CN111076602A - Cooling tower fan control method and system - Google Patents
Cooling tower fan control method and system Download PDFInfo
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- CN111076602A CN111076602A CN201911421597.6A CN201911421597A CN111076602A CN 111076602 A CN111076602 A CN 111076602A CN 201911421597 A CN201911421597 A CN 201911421597A CN 111076602 A CN111076602 A CN 111076602A
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/20—Humidity
- F24F2110/22—Humidity of the outside air
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- Thermal Sciences (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The embodiment of the application provides a cooling tower fan control method and a cooling tower fan control system. According to the technical scheme, the change of weather condition influence parameters, namely the outdoor wet bulb temperature, is automatically tracked, the target value of the water outlet temperature of the cooling tower is calibrated in real time according to weather conditions, so that the target value of the water outlet temperature is close to the limit cooling capacity of the cooling tower at the current wet bulb temperature, and then the rotating speed of a fan of the cooling tower is controlled according to the target value of the water outlet temperature, so that the cooling tower can exert the maximum cooling capacity, the temperature of cooling water is reduced, and the energy efficiency ratio of a cooling unit is improved.
Description
Technical Field
The embodiment of the application relates to the technical field of air conditioners, in particular to a cooling tower fan control method and system.
Background
The temperature of the cooling water in the air-conditioning cooling water system affects the energy consumption of the cooling unit. In order to control the temperature of the cooling water within a certain range, the air-conditioning cooling water system controls the temperature of the cooling water by controlling the fan frequency of the cooling tower according to the requirement. At present, the main control modes are as follows: the target value of the outlet water temperature of the cooling tower is set artificially, a controller in the air-conditioning cooling water system modulates the frequency of a fan of the cooling tower according to the target value of the outlet water temperature, and the cooling water temperature is controlled at the set target value of the outlet water temperature so as to meet the requirement of a water chiller on the cooling water temperature.
However, in this control method, the target value of the outlet water temperature of the cooling tower is set and changed empirically, and is highly dependent on workers and is prone to deviation. In addition, the target value of the outlet water temperature of the cooling tower can be influenced by different meteorological conditions, and the high-frequency operation of a fan of the cooling tower can be caused due to the unreasonable set temperature in certain scenes, so that the electric energy waste is caused. For example, in the case of a high humidity in summer, if the temperature setting value is not adjusted, the cooling tower fan still operates at a high frequency, which causes electric energy waste; for example, in a case where the water temperature is relatively low such as cloudy or rainy, if the temperature setting value is not adjusted, the fan may be operated excessively, which may result in waste of electric energy.
Disclosure of Invention
In view of the above, an embodiment of the present disclosure provides a method and a system for controlling a cooling tower fan to overcome a problem of power waste caused by high frequency operation of the cooling fan due to an unreasonable target value of a cooling tower outlet water temperature in the related art.
In a first aspect, an embodiment of the present application provides a cooling tower fan control method, which includes:
acquiring the outdoor wet bulb temperature outside the cooling tower;
determining a target value of the outlet water temperature of the cooling tower according to the outdoor wet bulb temperature;
and controlling the rotating speed of a fan of the cooling tower in the cooling tower according to the water outlet temperature target value.
Optionally, in an embodiment of the present application, the cooling tower fan control method further includes:
acquiring the water outlet temperature of a water supply pipeline of the cooling tower;
and controlling the rotating speed of the fan of the cooling tower according to the target value of the water outlet temperature and the water outlet temperature obtained from the temperature sensor.
Optionally, in an embodiment of the present application, the controlling the rotation speed of the cooling tower fan in the cooling tower according to the target value of the outlet water temperature includes:
when the target value of the water outlet temperature is higher than the water outlet temperature, controlling the rotating speed of the fan of the cooling tower to be reduced;
and when the target value of the water outlet temperature is lower than the water outlet temperature, controlling the rotation speed of the fan of the cooling tower to increase.
Optionally, in an embodiment of the present application, the determining a target value of the outlet water temperature of the cooling tower according to the outdoor wet bulb temperature includes:
and when the outdoor wet bulb temperature is higher than a first preset temperature, setting the sum of the outdoor wet bulb temperature and the corresponding approach value as the target value of the outlet water temperature.
Optionally, in an embodiment of the present application, the first preset temperature is 7 ℃.
Optionally, in an embodiment of the present application, the determining a target value of the outlet water temperature of the cooling tower according to the outdoor wet bulb temperature includes:
and when the outdoor wet bulb temperature is less than or equal to a second preset temperature, setting the target value of the outlet water temperature to be 11 ℃.
Optionally, in an embodiment of the present application, the cooling tower fan control method further includes:
detecting the operation of a user on an input device to obtain input information;
and determining the approximability value according to the input information.
Optionally, in an embodiment of the present application, the cooling tower fan control method further includes:
and determining the approximation value according to the mapping relation between the wet bulb temperature and the approximation value and the outdoor wet bulb temperature.
Optionally, in an embodiment of the present application, the controlling the rotation speed of the cooling tower fan in the cooling tower according to the target value of the outlet water temperature includes:
and controlling the rotating speed of the fan of the cooling tower by controlling the operating frequency of a fan frequency converter electrically connected with the fan of the cooling tower according to the outlet water temperature.
In a second aspect, an embodiment of the present application provides a cooling tower fan control system, which includes: the system comprises a controller, an outdoor temperature and humidity sensor and a cooling tower;
the controller is electrically connected with the outdoor temperature and humidity sensor and the cooling tower fan in the cooling tower;
the outdoor temperature and humidity sensor is arranged outside the cooling tower and used for detecting the outdoor wet bulb temperature outside the cooling tower;
the controller is used for determining a target value of the outlet water temperature of the cooling tower according to the outdoor wet bulb temperature obtained from the outdoor temperature and humidity sensor, and controlling the rotating speed of the fan of the cooling tower according to the target value of the outlet water temperature.
The embodiment of the application provides a cooling tower fan control method and a system, wherein the cooling tower fan control method comprises the following steps: the method comprises the steps of obtaining the outdoor wet bulb temperature outside the cooling tower, determining the target value of the outlet water temperature of the cooling tower according to the outdoor wet bulb temperature, and controlling the rotating speed of a fan of the cooling tower in the cooling tower according to the target value of the outlet water temperature. According to the technical scheme, the change of weather condition influence parameters, namely the outdoor wet bulb temperature, is automatically tracked, the target value of the water outlet temperature of the cooling tower is calibrated in real time according to weather conditions, so that the target value of the water outlet temperature is close to the limit cooling capacity of the cooling tower at the current wet bulb temperature, and then the rotating speed of a fan of the cooling tower is controlled according to the target value of the water outlet temperature, so that the cooling tower can exert the maximum cooling capacity, the temperature of cooling water is reduced, and the energy efficiency ratio of a cooling unit is improved.
Drawings
Fig. 1 is a schematic structural diagram of a cooling tower fan control system according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a controller according to an embodiment of the present application;
FIG. 3 is a graph illustrating a mapping relationship between an approximation value and an outdoor wet bulb temperature according to an embodiment of the present disclosure;
fig. 4 is a schematic flowchart of a cooling tower fan control method according to an embodiment of the present disclosure.
Description of the reference symbols
1: controller
2: outdoor temperature and humidity sensor
3: cooling tower
4: cooling tower fan
5: fan frequency converter
6: temperature sensor
7: spraying device
8: water collecting device
Detailed description of the invention
The cooling tower fan control system provided by the embodiment of the application is described in detail below with reference to the accompanying drawings and specific embodiments. Features in the following embodiments may be combined with each other without conflict.
Example one
Fig. 1 is a schematic structural diagram of a cooling tower fan control system according to an embodiment of the present disclosure. As shown in fig. 1, the cooling tower fan control system of the present embodiment may include: the system comprises a controller 1, an outdoor temperature and humidity sensor 2 and a cooling tower 3. The controller 1 is electrically connected with the outdoor temperature and humidity sensor 2, and the controller 1 is electrically connected with a cooling tower fan 4 in the cooling tower 3. The outdoor temperature and humidity sensor 2 is disposed outside the cooling tower 3 and is configured to detect an outdoor wet bulb temperature outside the cooling tower 3. The controller 1 is configured to determine a target outlet water temperature value of the cooling tower 3 according to the outdoor wet bulb temperature obtained from the outdoor temperature and humidity sensor 2, and control a rotation speed of the cooling tower fan 4 according to the target outlet water temperature value.
Fig. 2 is a schematic structural diagram of a controller of a cooling tower fan control system according to an embodiment of the present disclosure. As shown in fig. 2, the controller 1 further includes a rotation speed control module 11, a first temperature setting module 12, and a second temperature setting module 13, where the rotation speed control module 11 is electrically connected to the cooling tower fan 4, and is configured to control the rotation speed of the fan to decrease when the target value of the outlet water temperature is greater than the outlet water temperature; and when the target value of the water outlet temperature is smaller than the water outlet temperature, controlling the rotation speed of the fan to rise. The first temperature setting module 12 is electrically connected to the outdoor temperature and humidity sensor 2, and is configured to set a sum of the outdoor wet bulb temperature and a corresponding approach value as the target outlet water temperature value when the outdoor wet bulb temperature is greater than a first preset temperature, where the first preset temperature is 7 ℃. The second temperature setting module 13 is electrically connected to the outdoor temperature and humidity sensor 2, and is configured to set a sum of the outdoor wet bulb temperature and a corresponding approach value as the target outlet water temperature value when the outdoor wet bulb temperature is greater than a first preset temperature, where the first preset temperature is 7 ℃.
In the embodiment of the present application, the cooling tower fan 4 may be installed on the top of the cooling tower 3, and the cooling tower fan 4 mainly functions to accelerate the flow of air in the cooling tower 3, accelerate the heat exchange between air and water, and take away heat.
Alternatively, in some embodiments of the present application, the cooling tower fan 4 may be an axial flow fan.
Optionally, in an embodiment of the present application, the cooling tower fan control system further includes a fan frequency converter 5, the fan frequency converter 5 is electrically connected to the controller 1 and the cooling tower fan 4, and the controller 1 is configured to control the rotation speed of the cooling tower fan 4 by controlling the operating frequency of the fan frequency converter 5.
It should be understood that the fan inverter 5 is used to control the rotation speed of the cooling tower fan 4, and when the operation frequency of the fan inverter 5 is increased, the rotation speed of the cooling tower fan 4 is increased, and the faster the air flow speed in the cooling tower 3 is, the cooling effect is increased. When the operating frequency of the fan frequency converter 5 is reduced, the rotating speed of the cooling tower fan 4 is reduced, the flowing speed of air in the cooling tower 3 is reduced, and the cooling effect is reduced.
In the embodiment of the present application, the outdoor temperature and humidity sensor 2 may be disposed outside the cooling tower 3, for example, beside the cooling tower 3, and be configured to detect the outdoor wet bulb temperature outside the cooling tower 3 in real time, and record the outdoor wet bulb temperature detected in real time. The outdoor wet bulb temperature is one of the important parameters of a cooling tower and represents the limit temperature to which water can theoretically be cooled in the cooling tower. The outdoor wet bulb temperature changes along with the change of time and climate. As a collection method of the outdoor wet bulb temperature, for example, the outdoor temperature and the relative humidity may be obtained by an outdoor temperature and humidity sensor, and then the outdoor wet bulb temperature is determined according to the obtained outdoor temperature and relative humidity.
In the embodiment of the application, outdoor temperature and humidity sensor can detect the outdoor wet bulb temperature outside the cooling tower at the outside of the cooling tower, namely can be with the automatic tracking meteorological condition, the controller calibrates the leaving water temperature target value of the cooling tower according to the meteorological condition that outdoor temperature and humidity sensor provided, make leaving water temperature target value be close to the limit cooling capacity under the different wet bulb temperatures of cooling tower, then the controller controls the rotational speed of cooling tower fan 4 in the cooling tower according to this leaving water temperature target value, the flow of air in the cooling tower is accelerated, make the cooling tower exert the maximum cooling capacity, reduce the cooling water temperature, improve the cooling unit energy efficiency ratio.
Optionally, in an embodiment of the present application, the controller 1 is configured to set a sum of the outdoor wet bulb temperature and the corresponding approximation value as the outlet water temperature target value when the outdoor wet bulb temperature is greater than the first preset temperature.
In particular, in some application scenarios requiring continuous cooling throughout the year, the cooling tower needs to operate in different control modes. For example, in a data center application scenario, the refrigeration system may operate in a winter operating mode, a transitional season operating mode, or a summer operating mode. When the outdoor wet bulb temperature is higher than the first preset temperature, namely the refrigeration system operates in a transition season operation mode or a summer operation mode, under the two operation modes, the sum of the outdoor wet bulb temperature and the corresponding approach value can be set as a cooling tower outlet water temperature target value, and when the outdoor wet bulb temperature is lower than the first preset temperature, namely the winter operation mode, under the operation mode, the cooling tower outlet water temperature target value can be determined by setting a second preset temperature.
It should be understood that the approximation value is the difference between the outlet water temperature of the cooling tower and the wet bulb temperature, and in practice, the outlet water temperature of the cooling tower is always higher than the outdoor wet bulb temperature due to the limited heat exchange area of the packing of the cooling tower 3, and the like. There is a correspondence between the outdoor wet bulb temperature and the proximity value. The corresponding proximity value may refer to a proximity value under the current outdoor wet bulb temperature condition. Fig. 3 is a mapping relationship diagram of outdoor wet bulb temperature and degree of approximation value provided in the embodiment of the present application. As shown in fig. 3, the approach values are significantly different in the case of different outdoor wet bulb temperatures. As the outdoor wet bulb temperature increases, the approach value decreases. Generally, in the case of high humidity in summer, the approximation value may be 3 ℃ to 4 ℃. The approximation value is not a fixed value, and in the practical application process, the approximation value can be selected according to the approximation values of the cooling tower given by a manufacturer under different working conditions. The sum of the outdoor wet bulb temperature and the preset approximant value is set as the target value of the outlet water temperature, so that the target value of the outlet water temperature is close to the limit cooling capacity of the cooling tower at the current outdoor wet bulb temperature, and the cooling tower can exert the maximum cooling capacity.
In addition, the outdoor wet bulb temperature influences the outlet water temperature of the cooling tower, and the higher the outdoor wet bulb temperature is, the higher the lower limit outlet water temperature of the cooling tower is. When the wet bulb temperature is relatively high, for example, in a transition season or summer, the lower limit outlet water temperature of the cooling tower is relatively high, and in this case, if the target outlet water temperature value is set unreasonably, for example, set low, the cooling tower fan 4 will always run at full frequency, which results in waste of electric energy. Therefore, the current outdoor wet bulb temperature can be judged according to whether the outdoor wet bulb temperature is larger than the first preset temperature or not, and when the current outdoor wet bulb temperature is higher, the sum of the outdoor wet bulb temperature and the preset approximation value is set as the target value of the outlet water temperature, so that the electric energy can be saved more effectively, and the energy efficiency ratio of the cooling tower is improved.
Two implementation manners are listed below to describe how to obtain the preset approximant value, which, of course, is only an example and does not represent that the embodiment is limited thereto.
In an alternative embodiment, the cooling tower fan control system further comprises an input device electrically connected to the controller 1, and the approximation value is obtained by detecting a user operation by the input device.
In this implementation, for example, a user may refer to a database of the approach values under various operating conditions provided by a cooling tower manufacturer, and manually set the approach values according to the current outdoor wet bulb temperature, so that the user can flexibly set the approach values according to actual requirements.
In an optional implementation manner, the cooling tower fan control system further includes a storage device electrically connected to the controller 1, where the storage device stores a mapping relationship between the outdoor wet bulb temperature and an approximation value, and the preset approximation value is obtained by the controller 1 according to the outdoor wet bulb temperature and the mapping relationship.
The mapping relation between the outdoor wet bulb temperature and the approximation value can be set according to the approximation value under various working conditions provided by a manufacturer and stored in a storage device in advance, the controller 1 is electrically connected with the storage device, and when the controller is in actual use, the controller 1 can automatically capture and update the outdoor wet bulb temperature from the storage device according to the outdoor wet bulb temperature obtained from the outdoor temperature and humidity sensor 2. In the implementation mode, the cooling tower can automatically complete the setting of the target value of the outlet water temperature without human intervention, and the fully automatic operation is realized.
Optionally, the first preset temperature may be 7 ℃, and other temperature values may also be adopted according to actual needs, which is not limited in this embodiment.
Optionally, in another embodiment of the present application, the controller 1 is configured to set the target value of the outlet water temperature to 11 ℃ when the outdoor wet bulb temperature is less than or equal to the second preset temperature.
The second preset temperature may be the same as the first preset temperature, that is, the second preset temperature may be 7 ℃, or other temperature values may be adopted according to actual needs, which is not limited in this embodiment.
Specifically, when the outdoor wet bulb temperature is low, the refrigerating machine is not used for refrigerating, but the cooling water from the cooling tower directly cools the chilled water through the plate heat exchanger to provide a constant chilled water temperature requirement, so that free refrigeration is realized. At the moment, the water chilling unit is not started any more, and the requirement on cooling water does not need to be reduced to the limit temperature of the cooling tower, and the requirement that the outlet water temperature of the cooling water of the cooling tower reaches 11 ℃ can be calculated according to the temperature of 12 ℃ required by chilled water. Therefore, the target value of the outlet water temperature can be directly set to 11 ℃, and at the moment, the rotating speed of a fan of the cooling tower is low due to the low wet bulb temperature and is in a non-full-frequency state, so that the energy-saving operation is realized.
At this time, also taking the data center as an example, when the outdoor wet bulb temperature is less than or equal to the second preset temperature, the cooling tower may operate in a winter operation mode, and in this operation mode, the target value of the outlet water temperature may be directly set to 11 ℃, and the fan of the cooling tower is not full of frequency, so as to save energy.
In some embodiments of the present application, the cooling tower blower control system may further include a temperature sensor 6, and the temperature sensor 6 is disposed on the water supply pipeline of the cooling tower 3 for detecting the temperature of the outlet water of the cooling tower 3.
The controller 1 is electrically connected to the temperature sensor 6, and is configured to control the rotation speed of the cooling tower fan 4 according to the target value of the outlet water temperature and the outlet water temperature obtained from the temperature sensor 6.
Optionally, in an embodiment of the present application, the controller 1 is configured to control the rotation speed of the fan to decrease when the target value of the outlet water temperature is greater than the outlet water temperature; and when the target value of the water outlet temperature is lower than the water outlet temperature, controlling the rotation speed of the fan to increase. The controller obtains the water outlet temperature from the temperature sensor, compares the water outlet temperature with the determined water outlet temperature target value, and improves the accuracy of controlling the rotating speed of the fan of the cooling tower by introducing negative feedback.
Optionally, in an embodiment of the present application, the cooling tower fan control system may further include a spraying device 7 and a water collecting device 8, the spraying device 7 is disposed below the cooling tower fan 4, the water collecting device 8 is disposed below the spraying device 7, the spraying device 7 is communicated with a water return pipeline of the cooling tower 3, and the water supply pipeline is communicated with the water collecting device 8. Wherein, the spraying device 7 can comprise a plurality of nozzles spraying downwards, and the nozzles can be arranged side by side at intervals.
Specifically, spray set 7 sets up in the below of cooling tower fan 4, and spray set 7 can include a plurality of shower nozzle (not shown) that sprays downwards, and the shower nozzle can set up by the interval side by side, and the cooling water gets into spray set through the return water pipeline of cooling tower 4, carries out the filler in the cooling tower through the shower nozzle and sprays. A water collecting device 8 is arranged below the spraying device 7, the water collecting device 8 is communicated with one end of a water supply channel of the cooling tower, and cooling water in the water collecting device flows out through the water supply channel.
Fig. 4 is a schematic flowchart of a cooling tower control method according to an embodiment of the present application, where the cooling tower control method is executed by the cooling tower control apparatus shown in fig. 1. As shown in fig. 4, the cooling tower control method includes the steps of:
s401, acquiring the outdoor wet bulb temperature outside the cooling tower;
s402, determining a target value of the outlet water temperature of the cooling tower according to the outdoor wet bulb temperature;
and S403, controlling the rotating speed of a cooling tower fan in the cooling tower according to the target value of the water outlet temperature.
In the embodiment, the change of the weather condition influence parameter, namely the outdoor wet bulb temperature, is automatically tracked, the target value of the water outlet temperature of the cooling tower is calibrated in real time according to the weather condition, so that the target value of the water outlet temperature is close to the limit cooling capacity of the cooling tower at the current wet bulb temperature, and then the rotating speed of a fan of the cooling tower is controlled according to the target value of the water outlet temperature, so that the cooling tower exerts the maximum cooling capacity, the temperature of the cooling water is reduced, and the energy efficiency ratio of a cooling.
Optionally, in an embodiment of the present application, the cooling tower fan control method further includes:
acquiring the water outlet temperature of a water supply pipeline of the cooling tower;
and controlling the rotating speed of the fan of the cooling tower according to the target value of the outlet water temperature and the outlet water temperature obtained from the temperature sensor.
Optionally, in an embodiment of the present application, controlling a rotation speed of a cooling tower fan in the cooling tower according to the target value of the outlet water temperature includes:
when the target value of the water outlet temperature is higher than the water outlet temperature, controlling the rotating speed of the fan of the cooling tower to be reduced;
and when the target value of the water outlet temperature is lower than the water outlet temperature, controlling the rotation speed of the fan of the cooling tower to increase.
Optionally, in an embodiment of the present application, determining the target outlet water temperature value of the cooling tower according to the outdoor wet bulb temperature includes:
and when the outdoor wet bulb temperature is higher than the first preset temperature, setting the sum of the outdoor wet bulb temperature and the corresponding approximation value as a water outlet temperature target value.
Optionally, in an embodiment of the present application, the first preset temperature is 7 ℃.
Optionally, in an embodiment of the present application, determining the target outlet water temperature value of the cooling tower according to the outdoor wet bulb temperature includes:
and setting the target outlet water temperature value to be 11 ℃ when the outdoor wet bulb temperature is less than or equal to a second preset temperature.
Optionally, in an embodiment of the present application, the cooling tower fan control method further includes:
detecting the operation of a user on an input device to obtain input information;
determining an approximation value from the input information.
Optionally, in an embodiment of the present application, the cooling tower fan control method further includes:
and determining the approximation value according to the mapping relation between the wet bulb temperature and the approximation value and the outdoor wet bulb temperature.
Optionally, in an embodiment of the present application, controlling a rotation speed of a cooling tower fan in the cooling tower according to the target value of the outlet water temperature includes:
and controlling the rotating speed of the fan of the cooling tower by controlling the operating frequency of a fan frequency converter electrically connected with the fan of the cooling tower according to the water outlet temperature.
For convenience of understanding, the cooling tower fan control method provided in the embodiments of the present application is described in detail below with reference to specific embodiments.
Firstly, the controller 1 can obtain the outdoor wet bulb temperature from the outdoor temperature and humidity sensor 2;
then, the controller 1 can determine the target value of the outlet water temperature of the cooling tower 3 according to the outdoor wet bulb temperature, and control the rotating speed of the fan 4 of the cooling tower according to the target value of the outlet water temperature.
Optionally, the determining, by the controller 1, the target outlet water temperature value of the cooling tower 3 according to the outdoor wet bulb temperature may include: and when the outdoor wet bulb temperature is higher than the first preset temperature, setting the sum of the outdoor wet bulb temperature and the corresponding approximation value as a water outlet temperature target value.
Further, the first preset temperature may be 7 ℃.
Further, the approximation value may be obtained by detecting a user operation by an input device electrically connected to the controller 1.
Further, the approximation value may be obtained by the controller 1 from a storage device electrically connected to the controller 1 according to the outdoor wet bulb temperature, wherein the storage device stores a mapping relationship between the wet bulb temperature and the approximation value.
Optionally, the determining, by the controller 1, the target outlet water temperature value of the cooling tower 3 according to the outdoor wet bulb temperature may include: and setting the target outlet water temperature value to be 11 ℃ when the outdoor wet bulb temperature is less than or equal to a second preset temperature.
The second preset temperature may be the same as the first preset temperature, or may be lower than the first preset temperature. For example, when the first preset temperature may be 7 ℃, the second preset temperature may be 7 ℃ or less than 7 ℃.
Optionally, the controller 1 controls the rotation speed of the cooling tower fan according to the target value of the outlet water temperature, and may include: the controller 1 controls the operation frequency of a fan frequency converter 5 connected with a fan 4 of the cooling tower according to the target value of the water outlet temperature, and controls the rotating speed of the fan 4 of the cooling tower by controlling the operation frequency of the fan frequency converter 5.
Optionally, the controller 1 may further obtain the temperature of the outlet water of the cooling tower 3 from a temperature sensor 6, and the temperature sensor 6 may be disposed on the water supply pipeline of the cooling tower 3;
then, the controller 1 controls the rotation speed of the cooling tower fan 4 according to the outlet water temperature target value and the outlet water temperature acquired from the temperature sensor 6.
Optionally, controlling the rotation speed of the cooling tower fan 4 according to the target value of the outlet water temperature and the outlet water temperature obtained from the temperature sensor 6 may include: when the target value of the water outlet temperature is higher than the water outlet temperature, controlling the rotating speed of the fan to be reduced; and when the target value of the water outlet temperature is lower than the water outlet temperature, controlling the rotation speed of the fan to increase.
Based on the cooling tower control method, the cooling tower fan control system automatically tracks and collects the outdoor wet bulb temperature according to the outdoor temperature and humidity sensor, calibrates the outlet water temperature target value of the cooling tower in real time to enable the outlet water temperature target value to be close to the limit cooling capacity of the cooling tower at the current wet bulb temperature, and then controls the rotating speed of the cooling tower fan according to the outlet water temperature target value to enable the cooling tower to exert the maximum cooling capacity, reduce the temperature of cooling water and improve the energy efficiency ratio of a cooling unit.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. All changes, equivalents, modifications and the like which come within the spirit and principles of this application are intended to be included within the scope of the claims which follow.
Claims (10)
1. A cooling tower fan control method is characterized by comprising the following steps:
acquiring the outdoor wet bulb temperature outside the cooling tower;
determining a target value of the outlet water temperature of the cooling tower according to the outdoor wet bulb temperature;
and controlling the rotating speed of a fan of the cooling tower in the cooling tower according to the water outlet temperature target value.
2. The method of claim 1, further comprising:
acquiring the water outlet temperature of a water supply pipeline of the cooling tower;
and controlling the rotating speed of the fan of the cooling tower according to the target value of the water outlet temperature and the water outlet temperature obtained from the temperature sensor.
3. The method of claim 2, wherein said controlling a rotational speed of a cooling tower fan within the cooling tower as a function of the target outlet water temperature comprises:
when the target value of the water outlet temperature is higher than the water outlet temperature, controlling the rotating speed of the fan of the cooling tower to be reduced;
and when the target value of the water outlet temperature is lower than the water outlet temperature, controlling the rotation speed of the fan of the cooling tower to increase.
4. The method of claim 1, wherein determining a target cooling tower outlet water temperature from the outdoor wet bulb temperature comprises:
and when the outdoor wet bulb temperature is higher than a first preset temperature, setting the sum of the outdoor wet bulb temperature and the corresponding approach value as the target value of the outlet water temperature.
5. The method according to claim 4, wherein the first preset temperature is 7 ℃.
6. The method of claim 1, wherein determining a target cooling tower outlet water temperature from the outdoor wet bulb temperature comprises:
and when the outdoor wet bulb temperature is less than or equal to a second preset temperature, setting the target value of the outlet water temperature to be 11 ℃.
7. The method of claim 4, further comprising:
detecting the operation of a user on an input device to obtain input information;
and determining the approximability value according to the input information.
8. The method of claim 4, further comprising:
and determining the approximation value according to the mapping relation between the wet bulb temperature and the approximation value and the outdoor wet bulb temperature.
9. The method of claim 1, wherein said controlling a rotational speed of a cooling tower fan within the cooling tower as a function of the target outlet water temperature comprises:
and controlling the rotating speed of the fan of the cooling tower by controlling the operating frequency of a fan frequency converter electrically connected with the fan of the cooling tower according to the outlet water temperature.
10. A cooling tower fan control system, comprising: the system comprises a controller, an outdoor temperature and humidity sensor and a cooling tower;
the controller is electrically connected with the outdoor temperature and humidity sensor and the cooling tower fan in the cooling tower;
the outdoor temperature and humidity sensor is arranged outside the cooling tower and used for detecting the outdoor wet bulb temperature outside the cooling tower;
the controller is used for determining a target value of the outlet water temperature of the cooling tower according to the outdoor wet bulb temperature obtained from the outdoor temperature and humidity sensor, and controlling the rotating speed of the fan of the cooling tower according to the target value of the outlet water temperature.
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| CN113375476A (en) * | 2021-06-25 | 2021-09-10 | 新奥数能科技有限公司 | Power control method and device for cooling tower fan group and computer equipment |
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| WO2022143757A1 (en) * | 2020-12-29 | 2022-07-07 | 昆山璟赫机电工程有限公司 | Operation control system and operation control method for ice machine cooling tower |
| CN116007078A (en) * | 2021-10-21 | 2023-04-25 | 中国移动通信集团设计院有限公司 | Method, device and equipment for acquiring operation parameters of refrigeration system |
| WO2023087848A1 (en) * | 2021-11-19 | 2023-05-25 | 青岛海尔空调电子有限公司 | Outdoor wet bulb temperature determination method, fan control method and electronic device |
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