CN110118509B - Energy-saving control method and system for cooling tower fan - Google Patents
Energy-saving control method and system for cooling tower fan Download PDFInfo
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- CN110118509B CN110118509B CN201910505371.8A CN201910505371A CN110118509B CN 110118509 B CN110118509 B CN 110118509B CN 201910505371 A CN201910505371 A CN 201910505371A CN 110118509 B CN110118509 B CN 110118509B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
- F28F27/003—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus specially adapted for cooling towers
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Abstract
The application discloses a cooling tower fan energy-saving control method and system, and belongs to the technical field of refrigeration. The method is applied to a cooling tower, wherein the cooling tower is provided with a variable frequency fan; the method comprises the following steps: acquiring the current actual outlet water temperature of the cooling tower; judging whether the relation between the current actual outlet water temperature and the current set outlet water temperature meets a preset condition or not; if so, controlling the variable frequency fan to operate for a first preset time length based on a preset outlet water temperature, wherein the preset outlet water temperature is less than the current actual outlet water temperature; acquiring the actual outlet water temperature of the cooling tower within the first preset time; determining a target outlet water temperature based on the actual outlet water temperature within the first preset time period; and controlling the operation of the variable frequency fan based on the target outlet water temperature. The method can monitor and adjust the outlet water temperature of the cooling tower in real time by using external parameters, achieve ideal refrigeration effect, save energy and improve the refrigeration effect of the cold source control system.
Description
Technical Field
The application belongs to the technical field of refrigeration, and particularly relates to a cooling tower fan energy-saving control method and system.
Background
In the cold source control system, the cooling tower is used as a main operation device for heat dissipation, and whether the cooling tower can operate efficiently and in an energy-saving manner is related to the operation efficiency of the cooling tower, and meanwhile, the refrigeration effect of the cold source control system is influenced to a great extent. Taking a data center as an example, the heat sink control system accounts for about 4-6 of the energy consumption of the data center. The cold machine can save energy by 2-5% when the temperature of the outlet water of the cooling tower is reduced by 1 ℃, so that the fluctuation of the temperature is important for the energy saving of the whole cold source control system.
The existing cold source control system grabs the set value of the outlet water temperature of the cooling tower and completely depends on the setting of an operator according to experience, the operator has great uncertainty and cannot adjust the set value in real time according to variable data (weather, load and equipment characteristics), and thus the set value of the outlet water temperature is too high or too low. If the set value of the outlet water temperature is too low (smaller than the approximate value of the cooling tower under the scene, namely lower than the lower limit of heat exchange of the wet bulb temperature), the fan of the cooling tower is operated in full frequency due to the too low set value, and the fan still cannot reach the set value even if the fan is operated in full frequency due to meteorological conditions, so that energy waste is caused; if the set value is too high (greater than the upper approximate value of the cooling tower in the scene, namely, greater than the upper limit of the heat exchange capacity of the wet bulb temperature), the operating frequency of the fan of the cooling tower is too low due to the too high set value, and the outdoor energy cannot be fully utilized to reduce the outlet water temperature of the cooling tower, so that the utilization efficiency of the cold source is reduced.
Disclosure of Invention
In view of this, an object of the present application is to provide a method and a system for controlling energy saving of a cooling tower fan, so as to solve the problem that the existing cooling tower has inaccurate temperature setting (too high or too low), resulting in low utilization efficiency of a cold source or energy waste.
The embodiment of the application is realized as follows:
in a first aspect, an embodiment of the present application provides an energy-saving control method for a cooling tower fan, which is applied to a cooling tower, where the cooling tower is provided with a variable frequency fan; the method comprises the following steps: acquiring the current actual outlet water temperature of the cooling tower; judging whether the relation between the current actual outlet water temperature and the current set outlet water temperature meets a preset condition or not; if so, controlling the variable frequency fan to operate for a first preset time length based on a preset outlet water temperature, wherein the preset outlet water temperature is less than the current actual outlet water temperature; acquiring the actual outlet water temperature of the cooling tower within the first preset time; determining a target outlet water temperature based on the actual outlet water temperature within the first preset time period; and controlling the operation of the variable frequency fan based on the target outlet water temperature.
In the embodiment of the application, when the relation between the current actual outlet water temperature of the cooling tower and the current set outlet water temperature is monitored to meet the preset condition, the frequency conversion fan is controlled to operate for the first preset duration based on the preset outlet water temperature, so that the cooling tower can be rapidly refrigerated, the actual outlet water temperature of the cooling tower under the condition is obtained, the target outlet water temperature is determined based on the actual outlet water temperature of the cooling tower, the situation that the target outlet water temperature is set too high to reduce the refrigeration effect is avoided, or the target outlet water temperature is set too low to cause energy waste is avoided, so that the outlet water temperature of the cooling tower can be monitored and adjusted in real time by using external parameters, the ideal refrigeration effect is achieved, energy is saved, and the refrigeration effect of the cold source control system is improved.
With reference to the embodiment of the first aspect, in a possible implementation manner, a water outlet of the cooling tower is provided with a temperature sensor, and acquiring a current actual outlet water temperature of the cooling tower includes: acquiring the outlet water temperature monitored by the temperature sensor for multiple times within a second preset time according to a preset time interval; and acquiring an average value of the outlet water temperatures, wherein the average value is the current actual outlet water temperature of the cooling tower. In the embodiment of the application, the outlet water temperature within a period of time is obtained for multiple times according to the preset time interval, and the average value of the obtained outlet water temperatures is used as the current actual outlet water temperature of the cooling tower, so that the accuracy and the reliability of the current actual outlet water temperature of the cooling tower are improved.
With reference to the embodiment of the first aspect, in a possible implementation manner, obtaining an average value of a plurality of outlet water temperatures includes: rejecting outliers in the plurality of outlet water temperatures; and acquiring the average value of the outlet water temperatures after the abnormal values are eliminated. In the embodiment of the application, the influence of the abnormal value is eliminated by removing the abnormal value, such as an extreme value, in the outlet water temperature, and the accuracy and the reliability of the result can be further ensured.
With reference to the first aspect, in a possible implementation manner, the determining whether a relationship between the current actual outlet water temperature and the current set outlet water temperature satisfies a preset condition includes: and judging whether the absolute value of the difference value between the current actual outlet water temperature and the current set outlet water temperature is greater than a preset threshold value or not, and if so, representing that the preset condition is met. In the embodiment of the application, whether the preset condition is met or not is judged by judging whether the absolute value of the difference value between the current actual outlet water temperature and the current set outlet water temperature is larger than the preset threshold value or not, and the problem that the cold source utilization efficiency is low or the energy is wasted due to the fact that the difference value between the current actual outlet water temperature and the current set outlet water temperature is too large is avoided.
With reference to the first aspect, in a possible implementation manner, a water outlet of the cooling tower is provided with a temperature sensor, and acquiring an actual outlet water temperature of the cooling tower within the first preset time period includes: acquiring the outlet water temperature monitored by the temperature sensor for multiple times within the first preset time according to a preset time interval; and taking the average value of the plurality of outlet water temperatures acquired within the first preset time as the actual outlet water temperature of the cooling tower. In the embodiment of the application, the outlet water temperature within a period of time is obtained for multiple times according to the preset time interval, and the average value of the obtained outlet water temperatures is used as the actual outlet water temperature of the cooling tower, so that the accuracy and the reliability of the actual outlet water temperature of the cooling tower are improved.
With reference to the embodiment of the first aspect, in a possible implementation manner, the determining a target outlet water temperature based on an actual outlet water temperature within the first preset time period includes: and taking the value obtained by multiplying the actual water outlet temperature within the first preset time with a preset deviation coefficient as the target water outlet temperature, wherein the preset deviation coefficient is more than 1 and less than 1.1. In the embodiment of the application, when the target outlet water temperature is determined, a value obtained by multiplying the actual outlet water temperature within the first preset time by a preset deviation coefficient slightly larger than 1 is used as the target outlet water temperature, so that the influence of temperature fluctuation on the target outlet water temperature is avoided, and the refrigeration or energy saving effect is further improved.
In a second aspect, an embodiment of the present application further provides an energy-saving control system for a cooling tower blower, which is applied to a cooling tower, and the energy-saving control system for a cooling tower blower includes a blower control device and a variable frequency blower connected to the blower control device; the fan control device is used for acquiring the current actual outlet water temperature of the cooling tower; the fan control device is also used for judging whether the relation between the current actual outlet water temperature and the current set outlet water temperature meets a preset condition or not; the fan control device is also used for controlling the variable frequency fan to operate for a first preset time based on a preset outlet water temperature when the current actual outlet water temperature is higher than the preset outlet water temperature; the fan control device is also used for acquiring the actual outlet water temperature of the cooling tower within the first preset time; the fan control device is also used for determining a target outlet water temperature based on the actual outlet water temperature within the first preset time; the fan control device is also used for controlling the operation of the variable frequency fan based on the target outlet water temperature.
With reference to the second aspect, in a possible implementation manner, the energy-saving control system for a fan of a cooling tower further includes a temperature sensor disposed at the water outlet of the cooling tower, and the fan control device is configured to: acquiring the outlet water temperature monitored by the temperature sensor for multiple times within a second preset time according to a preset time interval; and acquiring an average value of the outlet water temperatures, wherein the average value is the current actual outlet water temperature of the cooling tower.
With reference to the embodiment of the second aspect, in a possible implementation manner, the fan control device is further configured to: rejecting outliers in the plurality of outlet water temperatures; and acquiring the average value of the outlet water temperatures after the abnormal values are eliminated.
With reference to the embodiment of the second aspect, in a possible implementation manner, the fan control device is further configured to: and judging whether the absolute value of the difference value between the current actual outlet water temperature and the current set outlet water temperature is greater than a preset threshold value or not, and if so, representing that the preset condition is met.
With reference to the embodiment of the second aspect, in a possible implementation manner, the water outlet of the cooling tower is provided with a temperature sensor, and the fan control device is further configured to: acquiring the outlet water temperature monitored by the temperature sensor for multiple times within the first preset time according to a preset time interval; and acquiring the average value of the water outlet temperatures within the first preset time, wherein the average value of the water outlet temperatures within the first preset time is the actual water outlet temperature.
With reference to the embodiment of the second aspect, in a possible implementation manner, the fan control device is further configured to: and taking the value obtained by multiplying the actual water outlet temperature within the first preset time with a preset deviation coefficient as the target water outlet temperature, wherein the preset deviation coefficient is more than 1 and less than 1.1.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the embodiments of the application. The objectives and other advantages of the application may be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts. The foregoing and other objects, features and advantages of the application will be apparent from the accompanying drawings. Like reference numerals refer to like parts throughout the drawings. The drawings are not intended to be to scale as practical, emphasis instead being placed upon illustrating the subject matter of the present application.
FIG. 1 is a schematic flow chart illustrating a method for controlling energy conservation of a cooling tower fan according to an embodiment of the present application;
FIG. 2 is a schematic diagram illustrating changes in the outlet water temperature of a cooling tower under a scenario provided by an embodiment of the present application;
FIG. 3 is a schematic diagram illustrating changes in the outlet water temperature of a cooling tower in yet another scenario provided by an embodiment of the present application;
fig. 4 shows a schematic structural diagram of a cooling tower fan energy-saving control system provided by an embodiment of the application.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, relational terms such as "first," "second," and the like may be used solely in the description herein to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Further, the term "and/or" in the present application is only one kind of association relationship describing the associated object, and means that three kinds of relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone.
First embodiment
Referring to fig. 1, for a method for controlling energy saving of a fan of a cooling tower applied to the cooling tower according to an embodiment of the present application, steps included in the method will be described with reference to fig. 1. Wherein, the cooling tower is provided with the frequency conversion fan.
Step S101: and acquiring the current actual outlet water temperature of the cooling tower.
And when the cooling tower needs to be subjected to heat dissipation control, acquiring the current actual outlet water temperature of the cooling tower. The actual outlet water temperature of the cooling tower is monitored in real time by arranging the temperature sensor at the water outlet of the cooling tower, and as an implementation mode, the temperature acquired by the temperature sensor at present can be used as the current actual outlet water temperature of the cooling tower. As another embodiment, the average value of the temperatures collected by the temperature sensors acquired for a plurality of times in a period of time can be used as the current actual outlet water temperature of the cooling tower. For example, according to a preset time interval, the outlet water temperature monitored by the temperature sensor is obtained for multiple times within a second preset time period; and acquiring an average value of the plurality of outlet water temperatures within a second preset time, wherein the average value is the current actual outlet water temperature of the cooling tower. For convenience of understanding, the preset time interval is 10 seconds, and the second preset time duration is 6 minutes, that is, in 6 minutes, the outlet water temperature monitored by the temperature sensor is obtained every 10 seconds, a total of 36 outlet water temperatures can be obtained, and an average value of the 36 outlet water temperatures is calculated, where the average value is the current actual outlet water temperature of the cooling tower.
Of course, when the average value of the outlet water temperatures is obtained, the abnormal values in the outlet water temperatures can be removed first; then, the average value of a plurality of outlet water temperatures after the abnormal values are removed is obtained to reduce the influence of extreme values on the final value, for example, after 36 outlet water temperatures are obtained, the maximum value and the minimum value are removed from the outlet water temperatures, and then the average value of the remaining 34 outlet water temperatures is calculated.
Of course, as another embodiment, a plurality of temperature sensors may be disposed at the water outlet of the cooling tower, and then the average value of the outlet water temperatures collected by the temperature sensors may be calculated. That is, when calculating the average value, the average value of the outlet water temperatures acquired by one temperature sensor may be calculated, or the average value of the outlet water temperatures acquired by a plurality of temperature sensors at least once may be calculated.
Step S102: and judging whether the relation between the current actual outlet water temperature and the current set outlet water temperature meets a preset condition or not.
After the current actual outlet water temperature of the cooling tower is obtained, whether the relation between the current actual outlet water temperature and the current set outlet water temperature meets a preset condition or not is judged, if yes, the step S103 is executed, and if not, the steps S101 and S102 are continuously executed.
As an implementation manner, when determining whether the relationship between the current actual outlet water temperature and the current set outlet water temperature satisfies a preset condition, it may be determined whether an absolute value of a difference between the current actual outlet water temperature and the current set outlet water temperature is greater than a preset threshold, and if the absolute value is greater than the preset threshold, the representation satisfies the preset condition. For the convenience of understanding, the following example will be explained, and it is assumed that Wtime represents the current actual leaving water temperature, and wavgntote represents the current set leaving water temperature, the above process is to determine | Wtime-wavgntote | > 1? If the absolute value of the difference between Wtime and wavgote is greater than a preset threshold (for example, 1), the representation meets a preset condition, and step S103 is executed, otherwise, steps S101 and S102 are continued. It is understood that the preset threshold is not limited to 1, and may be other relatively close values, such as 1.5 and 2.
Of course, as another embodiment, it is determined whether the relationship between the current actual outlet water temperature and the current set outlet water temperature satisfies the preset condition, or it may be determined whether the relationship between the current actual outlet water temperature and the current set outlet water temperature satisfies the preset condition
or
If the relationship between Wtime and Wavgmote satisfies
Or satisfy
The representation meets the preset condition, step S103 is executed, otherwise, steps S101 and S102 are continued.
Step S103: and controlling the frequency conversion fan to operate for a first preset time based on the preset water outlet temperature.
Whether the relation between the current actual outlet water temperature and the current set outlet water temperature meets a preset condition or not, namely when the absolute value of the difference value of Wtime minus Wavgntote is greater than a preset threshold value (for example 1), the frequency conversion fan is controlled to operate for a first preset time length based on the preset outlet water temperature so as to rapidly refrigerate the cooling tower, and follow-up operation is executed under the condition, so that adverse effects caused by overhigh set outlet water temperature is avoided, and the finally determined target outlet water temperature value is more reasonable. And the preset outlet water temperature is lower than the current actual outlet water temperature. For example, when whether the relationship between the current actual outlet water temperature and the current set outlet water temperature meets a preset condition or not, the variable frequency fan is controlled to operate for a first preset time period, such as 5 minutes, based on the preset outlet water temperature of 16 ℃. As an embodiment, the preset outlet water temperature may be the lowest temperature achievable by the cooling tower, for example, 16 degrees celsius, but it is understood that the preset outlet water temperature is not necessarily the lowest temperature achievable by the cooling tower, and may be a relatively low temperature, for example, 16.5 degrees celsius. It is understood that the first preset time period is not limited to the above 5 minutes, and may be 4 minutes, 6 minutes, or the like.
Step S104: and acquiring the actual outlet water temperature of the cooling tower within the first preset time.
And when the variable frequency fan operates for a first preset time based on the preset water outlet temperature, acquiring the actual water outlet temperature of the cooling tower in the period of time. Optionally, the process is similar to the process of step S101, for example, the outlet water temperature monitored by the temperature sensor may be obtained multiple times within the first preset time period according to a preset time interval; and taking the average value of the plurality of outlet water temperatures acquired within the first preset time as the actual outlet water temperature of the cooling tower. For example, the outlet water temperature monitored by the temperature sensor is obtained for multiple times within 5 minutes at intervals of 10 seconds, so that 30 outlet water temperatures can be obtained, and the average value of the 30 outlet water temperatures is used as the actual outlet water temperature of the cooling tower.
Of course, when obtaining the average value of a plurality of outlet water temperatures, it may also be that an abnormal value in the plurality of outlet water temperatures is removed first; then, the average value of a plurality of outlet water temperatures after the abnormal values are removed is obtained to reduce the influence of extreme values on the final value, for example, after 30 outlet water temperatures are obtained, the maximum value and the minimum value are removed from the outlet water temperatures, and then the average value of the remaining 28 outlet water temperatures is calculated.
Step S105: and determining a target outlet water temperature based on the actual outlet water temperature within the first preset time.
The method comprises the steps of obtaining the actual outlet water temperature of the cooling tower within the first preset time period, and determining a target outlet water temperature based on the actual outlet water temperature within the first preset time period, wherein the value obtained by multiplying the actual outlet water temperature within the first preset time period by a preset deviation coefficient is used as the target outlet water temperature, and the preset deviation coefficient is more than 1 and less than 1.1.
As another embodiment, the target outlet water temperature may also be the actual outlet water temperature of the cooling tower within the first preset time period.
Step S106: and controlling the operation of the variable frequency fan based on the target outlet water temperature.
And after the target outlet water temperature of the cooling tower is determined, controlling the operation of the variable frequency fan based on the target outlet water temperature.
It should be noted that, in the whole process of controlling the outlet water temperature of the cooling tower, the above steps S101 to S105 are repeated, so that the outlet water temperature of the cooling tower can be adjusted in real time, and the ideal refrigeration effect is achieved while energy is saved.
To facilitate understanding of the above control process, as will be exemplified below, assuming that the current set outlet water temperature of the cooling tower is 22 ℃, the average real-time value of the outlet water temperature of the cooling tower (i.e. the current actual outlet water temperature of the cooling tower) in 6 minutes is 19 ℃, at this time, since the relationship between the current actual outlet water temperature (19 ℃) and the current set outlet water temperature (22 ℃) satisfies the preset condition (i.e. the absolute value of the difference between the two values is greater than 1), the reset condition is activated, at this time, the variable frequency fan is controlled to operate for 5 minutes (the first preset time length) at 16 ℃ (the preset outlet water temperature of the cooling tower), if the actual outlet water temperature of the cooling tower within 5 minutes is 18 ℃ (i.e. the average real-time value of the outlet water temperature of the cooling tower within 5 minutes is 18 ℃), at this time, the target outlet water temperature is the product of the actual outlet water temperature and the preset deviation coefficient, i.e. equal to 18 ＊ 1.02.02 ═ 18.36.
The target leaving water temperature is 18.36 ℃, which is the current set leaving water temperature of the next round, that is, when the next round is started, the current set leaving water temperature is 18.36 ℃, since the meteorological temperature rises for 6 minutes, the mean real-time value of the leaving water temperature of the cooling tower (that is, the current actual leaving water temperature of the cooling tower) is 21 ℃, at this time, since the relationship between the current actual leaving water temperature (18.36 ℃) and the current set leaving water temperature (21 ℃) meets the preset condition (that is, the absolute value of the difference between the two values is greater than 1), the reset condition is activated, at this time, the variable frequency fan is controlled to operate for 5 minutes (the first preset time length) by 16 ℃ (the preset leaving water temperature of the cooling tower), if the actual leaving water temperature of the cooling tower within 5 minutes is 20 ℃ (that is, the mean real-time value of the leaving water temperature of the cooling tower within 5 minutes is 20 ℃), at this time, the target leaving water temperature is the product of the actual leaving water temperature and the preset deviation coefficient, that is equal to 20 ＊ 1.02.02 to 20.4 ℃, and then the variable frequency fan is controlled to operate by the target leaving water temperature.
In order to facilitate understanding of the effect of the cooling tower fan energy saving control method provided by the embodiment of the present application, reference may be made to fig. 2 and fig. 3 to show schematic diagrams of changes in the cooling tower outlet water temperature in different scenarios. It can be clearly seen from fig. 2 and fig. 3 that the change of the outlet water temperature of the cooling tower set by applying the energy-saving control method for the cooling tower fan provided by the embodiment of the present application and the existing manual setting by relying on experience is different. As can be seen from the drawings (fig. 2 and 3), the energy-saving control method for the cooling tower fan provided by the embodiment of the application can realize automatic control to replace manual operation, and can fully utilize the ambient temperature to regulate and control the outlet water temperature of the cooling tower so as to achieve the energy-saving effect. Conventional manual operation may not be able to adjust the outlet water temperature of the cooling tower in real time according to the external parameters (ambient temperature) and the internal parameters (load). If the set value of the outlet water temperature of the cooling tower is too high (is larger than the upper approximate value of the cooling tower in the scene, namely is higher than the upper limit of heat exchange of the wet bulb temperature), the cold source is not fully utilized; on the contrary, if the set value of the outlet water temperature of the cooling tower is too low (smaller than the approximate value of the cooling tower under the scene, namely lower than the lower limit of the heat exchange of the wet bulb temperature), the full-frequency operation of the cooling tower can not reach the set outlet water temperature, and the energy waste is caused. The cooling tower fan energy-saving control method can monitor and adjust the outlet water temperature of the cooling tower in real time by using external parameters, so that an ideal refrigeration effect is achieved and energy is saved.
Fig. 2 is a comparison diagram of an average real-time value of the outlet water temperature of the cooling tower, a set value in the prior art and a set value in the energy-saving control method for the fan of the cooling tower provided by the embodiment of the present application, when the set value of the outlet water temperature of the cooling tower is too high. Fig. 3 is a comparison diagram of an average real-time value of the outlet water temperature of the cooling tower, a set value in the prior art, and a set value in the energy-saving control method for the fan of the cooling tower according to the embodiment of the present application, when the set value of the outlet water temperature of the cooling tower is too low.
In fig. 2 and fig. 3, a represents a set value of an outlet water temperature of the cooling tower under manual operation, B represents an average real-time value of the outlet water temperature of the cooling tower, and C represents a set value of the outlet water temperature of the cooling tower under the application of the energy-saving control method for the fan of the cooling tower provided in the embodiment of the present application.
Second embodiment
The embodiment of the present application further provides a cooling tower fan energy-saving control system 100 applied in a cooling tower, as shown in fig. 4. This cooling tower fan energy-saving control system 100 includes: memory 120, fan control 130, temperature sensor 110, and variable frequency fan 140.
The fan control device 130 and the memory 120, the temperature sensor 110 and the variable frequency fan 140 are electrically connected to each other directly or indirectly to realize data transmission or interaction. For example, the components may be electrically connected to each other via one or more communication buses or signal lines. The temperature sensor 110 is used to collect the outlet water temperature at the outlet of the cooling tower and transmit it to the fan control device 130. The Memory 120 may be a Random Access Memory (RAM) 120, or a non-volatile Memory 120, such as at least one disk Memory 120. The memory 120 stores therein computer-readable instructions (computer program) including at least one software functional module which can be stored in the form of software or firmware (firmware) in the memory 120. The fan control device 130 is configured to execute the computer readable instructions stored in the memory 120 to execute the steps included in the cooling tower fan energy saving control method provided in the embodiment of the present application. For example, the fan control device 130 is configured to obtain a current actual outlet water temperature of the cooling tower; the fan control device 130 is further configured to determine whether a relationship between the current actual outlet water temperature and the current set outlet water temperature meets a preset condition; the fan control device 130 is further configured to, if yes, control the variable frequency fan 140 to operate for a first preset time period based on a preset outlet water temperature, where the preset outlet water temperature is less than the current actual outlet water temperature; the fan control device 130 is further configured to obtain an actual outlet water temperature of the cooling tower within the first preset time period; the fan control device 130 is further configured to determine a target outlet water temperature based on the actual outlet water temperature within the first preset time period; the fan control device 130 is further configured to control the operation of the variable frequency fan 140 based on the target outlet water temperature.
The fan control device 130 may be an integrated circuit chip, and has signal processing capability. The fan control device 130 may be a general-purpose Processor, including a Central Processing Unit (CPU), a Network Processor (NP), and the like; but also 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. The various methods, steps and logic blocks disclosed in the embodiments of the present invention may be implemented or performed. The general purpose processor may be a microprocessor or the fan control device 130 may be any conventional processor or the like.
The components and structure of the cooling tower fan energy-saving control system 100 shown in fig. 4 are only exemplary and not limiting, and the cooling tower fan energy-saving control system 100 may have other components and structures as needed.
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.
The function and effect of the fan control device 130 provided in the embodiment of the present application are the same as those of the foregoing method embodiment, and for a brief description, reference may be made to corresponding contents in the foregoing method embodiment for a part not mentioned in the embodiment of the device.
Third embodiment
The embodiment of the present application further provides a non-volatile computer-readable storage medium (hereinafter, referred to as a storage medium), on which a computer program is stored, where the computer program is executed by a processor (for example, the fan control device 130) to perform the steps of the cooling tower fan energy saving control method as described in fig. 1. For specific implementation, reference may be made to the method embodiment, which is not described herein again.
Specifically, the storage medium can be a general-purpose storage medium, such as a removable disk, a hard disk, or the like, and when the program code on the storage medium is executed, the energy saving control method for the cooling tower fan shown in the above embodiment can be executed.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, functional modules in the embodiments of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a notebook computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. The energy-saving control method for the cooling tower fan is characterized by being applied to a cooling tower, wherein the cooling tower is provided with a variable frequency fan; the method comprises the following steps:
acquiring the current actual outlet water temperature of the cooling tower;
judging whether the relation between the current actual outlet water temperature and the current set outlet water temperature meets a preset condition or not;
when the preset condition is met, controlling the variable frequency fan to operate for a first preset time period based on a preset outlet water temperature, wherein the preset outlet water temperature is smaller than the current actual outlet water temperature;
acquiring the actual outlet water temperature of the cooling tower within the first preset time;
determining a target outlet water temperature based on the actual outlet water temperature within the first preset time period;
and controlling the operation of the variable frequency fan based on the target outlet water temperature.
2. The method of claim 1, wherein a water outlet of the cooling tower is provided with a temperature sensor, and the step of obtaining the current actual outlet water temperature of the cooling tower comprises the following steps:
acquiring the outlet water temperature monitored by the temperature sensor for multiple times within a second preset time according to a preset time interval;
and acquiring an average value of the outlet water temperatures, wherein the average value is the current actual outlet water temperature of the cooling tower.
3. The method of claim 2, wherein obtaining an average of a plurality of the outlet water temperatures comprises:
rejecting outliers in the plurality of outlet water temperatures;
and acquiring the average value of the outlet water temperatures after the abnormal values are eliminated.
4. The method of claim 1, wherein determining whether the relationship between the current actual leaving water temperature and the current set leaving water temperature satisfies a predetermined condition comprises:
and judging whether the absolute value of the difference value between the current actual outlet water temperature and the current set outlet water temperature is greater than a preset threshold value or not, and if so, representing that the preset condition is met.
5. The method according to any one of claims 1 to 4, wherein a water outlet of the cooling tower is provided with a temperature sensor, and the step of obtaining the actual outlet water temperature of the cooling tower within the first preset time period comprises the following steps:
acquiring the outlet water temperature monitored by the temperature sensor for multiple times within the first preset time according to a preset time interval;
and acquiring the average value of the water outlet temperatures within the first preset time, wherein the average value of the water outlet temperatures within the first preset time is the actual water outlet temperature.
6. The method of claim 5, wherein determining a target leaving water temperature based on the actual leaving water temperature for the first preset length of time comprises:
and taking the value obtained by multiplying the actual water outlet temperature within the first preset time with a preset deviation coefficient as the target water outlet temperature, wherein the preset deviation coefficient is more than 1 and less than 1.1.
7. The energy-saving control system for the cooling tower fan is characterized by being applied to a cooling tower and comprising a fan control device and a variable frequency fan connected with the fan control device;
the fan control device is used for acquiring the current actual outlet water temperature of the cooling tower;
the fan control device is also used for judging whether the relation between the current actual outlet water temperature and the current set outlet water temperature meets a preset condition or not;
the fan control device is further used for controlling the variable frequency fan to operate for a first preset time length based on a preset outlet water temperature when the preset condition is met, wherein the preset outlet water temperature is smaller than the current actual outlet water temperature;
the fan control device is also used for acquiring the actual outlet water temperature of the cooling tower within the first preset time;
the fan control device is also used for determining a target outlet water temperature based on the actual outlet water temperature within the first preset time;
the fan control device is also used for controlling the operation of the variable frequency fan based on the target outlet water temperature.
8. The energy-saving control system for the fan of the cooling tower as claimed in claim 7, further comprising a temperature sensor disposed at the water outlet of the cooling tower, wherein the fan control device is configured to: acquiring the outlet water temperature monitored by the temperature sensor for multiple times within a second preset time according to a preset time interval;
and acquiring an average value of the outlet water temperatures, wherein the average value is the current actual outlet water temperature of the cooling tower.
9. The cooling tower fan energy saving control system of claim 8, wherein the fan control device is further configured to: rejecting outliers in the plurality of outlet water temperatures;
and acquiring the average value of the outlet water temperatures after the abnormal values are eliminated.
10. The cooling tower fan energy saving control system of claim 7, wherein the fan control device is further configured to: and judging whether the absolute value of the difference value between the current actual outlet water temperature and the current set outlet water temperature is greater than a preset threshold value or not, and if so, representing that the preset condition is met.
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| CN110514026A (en) * | 2019-07-23 | 2019-11-29 | 江苏天晟节能科技有限公司 | Modularization industrial cooling tower control system and its working method |
| CN112857132B (en) * | 2021-01-07 | 2022-11-18 | 丁一 | Cooling tower, cooling tower detection control method, device, equipment and storage medium |
| CN113465441B (en) * | 2021-06-29 | 2022-10-28 | 青岛海尔空调电子有限公司 | Control method of cooling tower and storage medium |
| CN114877582A (en) * | 2022-05-26 | 2022-08-09 | 杰瑞石油天然气工程有限公司 | Temperature control method, device and system based on air cooling |
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