Temperature response type fan control system for improving energy efficiency of cooling tower

Abstract

The invention relates to a temperature response type fan control system for improving the energy efficiency of a cooling tower, which comprises the cooling tower and a cooling tower interior, and is characterized in that temperature sensors are arranged in a water collecting tank, a cooling tower water inlet, an automatic water replenishing tank and a cooling tower water outlet in the cooling tower interior to monitor the internal environment temperature in real time; meanwhile, monitored temperature data can be transmitted to an STM32 type controller in real time, and an advanced algorithm is built in the controller and used for processing the received temperature data; according to the data, an algorithm can calculate the optimal running speed of the current fan with the rotatable speed, and according to an instruction of the controller, the rotating speed of the permanent magnet motor is adjusted in real time to reach the speed of the fan with the variable speed; the cooling tower has the advantages that the energy efficiency and the performance of the cooling tower are improved, the cooling effect is further optimized by introducing the electric turning door plate and the intelligent sprayer, the operation cost and the maintenance requirement are reduced, and the system is more energy-saving and environment-friendly while efficient operation is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of condensing towers and relates to a temperature-responsive fan control system for improving the energy efficiency of a cooling tower. Background Art

[0002] The steam condensate generated during the vinegar production process is collected in the condensate storage tank and pumped to the hot water recovery tank for use in the spinning department. From a thermodynamic point of view, this part of condensate (at saturated temperature) contains 20%-30% of the total heat of steam (depending on the needs of the production process, the steam pressure or temperature is different), and it is also high-quality clean water. If it is discharged directly, it will be a great waste.

[0003] At present, high-quality steam resources are used for heating in winter, and the steam consumption is relatively large; in summer, due to the high temperature of circulating water, the compressor of the refrigeration system is in high-load operation for a long time, and the power consumption is high. In large petrochemical enterprises, after the steam releases the latent heat of vaporization in the steam-using equipment, it becomes saturated condensate at the same temperature and pressure. At present, there are two ways to deal with this part of the surplus condensate. One is to enter the circulating water system as supplementary water, and the other is to discharge it directly to the sewage treatment workshop. Both ways have great production risks and energy waste. First, in summer, high-temperature condensate enters the circulating water system, which will increase the load of the circulating water system, increase the temperature of the circulating water, and affect the normal production of the device; second, the condensate discharged to the sewage workshop, due to the high temperature, causes a large number of bacteria and algae in the sewage treatment system to die, seriously affecting the treatment capacity of the sewage system; third, the waste heat of the discharged condensate cannot be recycled.

[0004] Among them, in view of the high temperature of vinegar circulating water under summer working conditions, the large operating load of vinegar slice freezer and the low operating efficiency, based on the data collection of freezer operation every day in summer, it is concluded that the key is to use the fan in the cooling tower system to cool the circulating water; but traditional cooling tower systems often operate at a fixed fan speed without considering the actual cooling demand, which leads to a significant increase in energy consumption. This unchanging operating mode will cause energy waste under low load conditions. Therefore, it is necessary to develop a system that can adjust the fan speed according to the actual cooling demand. Summary of the invention

[0005] The object of the present invention is to solve the above-mentioned problems existing in the prior art and to provide a temperature-responsive fan control system for improving the energy efficiency of a cooling tower.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] A temperature-responsive fan control system for improving the energy efficiency of a cooling tower, comprising a cooling tower and a water collection tank inside the cooling tower, a cooling tower water inlet, an automatic water replenishment tank, and a cooling tower water outlet; and further comprising:

[0008] A temperature sensor is provided on the water collecting tank, the water inlet of the cooling tower, the automatic water replenishment tank, and the water outlet of the cooling tower. The temperature sensor is used to monitor the outlet water temperature, the water collecting tank temperature, or the inlet water temperature of the cooling tower in real time;

[0009] A variable speed fan, wherein the variable speed fan is arranged on the cooling tower and one end of the variable speed fan is connected to a motor for driving;

[0010] A frequency converter, the frequency converter being connected to the variable speed fan, and the frequency converter being used to adjust the operating frequency of the variable speed fan according to the water temperature after the operating frequency of the variable speed fan is started;

[0011] A controller, the controller is arranged in the cooling tower, the controller is used to receive the data monitored by the temperature sensor, calculate the optimal operating speed of the variable speed fan, and issue a control instruction to the frequency converter;

[0012] An electric flap panel is installed at the vent of the cooling tower, the flap panel is connected to the controller, and the controller automatically adjusts the opening and closing of the electric flap panel according to the temperature data monitored in real time by the temperature sensor;

[0013] Smart sprayer: The smart sprayer is installed inside the cooling tower, and the start and shut down of the smart sprayer are automatically adjusted by the controller.

[0014] Preferably, a PID algorithm is provided in the controller, and the PID algorithm is used to process the temperature data monitored by the received temperature sensor.

[0015] Preferably, the PID algorithm compares the target temperature set by the user with the temperature of the environment measured by the temperature sensor, calculates the temperature difference, and calculates the adjustment amount through integration, differentiation and proportional operations of this temperature difference, and controls the duty cycle of the PWM wave according to this adjustment amount.

[0016] Preferably, it also includes a wireless transmitter, which is used to quickly send the real-time temperature monitored by the temperature sensor to the controller, so as to adjust the speed of the variable-speed fan in real time.

[0017] Preferably, when the water temperature in the cooling tower is greater than a preset water temperature, the frequency converter increases the operating frequency of the variable speed fan; when the water temperature in the cooling tower is less than the preset water temperature, the frequency converter reduces the operating frequency of the variable speed fan.

[0018] Preferably, the controller adjusts the working states of the electric flap and the intelligent sprayer by introducing a PID algorithm to achieve intelligent control of the cooling tower and ensure optimal energy efficiency under various operating conditions.

[0019] Preferably, the temperature sensor is a DS18B20 digital temperature sensor.

[0020] Preferably, the controller uses an STM32F407ZGT6 chip with Cortex-M4 as the core.

[0021] Preferably, the wireless transmitter uses a new single-chip radio frequency transceiver device nRF24L01.

[0022] Preferably, the motor is a high-efficiency permanent magnet low-speed direct drive motor.

[0023] Preferably, it also includes a central control cabinet, which is arranged on the cooling tower;

[0024] Wherein, the central control cabinet is provided with a display screen and a multi-function control button; the display screen and the multi-function control button are electrically connected to the controller;

[0025] The display screen adopts an LCD touch screen for controlling and displaying temperature, fan speed, time, date and required information in real time;

[0026] The multifunctional control button includes key0, key1, key2, key3, key4 and key5;

[0027] Among them, key0 is used to set the preset water temperature and preset time;

[0028] Button key1 controls the variable speed fan to rotate at low speed;

[0029] Button key2 controls the variable speed fan to rotate at high speed;

[0030] Pressing key3 makes the variable speed fan work in temperature control state: when the temperature exceeds the set threshold 1, the variable speed fan automatically rotates at high speed; when the temperature exceeds the set threshold 2, the variable speed fan automatically moves at low speed; when the temperature is lower than the set threshold 3, the variable speed fan automatically stops rotating;

[0031] Key 4 controls the opening and closing state of the electric flap: according to the cooling demand, when the variable speed fan runs at high speed or the temperature is high, the electric flap automatically opens; when the variable speed fan runs at low speed or the temperature is low, the electric flap automatically closes;

[0032] Press key5 to control the smart sprayer: based on the monitored water temperature, when the water temperature exceeds the set value, the smart sprayer automatically starts and performs additional cooling through vaporized water mist; when the temperature drops below the set value, the smart sprayer automatically shuts down to save water resources.

[0033] Due to the adoption of the above technical solution, the beneficial effects obtained by the present invention include:

[0034] 1. Improve energy efficiency: By dynamically adjusting fan speed based on real-time temperature data, the system can significantly reduce unnecessary energy consumption; this intelligent adjustment method is more efficient than traditional fixed-speed fans, especially under low load or low ambient temperature conditions, it can significantly reduce power consumption;

[0035] 2. Optimize cooling performance: The system can automatically adjust the fan speed according to the cooling demand to ensure that the cooling tower can maintain the best cooling effect under different working conditions; this means that when the heat load changes, the system can respond quickly to ensure that the cooling efficiency is always in the best state;

[0036] 3. Extend equipment life: By preventing the fan from running at maximum speed for a long time, this system helps reduce the wear and tear of the fan and other cooling tower components, thereby extending the service life of the equipment;

[0037] 4. Reduce maintenance costs: Since the fan runs more smoothly and the failure rate is reduced, the maintenance cost and time are also reduced accordingly; in addition, the real-time monitoring function of the system can also help to timely discover and solve potential problems, further reducing maintenance costs;

[0038] 5. Environmentally friendly: Reducing energy consumption not only reduces operating costs, but also reduces carbon emissions and environmental impact, which is in line with the current trend of environmental protection and sustainable development;

[0039] 6. Improve system adaptability: Since the system can adjust its operation according to the actual cooling demand, it has higher adaptability to environmental changes, and can ensure efficient operation regardless of seasonal changes or different industrial application scenarios;

[0040] 7. Simplified operation and monitoring: The system's intelligent control can reduce reliance on manual operation. At the same time, through the integrated monitoring function, operators can more easily track system performance and perform fault diagnosis. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a structural diagram of an embodiment of a temperature-responsive fan control system for improving the energy efficiency of a cooling tower according to the present invention.

[0042] Figure 2 It is a structural diagram of an embodiment of a cooling tower of the present invention.

[0043] Figure 3 It is a structural diagram of an embodiment of a central control cabinet of the present invention.

[0044] Figure 4 This is a main program flow chart of an embodiment of the present invention.

[0045] Figure 5 FIG. 4 is a temperature control flow chart of an embodiment of the present invention.

[0046] Figure 6 FIG. 4 is a flow chart of a PID algorithm according to an embodiment of the present invention.

[0047] Figure 7 The figure is a flow chart of temperature control and speed regulation according to an embodiment of the present invention.

[0048] The reference numerals are as follows:

[0049] 1. Motor; 2. Variable speed fan; 3. Water collection tank; 4. Temperature sensor;

[0050] 5. Automatic water replenishment pool; 6. Cooling tower water inlet; 7. Cooling tower water outlet; 8. Controller;

[0051] 9. Central control cabinet; 91. Display screen; 92. Multi-function control button;

[0052] 10. Wireless transmitter; 11. Electric flap panel; 12. Smart sprayer. DETAILED DESCRIPTION

[0053] See also Figure 1-Figure 7As shown; the present invention provides a temperature-responsive fan control system for improving the energy efficiency of a cooling tower, which is used to adjust the operating speed of a cooling tower fan according to cooling requirements. The temperature-responsive fan control system includes a cooling tower and a water collection tank 3, a cooling tower water inlet 6, an automatic water replenishment tank 5, and a cooling tower water outlet 7 inside the cooling tower; it also includes: a temperature sensor 4, the temperature sensor 4 is arranged on the water collection tank 3, the cooling tower water inlet 6, the automatic water replenishment tank 5, and the cooling tower water outlet 7, the temperature sensor 4 is used to monitor the outlet water temperature, the water collection tank temperature or the inlet water temperature of the cooling tower in real time; a variable speed fan 2, the variable speed fan 2 is arranged on the cooling tower, and one end of the variable speed fan 2 is also connected to a motor 1 for driving; a frequency converter, the frequency converter is electrically connected to the variable speed fan 2, the frequency converter is used to adjust the operating frequency of the fan according to the water temperature after the operating frequency of the variable speed fan 2 is started; a controller 8, the controller is arranged in the cooling tower, the controller 8 is used to receive the data monitored by the temperature sensor 4, calculate the optimal operating speed of the variable speed fan 2, and issue control instructions to the frequency converter and the electric flap panel 11, and the intelligent sprayer 12. The controller can adjust the speed of the fan in real time, automatically control the opening and closing state of the electric flap and the start and stop of the intelligent sprayer, so as to maintain the optimal operating state of the system under different working conditions. When the temperature sensor detects that the water temperature is too high, the controller will automatically open the electric flap 11 to increase air circulation, and start the intelligent sprayer 12 to enhance the heat dissipation effect by spraying water vapor; when the temperature is lower than the set value, the controller will turn off the intelligent sprayer and the electric flap, thereby saving water resources and reducing energy consumption.

[0054] It should be noted that a cooling tower is a device that uses water as a circulating coolant to absorb heat from the system and discharge it into the atmosphere to reduce the water temperature. It is generally used in the refrigeration and heat dissipation of data center computer rooms. The cooling is to use water and air flow to exchange heat and generate steam. The steam evaporates and takes away the heat to achieve evaporative heat dissipation, convection heat transfer and radiation heat transfer. The evaporative heat dissipation device is used to dissipate the waste heat generated in industry or refrigeration and air conditioning to reduce the water temperature to ensure the normal operation of the system. The device is generally barrel-shaped, so it is called a cooling tower. A cooling tower generally has at least two fans, and the number of fans can be increased or decreased according to the actual cooling needs. In addition, a heater and a cooling plate are also provided in the cooling tower. When the real-time temperature monitored by the temperature sensor 4 is sent to the STM32 controller 8, the PID algorithm controls the PWM wave to be output from the controller to the variable speed fan 2. The target temperature set by the user and the temperature measured by the temperature sensor 4 in the environment can be compared to calculate the temperature difference and the adjustment amount. The duty cycle of the PWM wave is controlled according to the adjustment amount to control the work of the heater and the cooling plate, thereby completing the task of controlling the temperature.

[0055] In this embodiment, the temperature sensor 4 can be used to monitor the outlet water temperature, the water collection tank temperature or the inlet water temperature of the cooling tower in real time. The present invention selects the DS18B20 digital temperature sensor 4, which outputs a digital signal, has the characteristics of small size, low hardware cost, strong anti-interference ability and high precision (its measurement range is from -55℃-165℃, the accuracy can reach ±0.5℃, and the working voltage is 3V-5.5V). The temperature sensors distributed in the space can accurately reflect the working status and cooling requirements of the cooling tower, and then transmit the real-time ambient temperature to the controller, and then transmit it to the display screen for display, and at the same time remotely transmit the real-time data to the central control cabinet, and the staff will adjust the fan speed according to the temperature. This type of temperature sensor is very suitable for measuring the indoor air temperature distribution network, and is suitable for the use of this system to achieve energy saving and maximize the cooling effect.

[0056] In this embodiment, a wireless transmitter 10 is also included, which is used to quickly send the real-time temperature monitored by the temperature sensor to the controller 8, so as to adjust the speed of the variable speed fan 2 in real time; the wireless transmitter 10 uses the new single-chip RF transceiver nRF24L01, which can be connected to various single-chip microcomputer chips to complete the wireless transmission work. It works in the 2.4-2.5GHz ISM frequency band. It has built-in functional modules such as frequency synthesizer, power amplifier, crystal oscillator, modulator, and integrates enhanced Shock-Burst technology, in which the output power and communication channel can be configured through the program. The nRF24L01 has extremely low power consumption. When transmitting at a power of -6dB, the working current is only 9mA; when receiving, the working current is only 12.3mA, with multiple low-power working modes, the current is 160mA when working at 100mw, and the data transmission distance is farther than Wi-Fi. The system of the present invention can quickly send the real-time temperature monitored by the temperature sensor 4 to the controller through nRF24L01, so as to achieve the purpose of real-time regulation.

[0057] In this embodiment, according to the instructions of the controller 8, the speed of the variable speed fan 2 can be adjusted within a wide range to meet different cooling requirements. In this embodiment, it is planned to use a high-efficiency permanent magnet low-speed direct drive motor and a variable speed fan, and add a frequency converter central control cabinet 9 in the power room, so that the central control can automatically control the start and stop and adjust the speed. This measure reduces the reducer and transmission shaft, adopts frequency converter control, and designs a speed range of 0-200r / min, which can meet the speed and torque requirements of the load, so that the loss is reduced.

[0058] In this embodiment, the controller 8 can calculate the optimal fan operating speed according to the data received from the temperature sensor 4. In the process, the PID algorithm is set to process the temperature data monitored by the temperature sensor 4 and decide how to adjust the fan speed to achieve the optimal energy efficiency ratio. The design can control the start and stop of the cooling fan, the opening and closing state of the electric flap 11, and the spray volume of the intelligent sprayer 12 to achieve the purpose of rapid cooling and reducing energy loss.

[0059] In this embodiment, the STM32F407ZGT6 chip with Cortex-M4 as the core is used as the controller 8, wherein the FSMC interface is a new memory expansion technology adopted by the STM32 series, which can meet different types of static storage expansion. The RTC of STM32 can automatically compensate for the number of days in the month and daylight saving time, which provides great convenience for the display of time.

[0060] At the same time, this embodiment adopts PID algorithm in the design to control PWM wave output. The PID algorithm consists of three parts: proportional (P), integral (I) and differential (D). Proportional control takes into account the current error, and the error value is multiplied by a positive constant Kp (representing the proportion). Integral control takes into account past errors, and multiplies the error value over a period of time (error sum) by a positive constant Ki. Differential control takes into account future errors, calculates the first-order derivative of the error, and multiplies it by a positive constant Kd; where u(t) represents the output value of the controller; e(t) represents the error between the controller input and the set value; for details, please refer to Figure 6 , Figure 6 This is a PID algorithm flow chart. The target temperature set by the user and the temperature measured by the temperature sensor in the environment can be compared to calculate the temperature difference. The temperature difference is calculated through integration, differentiation and proportional operations to calculate the adjustment amount. The duty cycle of the PWM wave is controlled according to the adjustment amount to control the operation of the heater and the cooling plate, thereby completing the task of controlling the temperature. The temperature control process is shown in Figure 5 , the specific implementation flow chart of temperature control and speed regulation is shown in Figure 7 , using a loop structure, the temperature measured by the temperature sensor is continuously judged and selected to output PWM waves with different duty cycles, where the priority of threshold 1 is higher than the priority of threshold 2, which is higher than the priority of threshold 3, and the numerical value satisfies: 1>2>3.

[0061] It should be noted that the key factor of the present invention is temperature, and the variable to be controlled is the temperature of the cooling water system; the present invention measures the temperature of the water pool and the inlet and outlet of the cooling tower by installing a temperature sensor 4, and transmits the real-time temperature data of the measured place to the control terminal of the STM32 controller, writes an algorithm language to control the contactor to adjust the start and stop of the cooling fan, the opening and closing state of the intelligent flap, and the spray volume of the intelligent sprayer, and automatically or manually adjusts the speed of the fan according to the temperature of the cooling water to achieve the purpose of automatic temperature regulation; specifically, refer to the main program flow chart, such as Figure 4 shown.

[0062] At the same time, in order to facilitate operation, a central control cabinet 9 is also connected to the cooling tower, and a display screen 91 and a multi-function control button 92 are provided on the central control cabinet 9; wherein the display screen 91 and the multi-function control button 92 are electrically connected to the controller 8; the central control cabinet 9 can finally realize the following functions in the temperature responsive fan control system based on the STM32 single chip microcomputer:

[0063] The display screen 91 can be used to control and display in real time the temperature, the speed of the variable speed fan, the status of the electric flap, the status of the intelligent sprayer, the time, the date and the required information; the display screen adopts an LCD touch screen;

[0064] The multi-function control button 92 includes key0, key1, key2, key3, key4 and key5;

[0065] Button key0 is used to set the preset water temperature and preset time;

[0066] Button key1 controls the variable speed fan to rotate at low speed;

[0067] Button key2 controls the variable speed fan to rotate at high speed;

[0068] Pressing key3 makes the variable speed fan work in temperature control state: when the temperature exceeds the set threshold 1, the variable speed fan automatically rotates at high speed; when the temperature exceeds the set threshold 2, the variable speed fan automatically moves at low speed; when the temperature is lower than the set threshold 3, the variable speed fan automatically stops rotating;

[0069] Key 4 controls the opening and closing state of the electric flap: according to the cooling demand, when the variable speed fan runs at high speed or the temperature is high, the electric flap automatically opens; when the variable speed fan runs at low speed or the temperature is low, the electric flap automatically closes;

[0070] The key 5 button controls the intelligent sprayer: according to the monitored water temperature, when the water temperature exceeds the set value, the intelligent sprayer automatically starts and performs additional cooling through vaporized water mist; when the temperature drops below the set value, the intelligent sprayer automatically shuts down to save water resources. This system can dynamically change the fan speed, the opening and closing state of the electric flap, and the spray volume of the intelligent sprayer according to the ambient temperature and cooling demand to achieve rapid cooling and reduce energy loss. Through these intelligent control measures, the system can ensure that the circulating water in the cooling tower maintains a suitable temperature under various working conditions, and has significant energy-saving and environmental protection advantages. From the perspective of living needs and socio-economics, this system has strong development potential.

[0071] It should be noted that the temperature-responsive fan control system of the present invention is based on an STM32 controller, uses a temperature sensor to monitor temperature readings in real time, and dynamically adjusts fan speed, flap opening and closing status, and spray volume of the sprayer, which not only improves the energy efficiency and performance of the cooling tower, but also reduces operating costs and maintenance requirements. The system significantly reduces the impact on the environment by reducing unnecessary energy consumption and water waste, providing a sustainable and efficient industrial cooling solution.

[0072] The working principle of the invention is based on intelligent control and temperature feedback mechanism, which optimizes the operation of fans, flaps and sprayers in the cooling tower to improve the overall energy efficiency and cooling performance. The following is a detailed description of the working principle:

[0073] First, the temperature inside the cooling tower is monitored. The temperature sensor in the system is one of the key components. These temperature sensors are installed in key locations of the cooling tower, such as the water outlet, water inlet and water pool, to monitor the temperature of the cooling water in real time. These temperature data can directly reflect the current working status and cooling needs of the cooling tower. At the same time, the monitored temperature data will be transmitted to the STM32 controller in real time; these data are an important basis for the decision-making process of the control system.

[0074] The present invention has an advanced algorithm built into the controller for processing the received temperature data; based on this data, the algorithm will calculate the current optimal fan operating speed, and intelligently adjust the opening and closing state of the electric flap and the working time of the intelligent sprayer according to the cooling demand. The algorithm design not only takes into account the real-time temperature, but also performs intelligent optimization based on factors such as preset working parameters, historical data and environmental changes. By setting corresponding thresholds, the system can respond to different workloads. When the monitored temperature or fan operating status exceeds the set threshold, the system will trigger an alarm and display relevant information on the touch screen. If the system is connected to an audio device, an alarm will sound to alert the on-site staff. If this system is connected to the company's kinetic energy operation and maintenance platform through the Internet, when an alarm event occurs, the system will send the alarm information to the mobile phone of the relevant personnel.

[0075] In addition, according to the instructions of the controller, the speed of the fan, the opening and closing status of the flap, and the spray volume of the sprayer will be adjusted accordingly. If the temperature sensor detects that the outlet water temperature is high, indicating that more cooling is needed, the system will increase the fan speed and open the electric flap to enhance air circulation, and start the sprayer to enhance the heat dissipation effect; on the contrary, if the cooling demand decreases, the system will reduce the fan speed, close the flap and stop the sprayer, thereby saving energy and water resources. The system ensures that the cooling tower always maintains the best energy efficiency and cooling performance under various operating conditions by continuously monitoring temperature data and load status. In this way, the system can quickly respond to environmental changes and different workload conditions.

[0076] In summary, the present invention utilizes temperature data, intelligent control algorithms, and dynamically adjusts the functions of fans, flaps, and sprayers to adapt to changing cooling needs. This intelligent and adaptive working mechanism not only significantly improves energy efficiency, but also ensures the optimal cooling effect of the system under different conditions, and improves the overall performance and economic benefits of the cooling tower.

[0077] The above-mentioned related explanations and descriptions of the embodiments are for the convenience of those skilled in the art to understand and apply the present invention. It is obvious that those familiar with the art can easily make various modifications to these contents and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above-mentioned related explanations and descriptions of the embodiments. Improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the protection scope of the present invention.

Claims

1. A temperature-responsive fan control system for improving the energy efficiency of a cooling tower, comprising a cooling tower and a water collection tank inside the cooling tower, a cooling tower water inlet, an automatic water replenishment tank, and a cooling tower water outlet; characterized in that: Also includes: A temperature sensor is provided on the water collecting tank, the water inlet of the cooling tower, the automatic water replenishment tank, and the water outlet of the cooling tower. The temperature sensor is used to monitor the outlet water temperature of the cooling tower, the water collecting tank temperature, or the inlet water temperature in real time; A variable speed fan, wherein the variable speed fan is arranged on the cooling tower and one end of the variable speed fan is connected to a motor for driving; A frequency converter, the frequency converter being connected to the variable speed fan, and the frequency converter being used to adjust the operating frequency of the variable speed fan according to the water temperature after the operating frequency of the variable speed fan is started; A controller, the controller is arranged in the cooling tower, the controller is used to receive the data monitored by the temperature sensor, calculate the optimal operating speed of the variable speed fan, and issue a control instruction to the frequency converter; An electric flap panel is installed at the vent of the cooling tower, the flap panel is connected to the controller, and the controller automatically adjusts the opening and closing of the electric flap panel according to the temperature data monitored in real time by the temperature sensor; Smart sprayer: The smart sprayer is installed inside the cooling tower, and the start and shut down of the smart sprayer are automatically adjusted by the controller.

2. The temperature-responsive fan control system for improving the energy efficiency of a cooling tower according to claim 1, characterized in that: The controller is provided with a PID algorithm, and the PID algorithm is used to process the temperature data monitored by the received temperature sensor; preferably, the temperature sensor is a DS18B20 digital temperature sensor.

3. The temperature-responsive fan control system for improving the energy efficiency of a cooling tower according to claim 2, characterized in that: The PID algorithm compares the target temperature set by the user with the temperature of the environment measured by the temperature sensor, calculates the temperature difference, and calculates the adjustment amount through integration, differentiation and proportional operations on this temperature difference, and controls the duty cycle of the PWM wave according to this adjustment amount.

4. The temperature-responsive fan control system for improving the energy efficiency of a cooling tower according to claim 1, characterized in that: It also includes a wireless transmitter, which is used to quickly send the real-time temperature monitored by the temperature sensor to the controller to adjust the speed of the variable-speed fan in real time.

5. The temperature-responsive fan control system for improving the energy efficiency of a cooling tower according to claim 1, characterized in that: When the water temperature in the cooling tower is higher than the preset water temperature, the frequency converter increases the operating frequency of the variable speed fan; when the water temperature in the cooling tower is lower than the preset water temperature, the frequency converter reduces the operating frequency of the variable speed fan.

6. The temperature-responsive fan control system for improving the energy efficiency of a cooling tower according to claim 1, characterized in that: The controller uses the STM32F407ZGT6 chip with Cortex-M4 as the core.

7. The temperature-responsive fan control system for improving the energy efficiency of a cooling tower according to claim 1, characterized in that: The wireless transmitter uses the new single-chip radio frequency transceiver nRF24L01.

8. The temperature-responsive fan control system for improving the energy efficiency of a cooling tower according to claim 1, characterized in that: The motor is a high-efficiency permanent magnet low-speed direct drive motor.

9. The temperature-responsive fan control system for improving the energy efficiency of a cooling tower according to claim 1, characterized in that: The controller adjusts the working states of the electric flap and the intelligent sprayer by introducing a PID algorithm to achieve intelligent control of the cooling tower and ensure optimal energy efficiency under various operating conditions.

10. The temperature-responsive fan control system for improving the energy efficiency of a cooling tower according to claim 1, characterized in that: It also includes a central control cabinet, which is arranged on the cooling tower; Wherein, the central control cabinet is provided with a display screen and a multi-function control button; the display screen and the multi-function control button are electrically connected to the controller; The display screen adopts an LCD touch screen for controlling and displaying temperature, fan speed, time, date and required information in real time; The multifunctional control button includes key0, key1, key2, key3, key4 and key5; Among them, key0 is used to set the preset water temperature and preset time; Button key1 controls the variable speed fan to rotate at low speed; Button key2 controls the variable speed fan to rotate at high speed; Pressing key3 makes the variable speed fan work in temperature control state: when the temperature exceeds the set threshold 1, the variable speed fan automatically rotates at high speed; when the temperature exceeds the set threshold 2, the variable speed fan automatically moves at low speed; when the temperature is lower than the set threshold 3, the variable speed fan automatically stops rotating; Key 4 controls the opening and closing state of the electric flap: according to the cooling demand, when the variable speed fan runs at high speed or the temperature is high, the electric flap automatically opens; when the variable speed fan runs at low speed or the temperature is low, the electric flap automatically closes; Press key5 to control the smart sprayer: based on the monitored water temperature, when the water temperature exceeds the set value, the smart sprayer automatically starts and performs additional cooling through vaporized water mist; when the temperature drops below the set value, the smart sprayer automatically shuts down to save water resources.

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