cooling tower. For example, for cooling towers on lower floors, sound barriers or sound insulation covers can be used, mufflers can be installed at the top air outlet of the cooling tower, and sound-absorbing louvers can be installed on the sound insulation cover or sound barrier.

[0005] However, although using noise reduction equipment can produce a certain noise reduction effect in a single link, the control effect is relatively single, with great limitations, unable to control the noise source, and there is a problem of poor noise reduction effect. Summary of the Invention

[0006] The present application provides a noise reduction method, system, device and storage medium for cooling towers based on fan frequency conversion, which can solve the problem that the noise reduction effect of using noise reduction equipment is single and unable to control the noise source, resulting in poor noise reduction effect. The present application provides the following technical solutions:

[0007] In a first aspect, the present application provides a noise reduction method for a cooling tower based on fan frequency conversion, the method comprising:

[0008] Collecting thermal data, the thermal data including the inlet water temperature, outlet water temperature of the cooling tower and the wet bulb temperature of the current environment;

[0009] Based on the thermotechnical data, obtain the air volume value required to maintain the current cooling effect;

[0010] Determine the frequency value corresponding to the air volume value; the frequency value refers to the minimum frequency value required to maintain the current cooling effect;

[0011] Obtain the operation record of the cooling tower, where the operation record includes the fan frequency record, the energy consumption record corresponding to the fan frequency record, and the complaint record corresponding to the fan frequency;

[0012] Based on the operation record and the frequency value, determine the fan frequency threshold; the fan frequency threshold includes a frequency lower threshold and a frequency upper threshold; the frequency lower threshold is less than or equal to the frequency upper threshold; the frequency value is less than or equal to the frequency lower threshold;

[0013] Based on the fan frequency threshold and a preset control strategy, perform noise reduction control on the cooling tower; the preset control strategy includes an energy-saving control strategy, a balance control strategy, and a low-noise control strategy.

[0014] Optionally, the fan frequency threshold is the frequency upper threshold; the determining the fan frequency threshold based on the operation record and the frequency value includes:

[0015] Fit the fan frequency record and the energy consumption record to obtain a first change curve;

[0016] Based on the first change curve and the frequency value, determine the frequency upper threshold.

[0017] Optionally, the fan frequency threshold is the frequency lower threshold; the determining the fan frequency threshold based on the operation record and the frequency value includes:

[0018] Obtain the total number of complaints in the complaint record;

[0019] Determine the number of complaints corresponding to each frequency in the frequency record;

[0020] Based on the total number of complaints and the number of complaints corresponding to each frequency, obtain the complaint rate corresponding to each frequency;

[0021] Fit each frequency and the complaint rate corresponding to each frequency to obtain a second change curve;

[0022] Based on the second change curve and the frequency value, determine the frequency lower threshold.

[0023] Optionally, the preset control strategy is the balance control strategy; the performing noise reduction control on the cooling tower based on the fan frequency threshold and the preset control strategy includes:

[0024] Based on the preset balancing algorithm and the fan frequency threshold, an equilibrium fan frequency is obtained;

[0025] Based on the equilibrium fan frequency, noise reduction control is performed on the cooling tower.

[0026] Optionally, the preset control strategy is the energy-saving control strategy; the noise reduction control of the cooling tower based on the fan frequency threshold and the preset control strategy includes:

[0027] Performing noise reduction control on the cooling tower based on the upper frequency threshold.

[0028] Optionally, the preset control strategy is the low-noise control strategy; the noise reduction control of the cooling tower based on the fan frequency threshold and the preset control strategy includes:

[0029] Performing noise reduction control on the cooling tower based on the lower frequency threshold.

[0030] Optionally, the obtaining of the air volume value required to maintain the current cooling effect based on the thermal engineering data includes:

[0031] Based on the thermal engineering data and a preset cooling number function, a third change curve is obtained;

[0032] The third change curve is compared with a preset packing characteristic curve to obtain the air volume value.

[0033] In a second aspect, an electronic device is provided, including a memory, a controller, and a computer program stored on the memory and executable on the controller. When the controller executes the computer program, the steps of the above-mentioned cooling tower noise reduction method based on fan frequency conversion are implemented.

[0034] In a third aspect, a computer-readable storage medium is provided. A program is stored in the storage medium, and when the program is executed by a processor, it is used to implement the cooling tower noise reduction method based on fan frequency conversion provided in the first aspect.

[0035] In a fourth aspect, a cooling tower noise reduction system based on fan frequency conversion is provided, which is characterized in that it is applied to the cooling tower noise reduction control method described in the first aspect. The system includes: a data acquisition module, a data processing module, and a noise control module;

[0036] The data acquisition module is used to collect thermal engineering data, where the thermal engineering data includes the inlet water temperature, outlet water temperature of the cooling tower, and the wet bulb temperature of the current environment; obtain the operation record of the cooling tower, where the operation record includes a fan frequency record, an energy consumption record corresponding to the fan frequency record, and a complaint record corresponding to the fan frequency;

[0037] The data processing module is configured to, after receiving the thermotechnical data, obtain the air volume value required to maintain the current cooling effect based on the thermotechnical data; determine the frequency value corresponding to the air volume value, where the frequency value refers to the minimum frequency value required to maintain the current cooling effect; after receiving the operation record, determine the fan frequency threshold based on the operation record and the frequency value; the fan frequency threshold includes a lower frequency threshold and an upper frequency threshold; the lower frequency threshold is less than or equal to the upper frequency threshold; the frequency value is less than or equal to the lower frequency threshold;

[0038] The noise control module is configured to perform noise reduction control on the cooling tower based on the fan frequency threshold and a preset control strategy; the preset control strategy includes an energy-saving control strategy, a balance control strategy, and a low-noise control strategy.

[0039] The beneficial effects of the present application are as follows: Collect thermotechnical data, where the thermotechnical data includes the inlet water temperature, outlet water temperature of the cooling tower, and the wet bulb temperature of the current environment; obtain the air volume value required to maintain the current cooling effect based on the thermotechnical data; determine the frequency value corresponding to the air volume value; obtain the operation record of the cooling tower, where the operation record includes the fan frequency record, the energy consumption record corresponding to the fan frequency record, and the complaint record corresponding to the fan frequency; determine the fan frequency threshold based on the operation record and the frequency value; the fan frequency threshold includes a lower frequency threshold and an upper frequency threshold; the lower frequency threshold is less than or equal to the upper frequency threshold; the frequency value is less than or equal to the lower frequency threshold; perform noise reduction control on the cooling tower based on the fan frequency threshold and a preset control strategy; the preset control strategy includes an energy-saving control strategy, a balance control strategy, and a low-noise control strategy. It can solve the problem that the noise reduction effect of using noise reduction equipment is single, and it is impossible to control the noise source, resulting in poor noise reduction effect. By presetting the balance algorithm, the upper frequency threshold and the lower frequency threshold, the operating frequency of the cooling tower fan can be controlled, so as to control the noise source and improve the noise reduction effect.

[0040] In addition, by fitting the fan frequency and the energy consumption record corresponding to the fan frequency, a first change curve is obtained, and then the upper frequency threshold corresponding to the lowest energy consumption of the cooling tower unit is determined. By controlling the fan to operate according to the upper frequency threshold, the noise of the cooling tower fan can be reduced while ensuring the energy-saving rate of the cooling tower unit.

[0041] In addition, by fitting the fan frequency and the complaint rate record corresponding to the fan frequency, a second change curve is obtained, and then the highest fan frequency corresponding to a complaint rate of 0 is determined, that is, the lower frequency threshold. By controlling the fan to operate according to the lower frequency threshold, the noise of the cooling tower fan can be prevented from affecting the surrounding residents while ensuring the energy-saving rate of the cooling tower unit. Description of the Drawings

[0042] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0043] Figure 1 is a schematic structural diagram of a cooling tower noise reduction system based on fan frequency conversion provided by an embodiment of the present application;

[0044] Figure 2 is a flowchart of a cooling tower noise reduction method based on fan frequency conversion provided by an embodiment of the present application;

[0045] Figure 3 is a schematic diagram of a first change curve and a second change curve provided by an embodiment of the present application;

[0046] Figure 4 is a flowchart of a cooling tower noise reduction method based on fan frequency conversion provided by another embodiment of the present application;

[0047] Figure 5 is a block diagram of a cooling tower noise reduction device based on fan frequency conversion provided by an embodiment of the present application;

[0048] Figure 6 is a block diagram of an electronic device provided by an embodiment of the present application. Specific Embodiments

[0049] The following will clearly and completely describe the technical solutions of the present application in conjunction with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of them. The present application will be described in detail below with reference to the drawings and in conjunction with the embodiments. It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0050] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above drawings are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence.

[0051] In the present application, unless otherwise stated, the orientation words such as "up", "down", "top", "bottom" are usually in the direction shown in the drawings, or in the vertical, perpendicular or gravitational direction of the component itself; similarly, for the sake of easy understanding and description, "inside" and "outside" refer to the inside and outside relative to the contour of each component itself, but the above orientation words do not limit the present application.

[0052] Such as Figure 1As shown, the structural schematic diagram of the cooling tower noise reduction system based on fan frequency conversion provided by the embodiment of the present application. According to Figure 1 it can be known that the system includes a data acquisition module 110, a data processing module 120, and a noise control module 130.

[0053] The data acquisition module 110 is used to acquire thermal data and the operation records of the cooling tower.

[0054] Among them, the thermal data includes the inlet water temperature, outlet water temperature of the cooling tower, and the wet bulb temperature of the current environment; the operation records of the cooling tower include the fan frequency record, the energy consumption record corresponding to the fan frequency record, and the complaint record corresponding to the fan frequency.

[0055] As Figure 1 shown, the data acquisition module 110 includes a heat dissipation performance monitoring sub-module 1110, an operation record monitoring sub-module 1120, and a noise complaint monitoring sub-module 1130.

[0056] Among them, the heat dissipation performance monitoring sub-module 1120 can be a temperature sensor, which is used to monitor the inlet water temperature, outlet water temperature of the cooling tower, and the wet bulb temperature of the current environment, and obtain the inlet water temperature, outlet water temperature of the cooling tower, and the wet bulb temperature of the current environment.

[0057] The operation record monitoring sub-module 1120 is an electronic device physically connected or communicatively connected to the unit of the cooling tower. The operation record monitoring sub-module 1120 can be a mobile phone, a tablet computer, a computer, etc. The present embodiment does not limit the implementation manner of the operation record monitoring sub-module 1120.

[0058] The operation record monitoring sub-module 1120 is used to record the fan frequency of the unit and the energy consumption data corresponding to the fan frequency in real time.

[0059] The noise complaint monitoring sub-module 1130 is used to obtain the complaint record corresponding to the fan frequency.

[0060] In actual implementation, the complaint data can be input into the noise complaint monitoring sub-module 1130 after being manually sorted, or it can be the complaint data obtained by the noise complaint monitoring sub-module 1130 from the network.

[0061] In this embodiment, after the data acquisition module 110 acquires the thermal data and the operation records of the cooling tower, it sends the thermal data and the operation records of the cooling tower to the data processing module 120 through the gateway. At this time, the data acquisition module 110 is communicatively connected to the data processing module 120.

[0062] Among them, the data processing module 120 is an electronic device used for data processing. This electronic device can be a computer, a tablet computer, a server, etc. The present embodiment does not limit the implementation manner of the data processing module 120.

[0063] After receiving the thermal engineering data, the data processing module 120 obtains the air volume value required to maintain the current cooling effect based on the thermal engineering data; determines the frequency value corresponding to the air volume value; after receiving the operation record, determines the fan frequency threshold based on the operation record and the frequency value.

[0064] Among them, the fan frequency threshold includes a lower frequency threshold and an upper frequency threshold; the lower frequency threshold is less than or equal to the upper frequency threshold; the frequency value is less than or equal to the lower frequency threshold.

[0065] In this embodiment, the frequency value corresponding to the air volume value refers to the operating frequency value of the fan of the cooling tower to maintain the current cooling effect; the upper frequency threshold refers to the operating frequency value of the fan when the unit energy consumption of the cooling tower no longer decreases, that is, when the fan frequency is greater than or equal to the upper frequency threshold, the unit energy consumption of the cooling tower no longer decreases; the lower frequency threshold refers to the operating frequency value of the fan when the number of complaints is 0, that is, when the operating frequency of the fan is lower than or equal to the lower frequency threshold, the number of complaints is 0.

[0066] After the data processing module 120 obtains the fan frequency threshold based on the thermal engineering data and the operation record, it sends the frequency value corresponding to the air volume value and the fan frequency threshold to the noise control module 130. At this time, a communication connection or a physical connection is established between the data processing module 120 and the noise control module 130.

[0067] After receiving the fan frequency threshold and the frequency value corresponding to the air volume value, the noise control module 130 performs noise reduction control on the cooling tower based on the fan frequency threshold, the frequency value, and the preset control strategy.

[0068] Among them, the preset control strategy includes an energy-saving control strategy, a balanced control strategy, and a low-noise control strategy.

[0069] Specifically, as Figure 1 shown, the noise control module 130 includes an integrated controller 1310 and an inverter 1320.

[0070] Among them, the integrated controller 1310 is used to obtain the control strategy selected by the current user in the preset control strategy after receiving the fan frequency threshold and the frequency value corresponding to the air volume value sent by the data processing module, determine the fan frequency based on the control strategy selected by the current user, and control the fan to operate at the determined fan frequency by controlling the inverter 1320, thereby realizing the noise control of the cooling tower.

[0071] In actual implementation, the cooling tower noise reduction system based on fan frequency conversion further includes a noise detection sub-module, which is used to detect the noise around the cooling tower to detect the effect of the noise control module 130 on the cooling tower noise reduction control.

[0072] The noise reduction system for cooling towers based on fan frequency conversion provided in this embodiment collects thermal data through a data acquisition module, obtains the operation records of the cooling tower, and transmits them to a data processing module; the data processing module processes the thermal data to obtain the air volume value required to maintain the current cooling effect; determines the frequency value corresponding to the air volume value, and determines the fan frequency threshold based on the operation records and the frequency value; the noise control module performs noise reduction control on the cooling tower based on the fan frequency threshold and a preset control strategy; it can solve the problem that the noise reduction control effect is single, the noise source cannot be controlled, resulting in poor noise reduction effect. By presetting an equalization algorithm, an upper frequency threshold, and a lower frequency threshold, and controlling the operating frequency of the cooling tower fan, the noise source can be controlled, thereby improving the noise reduction effect.

[0073] The following provides a detailed introduction to the noise reduction method for cooling towers based on fan frequency conversion provided in this application.

[0074] As Figure 2 shown, an embodiment of this application provides a noise reduction method for cooling towers based on fan frequency conversion, which at least includes the following steps:

[0075] Step 201: Collect thermal data, where the thermal data includes the inlet water temperature, outlet water temperature of the cooling tower, and the wet bulb temperature of the current environment.

[0076] In this embodiment, the inlet water temperature, outlet water temperature of the cooling tower, and the wet bulb temperature of the current environment are collected through temperature sensors.

[0077] Among them, the inlet water temperature refers to the water temperature measured in the inlet pipe of the cooling tower; the outlet water temperature refers to the water temperature measured in the water storage tank of the cooling tower; the wet bulb temperature of the current environment refers to the wet bulb temperature at the air inlet of the cooling tower.

[0078] Step 202: Based on the thermal data, obtain the air volume value required to maintain the current cooling effect.

[0079] In order to ensure that the cooling effect of the cooling tower can still reach the current cooling effect after noise reduction control, it is necessary to obtain the air volume value required to maintain the current cooling effect, and then determine the frequency value of the fan of the cooling tower to maintain the current cooling effect through the air volume value.

[0080] Specifically, obtaining the air volume value required to maintain the current cooling effect based on the thermal data includes: obtaining a third change curve based on the thermal data and a preset cooling number function; comparing the third change curve with a preset packing characteristic curve to obtain the air volume value.

[0081] Among them, obtaining a third change curve based on the thermal data and a preset cooling number function includes at least steps S11 - S12:

[0082] Step S11, calculate the average temperature of the inlet water temperature and the outlet water temperature, which is expressed by the following formula:

[0083]

[0084] where, t 1 is the inlet water temperature of the cooling tower, with the unit of °C; t 2 is the outlet water temperature of the cooling tower, with the unit of °C; t m is the average water temperature of the cooling tower, with the unit of °C.

[0085] Step S12, set multiple different air-water ratios, and obtain the third change curve through a preset cooling number function.

[0086] Among them, the air-water ratio is G / W, that is, the ratio of the air volume G of the fan to the cooling water volume W of the cooling tower; the third change curve is the cooling number-air-water ratio curve.

[0087] The preset cooling number function is expressed by the following formula:

[0088]

[0089] In the formula, N is the cooling number, which is a dimensionless number; c is the specific heat of air, with the unit of kJ / (kg·°C); K is the heat evaporation coefficient; i 1 is the enthalpy at the air inlet of the cooling tower, with the unit of kJ / kg, which can be obtained by querying the wet air parameter table through the wet bulb temperature; i2 is the enthalpy at the air outlet of the cooling tower, with the unit of kJ / kg; i m is the average value of the enthalpy at the air inlet and the air outlet in the cooling tower, i 1 ″ is the saturated air enthalpy corresponding to the inlet water temperature t1, with the unit of kJ / kg, which can be obtained by querying the wet air parameter table through the inlet water temperature t1; i 2 ″ is the saturated air enthalpy corresponding to the outlet water temperature t 2 , with the unit of kJ / kg, which can be obtained by querying the wet air parameter table through the outlet water temperature t 2 ; i m ″ is the saturated air enthalpy corresponding to the average water temperature t m , with the unit of kJ / kg, which can be obtained by querying the wet air parameter table through the average water temperature t m .

[0090] Among them, i 2 can be expressed by the following formula:

[0091]

[0092] In the formula, i 1 is the enthalpy at the air inlet of the cooling tower, with the unit of kJ / kg; c is the specific heat of air, with the unit of kJ / (kg·°C); K is the heat evaporation coefficient; t1 is the inlet water temperature of the cooling tower, with the unit of °C; t 2 is the outlet water temperature of the cooling tower, with the unit of °C; W / G is the reciprocal of the gas-water ratio G / W set with multiple different values.

[0093] After obtaining the third change curve, compare the third change curve with the preset packing characteristic curve to obtain the intersection point of the third change curve and the preset packing characteristic curve, and this intersection point is the gas-water ratio intersection point.

[0094] After obtaining the gas-water ratio intersection point, based on the gas-water ratio intersection point and the cooling water volume of the cooling tower, the air volume value required to maintain the current cooling effect can be obtained.

[0095] Step 203, determine the frequency value corresponding to the air volume value, and the frequency value refers to the minimum frequency value required to maintain the current cooling effect.

[0096] Step 204, obtain the operation record of the cooling tower, and the operation record includes the fan frequency record, the energy consumption record corresponding to the fan frequency record, and the complaint record corresponding to the fan frequency.

[0097] Step 205, based on the operation record and the frequency value, determine the fan frequency threshold.

[0098] Among them, the fan frequency threshold includes a frequency lower threshold and a frequency upper threshold; the frequency lower threshold is less than or equal to the frequency upper threshold; the frequency value is less than or equal to the frequency lower threshold.

[0099] Specifically, based on the operation record and the frequency value, determining the fan frequency threshold includes the following two aspects:

[0100] The first aspect, determining the frequency upper threshold, includes at least steps S21 - S22:

[0101] Step S21, fit the fan frequency record and the energy consumption record to obtain the first change curve;

[0102] Step S22, based on the first change curve and the frequency value, determine the frequency upper threshold.

[0103] In this embodiment, analyze the collected fan frequency record and the energy consumption record corresponding to the fan frequency record to obtain an energy consumption change curve at different frequencies.

[0104] For example: referring to Figure 3 , Figure 3 includes the change curve, that is, the first change curve. Among them, E is the fan energy consumption, is the fan frequency corresponding to the fan energy consumption. It can be seen from the first change curve that the energy consumption of the cooling tower unit is inversely proportional to the fan frequency, that is, the energy consumption of the cooling tower unit decreases as the fan frequency increases. However, it can also be seen from the first change curve that there is a frequency threshold in the first change curve that is, when the fan frequency reaches the frequency threshold the energy consumption of the cooling tower unit can be regarded as no longer decreasing. At this time, the frequency threshold is determined as the upper frequency threshold.

[0105] In addition, in order to ensure that the fan can maintain the current cooling effect, the determined upper frequency threshold should be greater than or equal to the frequency value.

[0106] In the second aspect, determining the lower frequency threshold includes at least steps S31 - S35:

[0107] Step S31, obtaining the total number of complaints in the complaint record;

[0108] Step S32, determining the number of complaints corresponding to each frequency in the frequency record;

[0109] Step S33, obtaining the complaint rate corresponding to each frequency through the total number of complaints and the number of complaints corresponding to each frequency;

[0110] Step S34, fitting each frequency and the complaint rate corresponding to each frequency to obtain a second change curve;

[0111] Step S35, determining the lower frequency threshold based on the second change curve and the frequency value.

[0112] In this embodiment, the obtained fan frequency record and the complaint record corresponding to the fan frequency are analyzed to obtain a complaint change curve at different frequencies.

[0113] The complaint data under different fan frequency conditions obtained is processed. The number of complaints corresponding to different fan frequencies is compared with the total number of complaints to obtain the complaint rate corresponding to different fan frequencies; then, through fitting and analyzing the fan frequency and the complaint rate, a noise complaint rate fitting curve at different frequencies is obtained, that is, the second change curve.

[0114] For example: Refer to Figure 3 , Figure 3 which includes a change curve, that is, the second change curve. Among them, X is the complaint rate, is the fan frequency corresponding to the complaint rate. It can be seen from the second change curve that after the fan frequency reaches the frequency threshold the complaint rate is positively correlated with the fan frequency, that is, the complaint rate increases as the fan frequency increases; after reaching the frequency threshold Previously, the complaint rate was 0, and the frequency threshold was determined as the lower frequency threshold.

[0115] In addition, to ensure that the fan can maintain the current cooling effect, the determined lower frequency threshold should be greater than or equal to the frequency value.

[0116] Step 206: Based on the fan frequency threshold and the preset control strategy, perform noise reduction control on the cooling tower.

[0117] Among them, the preset control strategy includes an energy-saving control strategy, a balance control strategy, and a low-noise control strategy.

[0118] Relatively speaking, performing noise reduction control on the cooling tower based on the fan frequency threshold and the preset control strategy includes the following situations:

[0119] First, the preset control strategy is a balance control strategy, which at least includes steps S41 - S42:

[0120] Step S41: Based on the preset balance algorithm and the fan frequency threshold, obtain the balanced fan frequency;

[0121] Step S42: Based on the balanced fan frequency, perform noise reduction control on the cooling tower.

[0122] Among them, the preset balance algorithm is a pre-set algorithm, which is represented by the following formula:

[0123]

[0124] In the formula, is the lower frequency threshold; is the upper frequency threshold, is the balanced fan frequency; λ is the balance coefficient.

[0125] Among them, the core of the balance algorithm lies in the balance coefficient λ, and its magnitude represents the proportion of noise reduction. The larger λ is, the more the frequency output by the algorithm tends to noise reduction; if λ is smaller, it means that the frequency output by the algorithm tends to energy conservation.

[0126] In actual implementation, the value of λ can be adjusted according to the actual situation.

[0127] For example: when the noise of the cooling tower is too large, resulting in an increase in public complaints, the fan frequency can be adjusted by increasing the value of λ to reduce the noise; when the complaint rate of the surrounding people is relatively low, the value of λ can be appropriately reduced to improve the energy-saving rate of the unit.

[0128] Second, the preset control strategy is an energy-saving control strategy, and noise reduction control is performed on the cooling tower based on the upper frequency threshold.

[0129] To achieve energy conservation of the cooling tower unit, that is, to achieve the best cooling effect of the fan, the λ value can be controlled to 0 at this time, that is, the frequency of the fan of the cooling tower is controlled to the upper threshold of the frequency.

[0130] Thirdly, the preset control strategy is a low-noise control strategy; at this time, noise reduction control is performed on the cooling tower based on the lower threshold of the frequency.

[0131] To reduce the impact of the noise of the cooling tower on the surrounding residents and avoid complaints from the residents around the cooling tower, it is necessary to reduce the noise of the fan of the cooling tower. At this time, the λ value can be controlled to 1, that is, the frequency of the fan of the cooling tower is controlled to the upper threshold of the frequency.

[0132] In summary, the noise reduction method for the cooling tower based on fan frequency conversion provided in this embodiment collects thermal data, and the thermal data includes the inlet water temperature, outlet water temperature of the cooling tower, and the wet bulb temperature of the current environment; based on the thermal data, the air volume value required to maintain the current cooling effect is obtained; the frequency value corresponding to the air volume value is determined; the operation record of the cooling tower is obtained, and the operation record includes the fan frequency record, the energy consumption record corresponding to the fan frequency record, and the complaint record corresponding to the fan frequency; based on the operation record and the frequency value, the fan frequency threshold is determined; the fan frequency threshold includes the lower threshold of the frequency and the upper threshold of the frequency; the lower threshold of the frequency is less than or equal to the upper threshold of the frequency; the frequency value is less than or equal to the lower threshold of the frequency; based on the fan frequency threshold and the preset control strategy, noise reduction control is performed on the cooling tower; the preset control strategy includes an energy-saving control strategy, a balance control strategy, and a low-noise control strategy. It can solve the problem that the noise reduction effect of using noise reduction equipment is single, and the noise source cannot be controlled, resulting in poor noise reduction effect. By presetting the balance algorithm, the upper threshold of the frequency and the lower threshold of the frequency, and controlling the operating frequency of the fan of the cooling tower, the noise source can be controlled, thereby improving the noise reduction effect.

[0133] In addition, by fitting the fan frequency and the energy consumption record corresponding to the fan frequency, a first change curve is obtained, and then the upper threshold of the frequency corresponding to the lowest energy consumption of the cooling tower unit is determined. By controlling the fan to operate at the upper threshold of the frequency, the noise of the fan of the cooling tower can be reduced while ensuring the energy-saving rate of the cooling tower unit.

[0134] In addition, by fitting the fan frequency and the complaint rate record corresponding to the fan frequency, a second change curve is obtained, and then the highest fan frequency corresponding to a complaint rate of 0 is determined, that is, the lower threshold of the frequency. By controlling the fan to operate at the lower threshold of the frequency, the impact of the noise of the fan of the cooling tower on the surrounding residents can be avoided while ensuring the energy-saving rate of the cooling tower unit.

[0135] To more clearly understand the noise reduction method for the cooling tower based on fan frequency conversion provided in this application, this embodiment gives an example of this method for illustration. Refer to Figure 4, the method at least includes the following steps:

[0136] Step 401, collect relevant data based on the acquisition module;

[0137] Step 402, obtain an adjustment range of the fan frequency based on the data processing module

[0138] Step 403, calculate the optimal value of the fan frequency based on the equalization algorithm

[0139] Step 404, determine whether the energy consumption of the unit is too large; if the energy consumption of the unit is too large, execute Step 408; otherwise, execute Step 405;

[0140] Step 405, determine whether the fan noise is too large; if the fan noise is too large, execute Step 407; otherwise, execute Step 406;

[0141] Step 406, balanced operation mode

[0142] Step 407, low-noise operation mode

[0143] Step 408, energy-saving operation mode

[0144] In summary, by presetting the equalization algorithm, the upper frequency threshold and the lower frequency threshold when the energy consumption of the unit is too large, control the operating frequency of the cooling tower fan to be while ensuring the energy-saving rate of the cooling tower unit, reduce the noise of the cooling tower fan. When the fan noise is too large, control the operating frequency of the cooling tower fan to be can avoid the influence of the noise of the cooling tower fan on the surrounding residents and ensure the energy-saving rate of the cooling tower unit.

[0145] This embodiment provides a noise reduction device for a cooling tower based on fan frequency conversion, as Figure 5 shown, the device includes at least the following modules: a thermal data acquisition module 510, an air volume value determination module 520, a frequency value determination module 530, an operation record acquisition module 540, a frequency threshold determination module 550, and a noise reduction control module 560;

[0146] The thermal data acquisition module 510 is used to collect thermal data, and the thermal data includes the inlet water temperature, outlet water temperature of the cooling tower, and the wet bulb temperature of the current environment;

[0147] The air volume value determination module 520 is used to obtain the air volume value required to maintain the current cooling effect based on the thermal data;

[0148] A frequency value determination module 530, configured to determine a frequency value corresponding to the air volume value;

[0149] An operation record acquisition module 540, configured to acquire an operation record of the cooling tower, where the operation record includes a fan frequency record, an energy consumption record corresponding to the fan frequency record, and a complaint record corresponding to the fan frequency;

[0150] A frequency threshold determination module 550, configured to determine a fan frequency threshold based on the operation record and the frequency value; the fan frequency threshold includes a lower frequency threshold and an upper frequency threshold; the lower frequency threshold is less than or equal to the upper frequency threshold; the frequency value is less than or equal to the lower frequency threshold;

[0151] A noise reduction control module 560, configured to perform noise reduction control on the cooling tower based on the fan frequency threshold and a preset control strategy; the preset control strategy includes an energy-saving control strategy, a balance control strategy, and a low-noise control strategy.

[0152] For related details, refer to the above method and embodiments.

[0153] It should be noted that: when the above-described cooling tower noise reduction device based on fan frequency conversion performs cooling tower noise reduction based on fan frequency conversion, only the above-mentioned division of each functional module is used for illustration. In actual application, the above functions can be allocated to different functional modules according to needs, that is, the internal structure of the cooling tower noise reduction device based on fan frequency conversion is divided into different functional modules to complete all or part of the functions described above. In addition, the above-described cooling tower noise reduction device based on fan frequency conversion and the embodiment of the cooling tower noise reduction method based on fan frequency conversion belong to the same concept. For the specific implementation process, refer to the method embodiment, which will not be elaborated here.

[0154] This embodiment provides an electronic device, as Figure 6 shown. The electronic device includes at least a processor 601 and a memory 602.

[0155] The processor 601 may include one or more processing cores, such as a 4-core processor, an 8-core processor, etc. The processor 601 may be implemented in at least one hardware form of DSP (Digital Signal Processing), FPGA (Field-Programmable Gate Array), or PLA (Programmable Logic Array). The processor 601 may also include a main processor and a coprocessor. The main processor is a processor for processing data in the wake state, also known as the CPU (Central Processing Unit); the coprocessor is a low-power processor for processing data in the standby state. In some embodiments, the processor 601 may be integrated with a GPU (Graphics Processing Unit), and the GPU is responsible for rendering and drawing the content to be displayed on the display screen. In some embodiments, the processor 601 may further include an AI (Artificial Intelligence) processor, which is used to process computational operations related to machine learning.

[0156] The memory 602 may include one or more computer-readable storage media, and the computer-readable storage media may be non-transitory. The memory 602 may further include high-speed random access memory and non-volatile memory, such as one or more disk storage devices and flash storage devices. In some embodiments, the non-transitory computer-readable storage medium in the memory 602 is used to store at least one instruction, and the at least one instruction is used to be executed by the processor 601 to implement the cooling tower noise reduction method based on fan frequency conversion provided in the method embodiments of the present application.

[0157] In some embodiments, the electronic device may further optionally include: a peripheral device interface and at least one peripheral device. The processor 601, the memory 602, and the peripheral device interface may be connected through a bus or signal lines. Each peripheral device may be connected to the peripheral device interface through a bus, signal lines, or a circuit board. Schematically, the peripheral devices include but are not limited to: a radio frequency circuit, a touch display screen, an audio circuit, and a power supply, etc.

[0158] Of course, the electronic device may also include fewer or more components, and this embodiment does not limit this.

[0159] Optionally, the present application further provides a computer-readable storage medium, and a program is stored in the computer-readable storage medium, and the program is loaded and executed by the processor to implement the cooling tower noise reduction method based on fan frequency conversion in the above method embodiments.

[0160] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered to be within the scope described in this specification. Obviously, the above-described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, those of ordinary skill in the art can make other different forms of changes or modifications without creative efforts, and all of them should fall within the scope of protection of this application.

Claims

1. A noise reduction method for a cooling tower based on frequency conversion of a fan, characterized in that, the method includes: collecting thermal data, where the thermal data includes the inlet water temperature, outlet water temperature of the cooling tower, and the wet bulb temperature of the current environment; based on the thermal data, obtaining the air volume value required to maintain the current cooling effect; determining the frequency value corresponding to the air volume value, where the frequency value refers to the lowest frequency value required to maintain the current cooling effect; obtaining the operation record of the cooling tower, where the operation record includes the fan frequency record, the energy consumption record corresponding to the fan frequency record, and the complaint record corresponding to the fan frequency; based on the operation record and the frequency value, determining the fan frequency threshold; the fan frequency threshold includes a lower frequency threshold and an upper frequency threshold; the lower frequency threshold is less than or equal to the upper frequency threshold; the frequency value is less than or equal to the lower frequency threshold; based on the fan frequency threshold and a preset control strategy, performing noise reduction control on the cooling tower; the preset control strategy includes an energy-saving control strategy, a balanced control strategy, and a low-noise control strategy.

2. The method according to claim 1, characterized in that, the fan frequency threshold is the upper frequency threshold; the determining the fan frequency threshold based on the operation record and the frequency value includes: fitting the fan frequency record and the energy consumption record to obtain a first change curve; based on the first change curve and the frequency value, determining the upper frequency threshold.

3. The method according to claim 1, characterized in that, the fan frequency threshold is the lower frequency threshold; the determining the fan frequency threshold based on the operation record and the frequency value includes: obtaining the total number of complaints in the complaint record; determining the number of complaints corresponding to each frequency in the frequency record; through the total number of complaints and the number of complaints corresponding to each frequency, obtaining the complaint rate corresponding to each frequency; fitting the each frequency and the complaint rate corresponding to each frequency to obtain a second change curve; based on the second change curve and the frequency value, determining the lower frequency threshold.

4. The method according to claim 1, characterized in that, the preset control strategy is the balanced control strategy; the performing noise reduction control on the cooling tower based on the fan frequency threshold and the preset control strategy includes: based on a preset balanced algorithm and the fan frequency threshold, obtaining a balanced fan frequency; based on the balanced fan frequency, performing noise reduction control on the cooling tower.

5. The method according to claim 1, characterized in that, the preset control strategy is the energy-saving control strategy; the performing noise reduction control on the cooling tower based on the fan frequency threshold and the preset control strategy includes: performing noise reduction control on the cooling tower based on the upper frequency threshold.

6. The method according to claim 1, characterized in that, the preset control strategy is the low-noise control strategy; the performing noise reduction control on the cooling tower based on the fan frequency threshold and the preset control strategy includes: performing noise reduction control on the cooling tower based on the lower frequency threshold.

7. The method according to claim 1, It is characterized in that obtaining the air volume value required to maintain the current cooling effect based on the thermal engineering data includes: obtaining a third change curve based on the thermal engineering data and a preset cooling number function; comparing the third change curve with a preset packing characteristic curve to obtain the air volume value.

8. An electronic device It is characterized in that the device includes a manager and a memory; a program is stored in the memory, and the program is loaded and executed by the manager to implement the cooling tower noise reduction method based on fan frequency conversion according to any one of claims 1 to 7.

9. A computer-readable storage medium It is characterized in that a program is stored in the storage medium, and when the program is executed by a manager, it is used to implement the cooling tower noise reduction method based on fan frequency conversion according to any one of claims 1 to 7.

10. A cooling tower noise reduction system based on fan frequency conversion It is characterized in that applied to the cooling tower noise reduction method based on fan frequency conversion according to any one of claims 1 to 7, the system includes: a data acquisition module, a data processing module, and a noise control module; the data acquisition module is used to acquire thermal engineering data, and the thermal engineering data includes the inlet water temperature, outlet water temperature of the cooling tower, and the wet bulb temperature of the current environment; obtain the operation record of the cooling tower, and the operation record includes the fan frequency record, the energy consumption record corresponding to the fan frequency record, and the complaint record corresponding to the fan frequency; the data processing module is used to, after receiving the thermal engineering data, obtain the air volume value required to maintain the current cooling effect based on the thermal engineering data; determine the frequency value corresponding to the air volume value, and the frequency value refers to the lowest frequency value required to maintain the current cooling effect; after receiving the operation record, determine the fan frequency threshold based on the operation record and the frequency value; the fan frequency threshold includes a frequency lower threshold and a frequency upper threshold; the frequency lower threshold is less than or equal to the frequency upper threshold; the frequency value is less than or equal to the frequency lower threshold; the noise control module is used to perform noise reduction control on the cooling tower based on the fan frequency threshold and a preset control strategy; the preset control strategy includes an energy-saving control strategy, a balanced control strategy, and a low-noise control strategy.

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