Cooling tower energy-saving control method, system, electronic device and storage medium

Abstract

The application provides a cooling tower energy-saving control method and system, an electronic device and a storage medium. The method comprises the following steps: obtaining the outlet water temperature and the target temperature of the cooling tower; and controlling the operating state of the fan of the cooling tower according to the difference between the outlet water temperature and the target temperature, wherein the operating state comprises at least one of the following: starting, frequency conversion and stopping. The application adjusts the outlet water temperature of the cooling tower based on the target temperature. In the case that the cooling tower of the application is used to provide cooling water for a cooling device, the cooling demand is met while avoiding excessively low outlet water temperature of the cooling tower, which is beneficial to the heat evaporation of the cooling tower, thereby reducing energy consumption, improving energy efficiency, being conducive to energy saving and environmental protection, and meeting the concept of carbon neutralization and carbon peak.

Description

Technical Field

[0001] This application relates to the field of cooling tower technology, and in particular to a cooling tower energy-saving control method, system, electronic device and storage medium. Background Technology

[0002] Cooling towers, as energy conversion devices, are widely used in industrial production and daily life to provide cooling water to cooling equipment. Cooling towers typically utilize the contact between water and air, dissipating heat through evaporation from the warm water added to the tower and from the hot water generated by the cooling equipment and flowing back into the tower. This is achieved through latent heat exchange, lowering the water temperature. When the air in contact with the water vapor is saturated, water molecules cannot evaporate further, reaching a dynamic equilibrium. At this point, the number of water molecules that evaporate equals the number of water molecules returning from the air to the water, and the water temperature remains constant. Ideally, the lowest outlet water temperature of a cooling tower equals the wet-bulb temperature of the outdoor air. Therefore, wet-bulb temperature is a crucial factor in controlling the outlet water temperature of a cooling tower. However, currently, there is a lack of methods to control the outlet water temperature of cooling towers based on ambient wet-bulb temperature, which is detrimental to heat evaporation and can easily lead to energy waste. Summary of the Invention

[0003] In view of this, it is necessary to provide a cooling tower energy-saving control method, system, electronic equipment and storage medium to solve the above-mentioned technical problem that the lack of means to control the cooling tower outlet water temperature by the ambient wet-bulb temperature is not conducive to the heat evaporation of the cooling tower and leads to energy waste.

[0004] This application provides a cooling tower energy-saving control method, the method comprising:

[0005] Obtain the outlet water temperature and target temperature of the cooling tower;

[0006] The operating status of the cooling tower fan is controlled based on the difference between the outlet water temperature and the target temperature, and the operating status includes at least one of on, frequency conversion and off.

[0007] The cooling tower includes at least three water towers. If the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to a preset value, the fans of the at least three water towers are controlled to shut down. If the difference between the outlet water temperature and the target temperature is greater than 0 and its absolute value is greater than the preset value, the operation of the fans of the at least three water towers is controlled in a first order until the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to the preset value. If the difference between the outlet water temperature and the target temperature is less than or becomes less than 0 and its absolute value is greater than the preset value, the operation of the fans of the at least three water towers is controlled in a second order, opposite to the first order, until the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to the preset value.

[0008] Optionally, the method further includes obtaining the ambient wet-bulb temperature of the cooling tower and calculating the sum of the ambient wet-bulb temperature and a preset temperature. If the sum of the ambient wet-bulb temperature and the preset temperature is within the design outlet water temperature range of the cooling tower, then the target temperature is the sum of the ambient wet-bulb temperature and the preset temperature. If the sum of the ambient wet-bulb temperature and the preset temperature is lower than the lower limit of the design outlet water temperature range, then the target temperature is the lower limit of the design outlet water temperature range. Alternatively, if the sum of the ambient wet-bulb temperature and the preset temperature is higher than the upper limit of the design outlet water temperature range, then the target temperature is the upper limit of the design outlet water temperature range.

[0009] Optionally, obtaining the outlet water temperature of the cooling tower includes: detecting the outlet water temperature of the cooling tower using a temperature transmitter installed on the water supply pipe of the cooling tower;

[0010] The process of obtaining the ambient wet-bulb temperature of the cooling tower includes: detecting the ambient wet-bulb temperature using a wet-bulb temperature transmitter installed in the field environment of the cooling tower.

[0011] Optionally, the method further includes:

[0012] According to the first order, the target temperature of the subsequent water tower is set to be greater than the target temperature of the preceding water tower. The cooling tower is connected to the cooling equipment through a water supply pipe. The first order is the order from closest to furthest from the cooling equipment, and the preceding water tower is closer to the cooling equipment than the subsequent water tower.

[0013] Optionally, controlling the operating state of the cooling tower fan based on the difference between the outlet water temperature and the target temperature includes:

[0014] If the at least three water towers have the same structure and the fans of the at least three water towers are all fixed frequency, if the difference between the outlet water temperature and the target temperature is greater than 0 and the absolute value is greater than the preset value, the fans of the at least three water towers shall be turned on in the first order until the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to the preset value.

[0015] If the difference between the outlet water temperature and the target temperature is less than or becomes less than 0 and its absolute value is greater than the preset value, the fans of the at least three water towers shall be shut down in a second order, opposite to the first order, until the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to the preset value.

[0016] Optionally, the cooling tower is connected to the cooling equipment via a water supply pipe, and the at least three water towers include a first water tower and a second water tower arranged in sequence, with the first water tower being closer to the cooling equipment;

[0017] The step of activating the fans of the at least three water towers in the first order until the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to the preset value includes:

[0018] First, start the fixed-frequency fan of the first water tower. If, after starting all the fixed-frequency fans of the first water tower, the difference between the outlet water temperature and the target temperature is still greater than 0 and the absolute value of the difference is still greater than the preset value, then start the fixed-frequency fan of the second water tower until the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to the preset value; or

[0019] The step of shutting down the fans of the at least three water towers in a second order, opposite to the first order, until the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to the preset value includes:

[0020] First, shut down the fixed-frequency fan of the second water tower. If, after shutting down all the fixed-frequency fans of the second water tower, the difference between the outlet water temperature and the target temperature is still less than 0 and the absolute value of the difference is still greater than the preset value, then shut down the fixed-frequency fan of the first water tower until the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to the preset value.

[0021] Optionally, controlling the operating state of the cooling tower fan based on the difference between the outlet water temperature and the target temperature includes:

[0022] If the at least three water towers have the same structure and the fans of the at least three water towers are a combination of fixed frequency and variable frequency, if the difference between the outlet water temperature and the target temperature is greater than 0 and the absolute value is greater than the preset value, the variable frequency fan is turned on, and the frequency of the variable frequency fan changes according to the difference between the outlet water temperature and the target temperature.

[0023] If the variable frequency fan reaches the frequency limit, the fixed frequency fan is turned on. The frequency of the variable frequency fan is changed in coordination with the fixed frequency fan according to the difference between the outlet water temperature and the target temperature, until the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to the preset value.

[0024] If the difference between the outlet water temperature and the target temperature is less than or becomes less than 0 and its absolute value is greater than the preset value, the fixed-frequency fan that is turned on is turned off, and the frequency of the variable-frequency fan is adjusted until the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to the preset value.

[0025] Optionally, the cooling tower is connected to the cooling equipment via a water supply pipe, and the at least three water towers include a first water tower and a second water tower arranged in sequence, with the first water tower being closer to the cooling equipment;

[0026] The steps of activating the variable frequency fan if the difference between the outlet water temperature and the target temperature is greater than 0 and its absolute value is greater than the preset value, and activating the fixed frequency fan if the variable frequency fan reaches its frequency limit, include:

[0027] The variable frequency fan of the first water tower is activated first. If the difference between the outlet water temperature and the target temperature is still greater than 0 and the absolute value of the difference is still greater than the preset value, the frequency of the variable frequency fan of the first water tower is increased until the frequency limit is reached. If the variable frequency fan reaches the frequency limit, the fixed frequency fan of the first water tower is activated first. The frequency of the variable frequency fan of the first water tower is changed in coordination with the fixed frequency fan of the first water tower according to the difference between the outlet water temperature and the target temperature, until the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to the preset value. If the outlet water temperature cannot be adjusted to the target temperature even after both the variable frequency fan and the fixed frequency fan of the first water tower are activated, the frequency of the variable frequency fan of the first water tower is activated first. When the absolute value of the difference between the target and outlet temperatures is less than or equal to the preset value, the variable frequency fan of the second water tower is turned on. The frequency of the variable frequency fan of the second water tower varies according to the difference between the outlet water temperature and the target temperature. If the variable frequency fan of the second water tower reaches its frequency limit, and the difference between the outlet water temperature and the target temperature is still greater than 0 and the absolute value of the difference is still greater than the preset value, the fixed frequency fan of the second water tower is turned on. The frequency of the variable frequency fan of the second water tower is changed in coordination with the fixed frequency fan of the second water tower according to the difference between the outlet water temperature and the target temperature, until the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to the preset value; or

[0028] If the difference between the outlet water temperature and the target temperature is less than or becomes less than 0 and its absolute value is greater than the preset value, the fixed-frequency fan is turned off, and the frequency of the variable-frequency fan is adjusted until the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to the preset value, including:

[0029] The fixed-frequency fan of the second water tower is shut down first, and the frequency of the variable-frequency fan of the second water tower is gradually increased or decreased. Simultaneously, it is determined whether the absolute value of the difference between the outlet water temperature and the target temperature becomes less than or equal to the preset value. If the absolute value of the difference between the outlet water temperature and the target temperature becomes less than or equal to the preset value, the increase or decrease of the frequency of the variable-frequency fan of the second water tower is stopped. If, after shutting down both the fixed-frequency and variable-frequency fans of the second water tower, the absolute value of the difference between the outlet water temperature and the target temperature still cannot become less than or equal to the preset value, the fixed-frequency fan of the first water tower is shut down first, and the frequency of the variable-frequency fan of the first water tower is gradually increased or decreased. Simultaneously, it is determined whether the absolute value of the difference between the outlet water temperature and the target temperature becomes less than or equal to the preset value. If the absolute value of the difference between the outlet water temperature and the target temperature becomes less than or equal to the preset value, the increase or decrease of the frequency of the variable-frequency fan of the first water tower is stopped until the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to the preset value.

[0030] Optionally, the power consumption of the fixed-frequency fan is the product of its rated power and time, while the power consumption of the variable-frequency fan is (X / f) max ) 3 The product of rated power and time, where X is the current frequency of the variable frequency fan, and f is the frequency of the variable frequency fan. max The maximum frequency of the variable frequency fan is given, and the total power consumption of the cooling tower is the sum of the power consumption of all fixed frequency fans and variable frequency fans.

[0031] Optionally, the method further includes:

[0032] The total power consumption of the cooling tower is obtained through multiple power lines connected to the cooling tower.

[0033] Optionally, controlling the operating state of the cooling tower fan based on the difference between the outlet water temperature and the target temperature includes:

[0034] If the difference between the outlet water temperature and the target temperature is greater than 0 and its absolute value is greater than the preset value, control the number of fixed-frequency and variable-frequency fans that are turned on, and control the frequency of the variable-frequency fans, until the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to the preset value, thereby minimizing the total power consumption of the cooling tower; and

[0035] If the difference between the outlet water temperature and the target temperature is less than or becomes less than 0 and its absolute value is greater than the preset value, the number of fixed-frequency fans and variable-frequency fans turned on is controlled, and the frequency of the variable-frequency fans is controlled, until the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to the preset value, and the total power consumption of the cooling tower is minimized.

[0036] This application also provides a cooling tower energy-saving control system, the system comprising:

[0037] Cooling towers, comprising at least three water towers, each equipped with at least one fan;

[0038] A temperature acquisition unit is used to acquire the outlet water temperature and target temperature of the cooling tower;

[0039] An adjustment and control unit is used to control the operating status of the cooling tower fan based on the difference between the outlet water temperature and the target temperature, wherein the operating status includes at least one of on, frequency conversion, and off.

[0040] Specifically, if the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to a preset value, the regulating control unit controls the fans of the at least three water towers to shut down; if the difference between the outlet water temperature and the target temperature is greater than 0 and its absolute value is greater than the preset value, the regulating control unit controls the operation of the fans of the at least three water towers in a first sequence until the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to the preset value; if the difference between the outlet water temperature and the target temperature is less than or becomes less than 0 and its absolute value is greater than the preset value, the regulating control unit controls the operation of the fans of the at least three water towers in a second sequence opposite to the first sequence until the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to the preset value.

[0041] Optionally, the temperature acquisition unit is further configured to:

[0042] According to the first order, the target temperature of the subsequent water tower is set to be greater than the target temperature of the preceding water tower. The cooling tower is connected to the cooling equipment through a water supply pipe. The first order is the order from closest to furthest from the cooling equipment, and the preceding water tower is closer to the cooling equipment than the subsequent water tower.

[0043] This application also provides an electronic device, the electronic device comprising:

[0044] Processor; and

[0045] The memory stores multiple program modules, which are loaded and executed by the processor using the aforementioned cooling tower energy-saving control method.

[0046] This application also provides a computer-readable storage medium having stored thereon at least one computer instruction, which is loaded by a processor and executed by the above-described cooling tower energy-saving control method.

[0047] The cooling tower energy-saving control method, system, electronic equipment and storage medium provided in this application can adjust the cooling tower outlet water temperature based on the target temperature. When using the cooling tower of this application to provide cooling water for cooling equipment, while meeting the cooling requirements, the cooling tower outlet water temperature is avoided to prevent it from being too low. This is conducive to the evaporation of heat from the cooling tower, thereby reducing energy consumption and improving energy efficiency. It is beneficial to energy conservation and environmental protection and is in line with the concepts of carbon neutrality and carbon peaking. Attached Figure Description

[0048] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0049] Figure 1 This is a schematic diagram of the application environment of the cooling tower provided in the preferred embodiment of this application.

[0050] Figure 2 This is a schematic diagram of the structure of a cooling tower provided in one embodiment of this application.

[0051] Figure 3 This is a schematic diagram of the structure of the cooling tower energy-saving control system provided in a preferred embodiment of this application.

[0052] Figure 4 This is a schematic diagram of the structure of a cooling tower provided in another embodiment of this application.

[0053] Figure 5 This is a schematic diagram of the structure of a cooling tower provided in another embodiment of this application.

[0054] Figure 6 This is a flowchart of a cooling tower energy-saving control method provided in a preferred embodiment of this application.

[0055] Figure 7 This is a flowchart of an embodiment of the present application, which shows how the operating status of the cooling tower fan is controlled based on the difference between the outlet water temperature and the target temperature.

[0056] Figure 8This is a flowchart of another embodiment of the present application, which shows how to control the operating status of the cooling tower fan based on the difference between the outlet water temperature and the target temperature.

[0057] Figure 9 This is a flowchart of another embodiment of the present application, which shows how to control the operating status of the cooling tower fan based on the difference between the outlet water temperature and the target temperature.

[0058] Figure 10 This is a schematic diagram of the structure of an electronic device provided in a preferred embodiment of this application.

[0059] Explanation of main component symbols

[0060]

[0061] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this application. Detailed Implementation

[0062] To better understand the above-mentioned objectives, features, and advantages of this application, the application will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0063] Numerous specific details are set forth in the following description to provide a thorough understanding of this application. The described embodiments are merely some, not all, of the embodiments described herein. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0064] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0065] Please see Figure 1The diagram shown illustrates the application environment of a cooling tower according to a preferred embodiment of this application. The cooling tower 10 includes, but is not limited to, two water towers 11, a supply pipe 12, a return pipe 13, water pumps 141 and 142, a wet-bulb temperature transmitter 15, and a temperature transmitter 16. Each water tower 11 is equipped with at least one fan 110, which will be described in detail below with reference to the accompanying drawings. Water pump 141 is located on the supply pipe 12, water pump 142 is located on the return pipe 13, wet-bulb temperature transmitter 15 is located on the water tower 11, and temperature transmitter 16 is located on the supply pipe 12, for example, on the side of the supply pipe 12 closer to the water tower 11 than water pump 141, to accurately measure and transmit the outlet water temperature of the water tower 11. This is because the water supplied from the water tower 11 is affected by factors such as ambient temperature and losses during its journey away from the water tower 11, resulting in a certain difference compared to the initial outlet water temperature of the water supplied from the water tower 11. Water supply pipe 12 is connected to cooling device 2 via water pump 141, and cooling device 2 is then connected to water tower 11 via return water pipe 13. Water supply pipe 12 supplies cooling water output from water tower 11 to cooling device 2 via water pump 141. The cooling water output from water tower 11 is at a lower temperature than the chilled water in cooling device 2, and can absorb heat from the chilled water. After absorbing the heat from the chilled water in cooling device 2, the cooled water, now heated, is returned to water tower 11 by water pump 142 for further cooling, and then returned to cooling device 2 for reuse. Optionally, cooling device 2 can be an ice machine, etc.

[0066] Please see Figure 2 The diagram shown is a structural schematic of a cooling tower according to an embodiment of this application. The cooling tower 10 includes at least three water towers 11, which are arranged, for example, in series. It should be noted that, for ease of illustration, [the diagram is incomplete]. Figure 2 Only two water towers 11 are shown in the diagram. Furthermore, "in series" here is understood to mean that the water supplied by at least three water towers 11 is collected in the same water supply pipe 12. Cooling tower 10 is connected to a cooling device 2 to supply cooling water to the cooling device 2. Fan 110 cools the water in water tower 11, and water pump 141 transports the cooled water to cooling device 2. The cooling water absorbs heat from the chilled water in cooling device 2, and then water pump 142 of cooling device 2 returns the heated cooling water to water tower 11 for further cooling, forming a cycle. Wet-bulb temperature transmitter 15 is installed in the environment surrounding cooling tower 10 to sense the ambient wet-bulb temperature of cooling tower 10. The wet-bulb temperature is the lowest temperature that can be reached in the current environment solely through the evaporation of water. Temperature transmitter 16 is installed on the water supply pipe 12 of cooling tower 10 to sense the outlet water temperature of cooling tower 10.

[0067] Please see Figure 3The diagram shown is a structural schematic of a cooling tower energy-saving control system provided in a preferred embodiment of this application. The cooling tower energy-saving control system 1 includes, but is not limited to, a cooling tower 10, a temperature acquisition unit 20, and a regulation and control unit 30.

[0068] The temperature acquisition unit 20 is used to acquire the outlet water temperature of the cooling tower 10 sensed by the temperature transmitter 16 and the ambient wet-bulb temperature sensed by the wet-bulb temperature transmitter 15, and can determine the target temperature by the sum of the ambient wet-bulb temperature and the preset temperature.

[0069] The temperature acquisition unit 20 can be an arithmetic logic unit (ALU) capable of performing various arithmetic operations. This ALU includes at least an arithmetic logic unit with basic functions such as addition, subtraction, multiplication, and division. The ALU performs arithmetic operations on the temperature values ​​measured and transmitted by the temperature transmitter 16 and the wet-bulb temperature transmitter 15 through the arithmetic logic unit. The temperature acquisition unit 20 can also be other devices capable of performing or having this arithmetic operation function.

[0070] The target temperature is within the design outlet water temperature range of cooling tower 10. Optionally, the design outlet water temperature range is 16-32℃, that is, greater than or equal to 16℃ and less than or equal to 32℃. If the target temperature is lower than the lower limit of the design outlet water temperature range, the target temperature is the lower limit of the design outlet water temperature range, for example, 16℃. If the target temperature is higher than the upper limit of the design outlet water temperature range, the target temperature is the upper limit of the design outlet water temperature range, for example, 32℃.

[0071] Optionally, the preset temperature is 3℃. The preset temperature is selected from a preset temperature range, which is a performance indicator of the water tower 11. Generally speaking, the preset temperature range of a water tower 11 is determined at the factory, and the conventional preset temperature range is ±5℃.

[0072] In some embodiments, when the cooling tower 10 includes at least three water towers 11, all water towers 11 are defined sequentially from closest to furthest from the cooling device 2 as the first water tower (i.e., the first water tower), the second water tower, ..., the last water tower. Since the outlet water temperature of the first water tower (e.g., the first water tower) requires a certain delay to stabilize after it is turned on, the target temperature of the subsequent water tower (e.g., the second water tower) is set to be higher than that of the first water tower. For example, the target temperature of the subsequent water tower is ambient wet-bulb temperature + 3.5°C, slightly higher than the target temperature of the first water tower (ambient wet-bulb temperature + 3°C). This avoids setting the target temperatures of the two water towers to be the same, which would cause frequent turning on and off of the water towers and thus cause oscillations in the cooling tower system. Avoiding oscillations in the cooling tower system can achieve energy-saving effects, because the energy consumption during oscillations is greater than that during normal operation or standby of the cooling tower system. Meanwhile, because the target temperature of the rear water tower is set relatively high, the requirements for the number or frequency of fans are lower, which can achieve further energy-saving effects.

[0073] The temperature acquisition unit 20 also sets a target temperature for each water tower 11. In one embodiment, the temperature acquisition unit 20 sets the target temperature of a later water tower 11 to be greater than the target temperature of an earlier water tower 11, according to a first order. The "first order" in this document refers to the order from the first water tower to the last water tower; for example, the first order is... Figure 2 The order shown from right to left, in other words, is the order of proximity to the cooling device 2, with the earlier water tower being closer to the cooling device 2 than the later water tower. The target temperature of the first water tower 11 is the ambient wet-bulb temperature +3℃, and the target temperature of the second water tower 11 is the ambient wet-bulb temperature +3.5℃.

[0074] In other embodiments, the temperature acquisition unit 20 may also set the target temperature for each water tower to be the same.

[0075] The control unit 30 is used to control the operating status of the fan 110 of the cooling tower 10 according to the difference between the outlet water temperature and the target temperature (i.e., the value obtained by subtracting the target temperature from the outlet water temperature).

[0076] In one embodiment, if the difference between the outlet water temperature and the target temperature is greater than 0 and its absolute value is greater than a preset value, the control unit 30 adjusts the operating state of at least three water tower 11 fans 110 in a first sequence as needed, until the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to the preset value. If the difference between the outlet water temperature and the target temperature is less than or becomes less than 0 and its absolute value is greater than the preset value, the control unit 30 adjusts the operating state of at least three water tower 11 fans 110 in a second sequence opposite to the first sequence as needed, until the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to the preset value. For example, the second sequence is... Figure 2 The water tower sequence is shown from left to right. The preset value is a permissible error for the target temperature or a numerical range set based on that permissible error. Here, "as needed" means controlling the operation of fan 110 with the absolute value of the difference between the outlet water temperature and the target temperature being less than or equal to the preset value as the control target. If this control target is not achieved, the action of controlling the operation of fan 110 is performed, i.e., there is a need for such control; if this control target is achieved, the action of controlling the operation of fan 110 is no longer performed, i.e., there is no need for such control. The same applies below.

[0077] In one embodiment, the operating state includes at least one of on, frequency conversion, and off.

[0078] If the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to a preset value, the regulating control unit 30 controls the fans 110 of at least three water towers 11 to shut down. The difference between the outlet water temperature and the target temperature is the difference between the outlet water temperature and the target temperature. Optionally, the preset value is 0.5℃.

[0079] It should be noted that if the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to the preset value, it means that the difference between the outlet water temperature and the target temperature is small, and the outlet water temperature meets the target temperature. Therefore, the regulating control unit 30 controls the fans 110 of at least three water towers 11 to shut down in order to save energy.

[0080] like Figure 2 As shown, in this embodiment, at least three water towers 11 have the same structure, and the fans 110 of all water towers 11 are of fixed frequency. All water towers 11 in the cooling tower 10 are connected in series. If the difference between the outlet water temperature and the target temperature is greater than 0 and the absolute value is greater than a preset value, the control unit 30 turns on the fans 110 of at least three water towers 11 in a first sequence as needed until the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to the preset value.

[0081] For example, in the case of such Figure 2In the case of two water towers 11 arranged in the order shown, the control unit 30 first turns on the fans 110 of the right water tower 11 one by one. After each fan 110 is turned on, it determines whether the absolute value of the difference between the outlet water temperature and the target temperature becomes less than or equal to a preset value. If the absolute value of the difference between the outlet water temperature and the target temperature becomes less than or equal to the preset value, the fan 110 is turned off. If all the fans 110 of the right water tower 11 are turned on and the absolute value of the difference between the outlet water temperature and the target temperature is still greater than the preset value, then the fans 110 of the left water tower 11 are turned on one by one until the absolute value of the difference between the outlet water temperature and the target temperature becomes less than or equal to the preset value.

[0082] It should be noted that if the difference between the outlet water temperature and the target temperature is greater than 0 and the absolute value is greater than the preset value, it means that the outlet water temperature is greater than the target temperature and the difference between the outlet water temperature and the target temperature is large, which cannot meet the cooling requirements of cooling device 2. Therefore, the water in the water tower is cooled by turning on the fixed frequency fan to reduce the outlet water temperature in order to meet the cooling requirements of cooling device 2.

[0083] If the difference between the outlet water temperature and the target temperature is less than or becomes less than 0 and the absolute value is greater than the preset value, the control unit 30 adjusts and shuts down at least three water tower 11 fans 110 as needed in a second order opposite to the first order, until the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to the preset value.

[0084] The control unit 30 first shuts down the fans 110 of the left water tower 11 one by one. After shutting down each fan 110, it checks whether the absolute value of the difference between the outlet water temperature and the target temperature becomes less than or equal to a preset value. If the absolute value of the difference between the outlet water temperature and the target temperature becomes less than or equal to the preset value, the shutdown of the fan 110 stops. If all the fans 110 of the left water tower 11 have been shut down and the absolute value of the difference between the outlet water temperature and the target temperature is still greater than the preset value, then the fans 110 of the right water tower 11 are shut down one by one until the absolute value of the difference between the outlet water temperature and the target temperature becomes less than or equal to the preset value.

[0085] It should be noted that if the difference between the outlet water temperature and the target temperature is less than 0 and the absolute value is greater than the preset value, it means that the outlet water temperature is lower than the target temperature and the difference between the outlet water temperature and the target temperature is large, and the outlet water temperature is too low. Therefore, the cooling effect on the water in the water tower is reduced by turning off the fixed frequency fan to save energy.

[0086] The control unit 30 can be a PLC controller, FPGA, microcomputer, or other controllers, as will be described below. Figure 10 Processor 301 is described.

[0087] Please see Figure 4The diagram shown is a structural schematic of a cooling tower according to another embodiment of this application. In this embodiment, all water towers 11 have the same structure, and the fan 110 of each water tower 11 is a combination of fixed frequency and variable frequency. At least three water towers 11 in the cooling tower 10 (for ease of illustration, [the diagram is missing]) are shown. Figure 4 The diagram only shows two water towers 11) connected in series. If the difference between the outlet water temperature and the target temperature is greater than 0 and the absolute value is greater than the preset value, the control unit 30 will turn on the variable frequency fan. The frequency of the variable frequency fan will change according to the difference between the outlet water temperature and the target temperature.

[0088] Specifically, if the difference between the outlet water temperature and the target temperature is greater than 0 and the absolute value is greater than the preset value, the control unit 30 turns on, for example, the variable frequency fan of the water tower 11 on the right, and gradually increases the frequency of the variable frequency fan. At the same time, it determines whether the absolute value of the difference between the outlet water temperature and the target temperature becomes less than or equal to the preset value. If the absolute value of the difference between the outlet water temperature and the target temperature becomes less than or equal to the preset value, the frequency of the variable frequency fan is stopped from being increased. If the absolute value of the difference between the outlet water temperature and the target temperature is still greater than the preset value, the frequency of the variable frequency fan continues to be increased until the frequency upper limit is reached.

[0089] If the variable frequency fan reaches its frequency limit, the control unit 30 will turn on the fixed frequency fan, for example, the one in the water tower 11 on the right. At this time, the frequency of the variable frequency fan will change in coordination with the fixed frequency fan according to the difference between the outlet water temperature and the target temperature, until the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to the preset value.

[0090] Specifically, if the variable frequency fan reaches its frequency limit and the absolute value of the difference between the outlet water temperature and the target temperature is still greater than the preset value, the fixed frequency fan is turned on and the frequency of the variable frequency fan is reduced until the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to the preset value.

[0091] In addition, if the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to the preset value after both the fixed-frequency fan and the variable-frequency fan of the right water tower 11 are turned on, the variable-frequency fan of the left water tower 11 is turned on. Similar to the fan 110 of the right water tower 11, the fixed-frequency fan of the left water tower 11 can be turned on as needed.

[0092] It should be noted that if the difference between the outlet water temperature and the target temperature is greater than 0 and the absolute value is greater than the preset value, it means that the outlet water temperature is greater than the target temperature and the difference between the outlet water temperature and the target temperature is large, which cannot meet the cooling requirements of cooling device 2. Therefore, the frequency of the variable frequency fan is increased first. If the outlet water temperature is still too high after the frequency of the variable frequency fan reaches the upper limit, the fixed frequency fan is turned on, and the frequency of the variable frequency fan is reduced based on the temperature difference between the outlet water temperature and the target temperature to avoid energy waste caused by the fan frequency being too high.

[0093] If the difference between the outlet water temperature and the target temperature is less than or becomes less than 0 and the absolute value is greater than the preset value, the control unit 30 shuts down the fixed-frequency fan and adjusts the frequency of the variable-frequency fan until the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to the preset value.

[0094] Specifically, if the difference between the outlet water temperature and the target temperature is less than 0 and its absolute value is greater than a preset value, the fixed-frequency fan of the left water tower 11 is shut down first, and the frequency of the variable-frequency fan of the left water tower 11 is gradually increased or decreased. At the same time, it is determined whether the absolute value of the difference between the outlet water temperature and the target temperature becomes less than or equal to the preset value. If the absolute value of the difference between the outlet water temperature and the target temperature becomes less than or equal to the preset value, the frequency of the variable-frequency fan is stopped from being increased or decreased. If shutting down the fixed-frequency fan and variable-frequency fan of the left water tower 11 still does not satisfy the requirement that the absolute value of the difference between the outlet water temperature and the target temperature becomes less than or equal to the preset value, then, similar to the fixed-frequency fan and variable-frequency fan of the left water tower 11, the fixed-frequency fan of the right water tower 11 is shut down, and the variable-frequency fan of the left water tower 11 can be further shut down as needed.

[0095] Please see Figure 5 The diagram shown is a structural schematic of a cooling tower according to another embodiment of this application. In this embodiment, two cooling towers 10 share a water supply pipe 12 and a return pipe 13. Two water pumps 141 transport cooling water to different cooling devices 2, such as ice machines, and two water pumps 142 return the cooled water, which has absorbed heat and increased in temperature, to the two cooling towers 10 via the return pipe 13. Each water tower 11 in the two cooling towers 10 has the same structure, and the fan 110 of each water tower 11 is a combination of fixed frequency and variable frequency. All water towers 11 in the cooling tower 10 are connected in series and in parallel with all water towers 11 in the other cooling tower 10. The two cooling towers 10 control the operating state of the fans 110 of their respective water towers 11 based on the difference between the outlet temperature of the water supply pipe 12 and the target temperature. The control logic prioritizes starting the fan 110 that is closer to the cooling device 2 (in other words, the shorter water supply path), such as... Figure 5 The fan 110 in the upper middle cooling tower 10 prioritizes shutting down the fan 110 that is turned on later. Other control logic is the same as described above and will not be repeated here.

[0096] In one embodiment, the power consumption of a fixed-frequency fan is the product of its rated power and time. The power consumption of a variable-frequency fan is (X / f) max ) 3 The product of rated power and time. Where X is the current frequency of the variable frequency fan, and f... max This is the maximum frequency of the variable frequency fan. The total power consumption of cooling tower 10 is the sum of the power consumption of all fixed frequency fans and variable frequency fans.

[0097] In another embodiment, the power consumption of the fixed-frequency fan is the product of the fan's aging coefficient, rated power, and time. The power consumption of the variable-frequency fan is (X / f) max ) 3 The product of the fan aging coefficient, rated power, and time. Where X is the current frequency of the variable frequency fan, and f... max This represents the maximum frequency of the variable frequency fan. The fan aging factor is a pre-set percentage based on the fan's condition, which can include the fan's usage time and health status.

[0098] In other embodiments, the total power consumption of the cooling tower 10 can also be obtained through multiple power lines connected to the cooling tower 10. For example, the total power consumption of the cooling tower 10 can be obtained by connecting multiple power lines connected to the cooling tower 10 through an electricity meter (not shown).

[0099] Furthermore, if the difference between the outlet water temperature and the target temperature is greater than 0 and the absolute value is greater than the preset value, the control unit 30 controls the number of fixed-frequency fans and variable-frequency fans to be turned on, and controls the frequency of the variable-frequency fans, until the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to the preset value, and the total power consumption of the cooling tower is minimized.

[0100] Specifically, if the difference between the outlet water temperature and the target temperature is greater than 0 and the absolute value is greater than the preset value, the control unit 30 analyzes various combinations of the number of fixed-frequency fans, the number of variable-frequency fans, and the frequency of variable-frequency fans that can make the absolute value of the difference between the outlet water temperature and the target temperature less than or equal to the preset value, calculates the total power consumption of each combination, determines the combination with the least total power consumption, and controls the number of fixed-frequency fans and variable-frequency fans and the frequency of variable-frequency fans based on the data of the combination with the least total power consumption.

[0101] If the difference between the outlet water temperature and the target temperature is less than or becomes less than 0 and the absolute value is greater than the preset value, control the number of fixed-frequency fans and variable-frequency fans that are turned on, and control the frequency of the variable-frequency fans, until the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to the preset value, and minimize the total power consumption of the cooling tower.

[0102] Specifically, if the difference between the outlet water temperature and the target temperature is less than or becomes less than 0 and the absolute value is greater than the preset value, the control unit 30 analyzes various combinations of the number of fixed-frequency fans, the number of variable-frequency fans, and the frequency of variable-frequency fans that can make the absolute value of the difference between the outlet water temperature and the target temperature less than or equal to the preset value, calculates the total power consumption of each combination, determines the combination with the least total power consumption, and controls the number of fixed-frequency fans and variable-frequency fans and the frequency of variable-frequency fans based on the data of the combination with the least total power consumption.

[0103] Please see Figure 6The diagram shown is a flowchart of a cooling tower energy-saving control method provided in a preferred embodiment of this application. The order of steps in the flowchart can be changed, and some steps can be omitted, depending on different requirements.

[0104] S601, obtain the outlet water temperature and ambient wet-bulb temperature of cooling tower 10, and determine the sum of ambient wet-bulb temperature and preset temperature as target temperature.

[0105] It should be noted that the target temperature is within the design outlet water temperature range of cooling tower 10. Optionally, the design outlet water temperature range is 16-32℃, that is, greater than or equal to 16℃ and less than or equal to 32℃. If the target temperature is lower than the lower limit of the design outlet water temperature range, the target temperature is the lower limit of the design outlet water temperature range, for example, 16℃. If the target temperature is higher than the upper limit of the design outlet water temperature range, the target temperature is the upper limit of the design outlet water temperature range, for example, 32℃.

[0106] Furthermore, the method also includes setting a target temperature for each water tower 11. In one embodiment, according to a first order, the target temperature of a later water tower 11 is set to be greater than the target temperature of an earlier water tower 11. For example, the first order is... Figure 2 As shown in the right-to-left sequence, the target temperature of the first water tower 11 is the ambient wet-bulb temperature +3℃, and the target temperature of the second water tower 11 is the ambient wet-bulb temperature +3.5℃.

[0107] As mentioned above, this setting avoids the frequent starting and stopping of the cooling towers due to setting the target temperature of both towers to the same value, which would cause oscillations in the cooling tower system. Preventing oscillations in the cooling tower system achieves energy savings, as the energy consumption during oscillations is greater than during normal operation or standby. Furthermore, because the target temperature of the rear cooling tower is set higher, the requirements for the number or frequency of fans are lower, further enhancing energy efficiency.

[0108] In other embodiments, the target temperature for each water tower may also be set to be the same.

[0109] S602 controls the operating status of the fan 110 of the cooling tower 10 based on the difference between the outlet water temperature and the target temperature.

[0110] In one embodiment, if the difference between the outlet water temperature and the target temperature is greater than 0 and its absolute value is greater than a preset value, the operating states of at least three water tower 11 fans 110 are controlled as needed in a first sequence until the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to the preset value. If the difference between the outlet water temperature and the target temperature is less than or becomes less than 0 and its absolute value is greater than the preset value, the operating states of at least three water tower 11 fans 110 are controlled as needed in a second sequence, opposite to the first sequence, until the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to the preset value. For example, the second sequence is... Figure 2 The water towers are shown in order from left to right. This preset value is a tolerance for the target temperature or a numerical range set based on that tolerance.

[0111] In one embodiment, the operating state includes at least one of on, frequency conversion, and off.

[0112] In one embodiment, controlling the operating state of the fans 110 of the cooling tower 10 includes: if the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to a preset value, controlling the fans 110 of at least three cooling towers 11 to shut down. The difference between the outlet water temperature and the target temperature is the difference obtained by subtracting the target temperature from the outlet water temperature. Optionally, the preset value is 0.5°C.

[0113] It should be noted that if the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to the preset value, it means that the difference between the outlet water temperature and the target temperature is small, and the outlet water temperature meets the target temperature. Therefore, at least three water tower 11 fans 110 are shut down to save energy.

[0114] like Figure 2 As shown, in one embodiment, all water towers 11 have the same structure, and the fans 110 of all water towers 11 are all fixed frequency, and all water towers 11 in the cooling tower 10 are connected in series.

[0115] In one embodiment, controlling the operating state of the fan 110 of the cooling tower 10 based on the difference between the outlet water temperature and the target temperature includes, as follows: Figure 7 The detailed process is shown below:

[0116] S701, if the difference between the outlet water temperature and the target temperature is greater than 0 and the absolute value is greater than the preset value, at least three water tower 11 fans 110 are turned on as needed in the first order until the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to the preset value.

[0117] Specifically, first, the fans 110 of the right water tower 11 are turned on one by one. After each fan 110 is turned on, it is determined whether the absolute value of the difference between the outlet water temperature and the target temperature becomes less than or equal to a preset value. If the absolute value of the difference between the outlet water temperature and the target temperature becomes less than or equal to the preset value, the fans 110 are turned off. If all the fans 110 of the right water tower 11 are turned on and the absolute value of the difference between the outlet water temperature and the target temperature is still greater than the preset value, then the fans 110 of the left water tower 11 are turned on one by one until the absolute value of the difference between the outlet water temperature and the target temperature becomes less than or equal to the preset value.

[0118] It should be noted that if the difference between the outlet water temperature and the target temperature is greater than 0 and the absolute value is greater than the preset value, it means that the outlet water temperature is greater than the target temperature and the difference between the outlet water temperature and the target temperature is large, which cannot meet the cooling requirements of cooling device 2. Therefore, the water in the water tower is cooled by turning on the fixed frequency fan to reduce the outlet water temperature in order to meet the cooling requirements of cooling device 2.

[0119] S702, if the difference between the outlet water temperature and the target temperature is less than or becomes less than 0 and the absolute value is greater than the preset value, at least three water tower 11 fans 110 are shut down as needed in a second order opposite to the first order, until the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to the preset value.

[0120] First, shut down the fans 110 of the left water tower 11 one by one. After shutting down each fan 110, check if the absolute value of the difference between the outlet water temperature and the target temperature becomes less than or equal to a preset value. If the absolute value of the difference between the outlet water temperature and the target temperature becomes less than or equal to the preset value, stop shutting down the fan 110. If all the fans 110 of the left water tower 11 have been shut down and the absolute value of the difference between the outlet water temperature and the target temperature is still greater than the preset value, then shut down the fans 110 of the right water tower 11 one by one until the absolute value of the difference between the outlet water temperature and the target temperature becomes less than or equal to the preset value.

[0121] It should be noted that if the difference between the outlet water temperature and the target temperature is less than 0 and the absolute value is greater than the preset value, it means that the outlet water temperature is lower than the target temperature and the difference between the outlet water temperature and the target temperature is large, and the outlet water temperature is too low. Therefore, the cooling effect on the water in the water tower is reduced by turning off the fixed frequency fan to save energy.

[0122] like Figure 4 As shown, in one embodiment, all water towers 11 have the same structure, and the fans 110 of all water towers 11 are a combination of fixed frequency and variable frequency, and all water towers 11 in the cooling tower 10 are connected in series.

[0123] In one embodiment, controlling the operating state of the fan 110 of the cooling tower 10 based on the difference between the outlet water temperature and the target temperature includes, as follows: Figure 8 The detailed process is shown below:

[0124] S801, if the difference between the outlet water temperature and the target temperature is greater than 0 and the absolute value is greater than the preset value, the variable frequency fan will be turned on. The frequency of the variable frequency fan will change according to the difference between the outlet water temperature and the target temperature.

[0125] Specifically, if the difference between the outlet water temperature and the target temperature is greater than 0 and the absolute value is greater than the preset value, the variable frequency fan of, for example, the water tower 11 on the right, is turned on and the frequency of the variable frequency fan is gradually increased. At the same time, it is determined whether the absolute value of the difference between the outlet water temperature and the target temperature becomes less than or equal to the preset value. If the absolute value of the difference between the outlet water temperature and the target temperature becomes less than or equal to the preset value, the frequency of the variable frequency fan is stopped from being increased. If the absolute value of the difference between the outlet water temperature and the target temperature is still greater than the preset value, the frequency of the variable frequency fan continues to be increased until the frequency upper limit is reached.

[0126] S802: If the variable frequency fan reaches its frequency limit, the fixed frequency fan will be activated. The frequency of the variable frequency fan will be adjusted in coordination with the fixed frequency fan according to the difference between the outlet water temperature and the target temperature, until the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to the preset value. One or more fixed frequency fans can be activated as needed.

[0127] Specifically, if the variable frequency fan reaches its frequency limit and the absolute value of the difference between the outlet water temperature and the target temperature is still greater than the preset value, the fixed frequency fan, such as the one in water tower 11 on the right, is turned on. At this time, the frequency of the variable frequency fan changes in coordination with the fixed frequency fan according to the difference between the outlet water temperature and the target temperature, until the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to the preset value.

[0128] In addition, if the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to the preset value after both the fixed-frequency fan and the variable-frequency fan of the right water tower 11 are turned on, the variable-frequency fan of the left water tower 11 is turned on. Similar to the fan 110 of the right water tower 11, the fixed-frequency fan of the left water tower 11 can be turned on as needed.

[0129] It should be noted that if the difference between the outlet water temperature and the target temperature is greater than 0 and the absolute value is greater than the preset value, it means that the outlet water temperature is greater than the target temperature and the difference between the outlet water temperature and the target temperature is large, which cannot meet the cooling requirements of cooling device 2. Therefore, the frequency of the variable frequency fan is increased first. If the outlet water temperature is still too high after the frequency of the variable frequency fan reaches the upper limit, the fixed frequency fan is turned on, and the frequency of the variable frequency fan is reduced based on the temperature difference between the outlet water temperature and the target temperature to avoid energy waste caused by the fan frequency being too high.

[0130] S803 If the difference between the outlet water temperature and the target temperature is less than or becomes less than 0 and the absolute value is greater than the preset value, turn off the fixed frequency fan and adjust the frequency of the variable frequency fan until the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to the preset value.

[0131] Specifically, if the difference between the outlet water temperature and the target temperature is less than 0 and its absolute value is greater than a preset value, the fixed-frequency fan of the left water tower 11 is shut down first, and the frequency of the variable-frequency fan of the left water tower 11 is gradually increased or decreased. At the same time, it is determined whether the absolute value of the difference between the outlet water temperature and the target temperature becomes less than or equal to the preset value. If the absolute value of the difference between the outlet water temperature and the target temperature becomes less than or equal to the preset value, the frequency of the variable-frequency fan is stopped from being increased or decreased. If shutting down the fixed-frequency fan and variable-frequency fan of the left water tower 11 still does not satisfy the requirement that the absolute value of the difference between the outlet water temperature and the target temperature becomes less than or equal to the preset value, then, similar to the fixed-frequency fan and variable-frequency fan of the left water tower 11, the fixed-frequency fan of the right water tower 11 is shut down, and the variable-frequency fan of the left water tower 11 can be further shut down as needed.

[0132] Furthermore, controlling the operating status of the cooling tower 10's fan 110 based on the difference between the outlet water temperature and the target temperature also includes, for example... Figure 9 The detailed process is shown below:

[0133] S901 If the difference between the outlet water temperature and the target temperature is greater than 0 and the absolute value is greater than the preset value, control the number of fixed-frequency fans and variable-frequency fans to be turned on, and control the frequency of the variable-frequency fans until the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to the preset value, and minimize the total power consumption of the cooling tower.

[0134] Specifically, if the difference between the outlet water temperature and the target temperature is greater than 0 and the absolute value is greater than the preset value, the analysis can make the absolute value of the difference between the outlet water temperature and the target temperature less than or equal to the preset value. The analysis can determine the number of fixed-frequency fans, the number of variable-frequency fans, and the frequency of variable-frequency fans, calculate the total power consumption of each combination, determine the combination with the least total power consumption, and control the number of fixed-frequency fans and variable-frequency fans and the frequency of variable-frequency fans based on the data of the combination with the least total power consumption.

[0135] S902, if the difference between the outlet water temperature and the target temperature is less than or becomes less than 0 and the absolute value is greater than the preset value, control the number of fixed-frequency fans and variable-frequency fans to be turned on, and control the frequency of the variable-frequency fans until the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to the preset value, and minimize the total power consumption of the cooling tower.

[0136] Specifically, if the difference between the outlet water temperature and the target temperature is less than or becomes less than 0 and the absolute value is greater than the preset value, the analysis can determine multiple combinations of the number of fixed-frequency fans, the number of variable-frequency fans, and the frequency of variable-frequency fans, where the absolute value of the difference between the outlet water temperature and the target temperature becomes less than or equal to the preset value. The total power consumption of each combination is calculated, the combination with the lowest total power consumption is determined, and the number of fixed-frequency fans and variable-frequency fans and the frequency of variable-frequency fans are controlled based on the data of the combination with the lowest total power consumption.

[0137] Please see Figure 10 The diagram shown is a structural schematic of an electronic device provided in a preferred embodiment of this application.

[0138] Electronic device 3 may be a personal computer, server, etc. Electronic device 3 includes, but is not limited to, a processor 301, a memory 302, and a computer program 303 stored in the memory 302 and executable on the processor 301. For example, the computer program 303 is a cooling tower energy-saving control program. When the processor 301 executes the computer program 303, it implements the steps in the cooling tower energy-saving control method, for example... Figure 6 The steps S601~S602 shown are as follows: Figure 7 S701~S702 shown, Figure 8 S801~S803 shown, Figure 9 S901~S902 are shown.

[0139] For example, computer program 303 may be divided into one or more modules / units, one or more of which are stored in memory 302 and executed by processor 301 to complete this application. One or more modules / units may be a series of computer program instruction segments capable of performing specific functions, and the instruction segments are used to describe the execution process of computer program 303 in electronic device 3.

[0140] Those skilled in the art will understand that the schematic diagram is merely an example of the electronic device 3 and does not constitute a limitation on the electronic device 3. It may include more or fewer components than shown, or combine certain components, or different components. For example, the electronic device 3 may also include input / output devices, network access devices, buses, etc.

[0141] Processor 301 can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor, processor 301, or any conventional processor. Processor 301 is the control center of electronic device 3, connecting various parts of the entire electronic device 3 through various interfaces and lines.

[0142] The memory 302 can be used to store computer programs 303 and / or modules / units. The processor 301 implements various functions of the electronic device 3 by running or executing the computer programs and / or modules / units stored in the memory 302 and by calling the data stored in the memory 302. The memory 302 may mainly include a program storage area and a data storage area. The program storage area may store the operating system, application programs required for at least one function (such as sound playback function, image playback function, etc.), etc.; the data storage area may store data created according to the use of the electronic device 3, etc. In addition, the memory 302 may include volatile and non-volatile memory, such as hard disk, memory, plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, at least one disk storage device, flash memory device, or other storage devices.

[0143] If the modules / units integrated in electronic device 3 are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying computer program code, recording media, USB flash drives, portable hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), and random access memory (RAM).

[0144] The cooling tower energy-saving control method, system, electronic equipment and storage medium provided in this application can adjust the cooling tower outlet water temperature based on the ambient wet-bulb temperature. When the cooling tower of this application is used to provide cooling water for cooling equipment, the cooling tower outlet water temperature is avoided to meet the cooling demand, which is conducive to the evaporation of heat from the cooling tower, thereby reducing energy consumption and improving energy efficiency. This is beneficial to energy conservation and environmental protection and is in line with the concepts of carbon neutrality and carbon peaking.

[0145] It will be apparent to those skilled in the art that this application is not limited to the details of the exemplary embodiments described above, and that this application can be implemented in other specific forms without departing from the spirit or essential characteristics of this application. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this application is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be embraced within this application. No reference numerals in the claims should be construed as limiting the scope of the claims. Furthermore, it is clear that the word "comprising" does not exclude other units or steps, and the singular does not exclude the plural. Multiple units or devices recited in the apparatus claims may also be implemented by the same unit or device in software or hardware. The terms "first," "second," etc., are used to indicate names and do not indicate any particular order.

[0146] The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this application without departing from the spirit and scope of the technical solutions of this application.

Claims

1. A cooling tower energy saving control method, characterized by, The method comprises: obtaining the outlet water temperature and the target temperature of the cooling tower; controlling the running state of the fan of the cooling tower according to the difference between the outlet water temperature and the target temperature, the running state comprising at least one of starting, frequency conversion and stopping; wherein the cooling tower comprises at least three water towers, if the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to a preset value, the fans of the at least three water towers are controlled to stop; if the difference between the outlet water temperature and the target temperature is greater than 0 and the absolute value is greater than the preset value, the running state of the fans of the at least three water towers is controlled in a first order until the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to the preset value; if the difference between the outlet water temperature and the target temperature is less than or becomes less than 0 and the absolute value is greater than the preset value, the running state of the fans of the at least three water towers is controlled in a second order opposite to the first order until the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to the preset value.

2. The cooling tower energy saving control method of claim 1, wherein: Further comprising obtaining the ambient wet bulb temperature of the cooling tower and calculating the sum of the ambient wet bulb temperature and a preset temperature, if the sum of the ambient wet bulb temperature and the preset temperature is within the design outlet water temperature range of the cooling tower, the target temperature is the sum of the ambient wet bulb temperature and the preset temperature; if the sum of the ambient wet bulb temperature and the preset temperature is lower than the lower limit of the design outlet water temperature range, the target temperature is the lower limit value of the design outlet water temperature range; or, if the sum of the ambient wet bulb temperature and the preset temperature is higher than the upper limit of the design outlet water temperature range, the target temperature is the upper limit value of the design outlet water temperature range.

3. The cooling tower energy saving control method of claim 2, wherein The obtaining of the outlet water temperature of the cooling tower comprises detecting the outlet water temperature of the cooling tower by a temperature transmitter arranged on the water supply pipe of the cooling tower; The obtaining of the ambient wet bulb temperature of the cooling tower comprises detecting the ambient wet bulb temperature by a wet bulb temperature transmitter arranged in the field environment of the cooling tower.

4. The cooling tower energy saving control method of claim 1 wherein, The method further comprises: according to the first order, setting the target temperature of a later water tower to be greater than that of an earlier water tower; wherein the cooling tower is connected to a cooling device through a water supply pipe, the first order is the order from near to far to the cooling device, and the earlier water tower is closer to the cooling device than the later water tower.

5. The cooling tower energy saving control method of claim 1 wherein, The controlling of the running state of the fan of the cooling tower according to the difference between the outlet water temperature and the target temperature comprises: in the case that the at least three water towers are of the same structure and the fans of the at least three water towers are all fixed frequency, if the difference between the outlet water temperature and the target temperature is greater than 0 and the absolute value is greater than the preset value, the fans of the at least three water towers are started in the first order until the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to the preset value; If the difference between the outlet water temperature and the target temperature is less than or becomes less than 0 and the absolute value is greater than the preset value, the fans of the at least three water towers are closed in a second sequence opposite to the first sequence until the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to the preset value.

6. The cooling tower energy saving control method of claim 5 wherein, The cooling tower is connected with the cooling equipment through a water supply pipe, and the at least three water towers include a first water tower and a second water tower arranged in sequence, and the first water tower is closer to the cooling equipment; The first sequence includes: preferentially opening the fixed-frequency fans of the first water tower, and if the difference between the outlet water temperature and the target temperature is still greater than 0 and the absolute value of the difference is still greater than the preset value after opening all the fixed-frequency fans of the first water tower, then opening the fixed-frequency fans of the second water tower until the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to the preset value; or The second sequence opposite to the first sequence includes: preferentially closing the fixed-frequency fans of the second water tower, and if the difference between the outlet water temperature and the target temperature is still less than 0 and the absolute value of the difference is still greater than the preset value after closing all the fixed-frequency fans of the second water tower, then closing the fixed-frequency fans of the first water tower until the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to the preset value.

7. The cooling tower energy saving control method of claim 1 wherein, The control of the running state of the fans of the cooling tower according to the difference between the outlet water temperature and the target temperature includes: in the case that the at least three water towers are of the same structure and the fans of the at least three water towers are a combination of fixed-frequency and variable-frequency, if the difference between the outlet water temperature and the target temperature is greater than 0 and the absolute value is greater than the preset value, a variable-frequency fan is opened, and the frequency of the variable-frequency fan changes according to the difference between the outlet water temperature and the target temperature; if the variable-frequency fan reaches the upper limit of the frequency, a fixed-frequency fan is opened, and the frequency of the variable-frequency fan changes according to the difference between the outlet water temperature and the target temperature in cooperation with the fixed-frequency fan until the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to the preset value; if the difference between the outlet water temperature and the target temperature is less than or becomes less than 0 and the absolute value is greater than the preset value, the opened fixed-frequency fan is closed, and the frequency of the variable-frequency fan is adjusted until the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to the preset value.

8. The cooling tower energy saving control method of claim 7 wherein, The cooling tower is connected with the cooling equipment through a water supply pipe, and the at least three water towers include a first water tower and a second water tower arranged in sequence, and the first water tower is closer to the cooling equipment; The if the difference between the outlet water temperature and the target temperature is greater than 0 and the absolute value is greater than the preset value, the variable frequency fan is started and the if the variable frequency fan reaches the upper limit of the frequency, the fixed frequency fan is started, which comprises: The variable frequency fan of the first water tower is preferentially started, and if the difference between the outlet water temperature and the target temperature is still greater than 0 and the absolute value of the difference is still greater than the preset value, the frequency of the variable frequency fan of the first water tower is continuously increased until the upper limit of the frequency is reached; the if the variable frequency fan reaches the upper limit of the frequency, the fixed frequency fan of the first water tower is preferentially started, wherein the frequency of the variable frequency fan of the first water tower is changed according to the difference between the outlet water temperature and the target temperature and the fixed frequency fan of the first water tower cooperatively until the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to the preset value; when the absolute value of the difference between the outlet water temperature and the target temperature cannot be less than or equal to the preset value after the variable frequency fan and the fixed frequency fan of the first water tower are both started, the variable frequency fan of the second water tower is started again, the frequency of the variable frequency fan of the second water tower is changed according to the difference between the outlet water temperature and the target temperature; if the variable frequency fan of the second water tower reaches the upper limit of the frequency, the difference between the outlet water temperature and the target temperature is still greater than 0 and the absolute value of the difference is still greater than the preset value, the fixed frequency fan of the second water tower is started again, wherein the frequency of the variable frequency fan of the second water tower is changed according to the difference between the outlet water temperature and the target temperature and the fixed frequency fan of the second water tower cooperatively until the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to the preset value; or The if the difference between the outlet water temperature and the target temperature is less than or becomes less than 0 and the absolute value is greater than the preset value, the started fixed frequency fan is closed, the frequency of the variable frequency fan is adjusted until the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to the preset value, which comprises: The if the difference between the outlet water temperature and the target temperature is less than or becomes less than 0 and the absolute value is greater than the preset value, the started fixed frequency fan is closed, the frequency of the variable frequency fan is adjusted until the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to the preset value, which comprises: Preferentially closing the fixed-frequency fan of the second water tower, and gradually increasing or decreasing the frequency of the variable-frequency fan of the second water tower, while judging whether the absolute value of the difference between the outlet water temperature and the target temperature becomes less than or equal to the preset value; if the absolute value of the difference between the outlet water temperature and the target temperature becomes less than or equal to the preset value, stopping increasing or decreasing the frequency of the variable-frequency fan of the second water tower; if the absolute value of the difference between the outlet water temperature and the target temperature still cannot become less than or equal to the preset value after the fixed-frequency fan and the variable-frequency fan of the second water tower are closed, preferentially closing the fixed-frequency fan of the first water tower which is opened, and gradually increasing or decreasing the frequency of the variable-frequency fan of the first water tower, while judging whether the absolute value of the difference between the outlet water temperature and the target temperature becomes less than or equal to the preset value, if the absolute value of the difference between the outlet water temperature and the target temperature becomes less than or equal to the preset value, stopping increasing or decreasing the frequency of the variable-frequency fan of the first water tower, until the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to the preset value.

9. The cooling tower energy saving control method of claim 7 wherein, The power consumption of the fixed-frequency fan is the product of rated power and time, the power consumption of the variable-frequency fan is the product of (X / f max ) 3 , rated power and time, X is the current frequency of the variable-frequency fan, f max is the maximum frequency of the variable-frequency fan, and the total power consumption of the cooling tower is the sum of the power consumptions of all fixed-frequency fans and variable-frequency fans.

10. The cooling tower energy saving control method of claim 7 wherein, The method further comprises: obtaining the total power consumption of the cooling tower through a plurality of power lines connected with the cooling tower.

11. The cooling tower energy saving control method of claim 10 wherein, The method further comprises: if the difference between the outlet water temperature and the target temperature is greater than 0 and the absolute value is greater than the preset value, controlling the opening number of the fixed-frequency fan and the variable-frequency fan, and controlling the frequency of the variable-frequency fan, until the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to the preset value, and the total power consumption of the cooling tower is minimized; and if the difference between the outlet water temperature and the target temperature is less than or becomes less than 0 and the absolute value is greater than the preset value, controlling the opening number of the fixed-frequency fan and the variable-frequency fan, and controlling the frequency of the variable-frequency fan, until the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to the preset value, and the total power consumption of the cooling tower is minimized.

12. An energy saving control system for cooling towers, characterized in that, The system comprises: a cooling tower comprising at least three water towers, each water tower being provided with at least one fan; a temperature acquisition unit configured to acquire an outlet water temperature and a target temperature of the cooling tower; an adjustment and control unit configured to control a running state of a fan of the cooling tower according to a difference between the outlet water temperature and the target temperature, the running state comprising at least one of opening, variable frequency and closing; and a power consumption acquisition unit configured to acquire a total power consumption of the cooling tower. If an absolute value of a difference between the outlet water temperature and the target temperature is less than or equal to a preset value, the adjusting control unit controls the fans of the at least three water towers to be closed; if the absolute value of the difference between the outlet water temperature and the target temperature is greater than 0 and greater than the preset value, the adjusting control unit controls operating states of the fans of the at least three water towers in a first order until the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to the preset value; if the difference between the outlet water temperature and the target temperature is less than or becomes less than 0 and the absolute value is greater than the preset value, the adjusting control unit controls the operating states of the fans of the at least three water towers in a second order opposite to the first order until the absolute value of the difference between the outlet water temperature and the target temperature is less than or equal to the preset value.

13. The cooling tower energy saving control system of claim 12 wherein, The temperature acquisition unit is further configured to: According to the first order, a target temperature of a later water tower is set to be greater than a target temperature of an earlier water tower, wherein the cooling tower is connected to the cooling device through a water supply pipe, the first order is an order from near to far to the cooling device, and the earlier water tower is closer to the cooling device than the later water tower.

14. An electronic device, comprising: The electronic device comprises: a processor; and a memory having a plurality of program modules stored therein, the plurality of program modules being loaded and executed by the processor to perform the cooling tower energy-saving control method according to any one of claims 1 to 11.

15. A computer readable storage medium having stored thereon at least one computer instruction, wherein, The instructions are loaded and executed by the processor to perform the cooling tower energy-saving control method according to any one of claims 1 to 11.

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