CN112665443B - Cooling tower control method and system for central air-conditioning system - Google Patents
Cooling tower control method and system for central air-conditioning system Download PDFInfo
- Publication number
- CN112665443B CN112665443B CN202011565033.2A CN202011565033A CN112665443B CN 112665443 B CN112665443 B CN 112665443B CN 202011565033 A CN202011565033 A CN 202011565033A CN 112665443 B CN112665443 B CN 112665443B
- Authority
- CN
- China
- Prior art keywords
- cooling tower
- temperature
- cooling
- water
- preset
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Landscapes
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a cooling tower control method and system for a central air-conditioning system, and relates to the field of cooling water temperature control of refrigerating units. The method comprises the following steps: the method comprises the steps of obtaining a temperature difference value between the cooling water outlet temperature of the cooling tower and the outdoor wet bulb temperature according to a preset test method, setting a preset temperature value according to the acquired natural temperature and a temperature difference value, adjusting the fan speed of the cooling tower according to the preset temperature value, controlling the cooling tower through adjusting the fan speed of the cooling tower, enabling the refrigerating unit to exert the maximum refrigerating capacity, reducing the cooling tower outlet water temperature to the maximum extent, greatly improving the efficiency of the refrigerating unit, realizing the overall energy conservation and consumption reduction of the refrigerating machine room, and improving the overall refrigerating efficiency of the refrigerating machine room.
Description
Technical Field
The invention relates to the field of control of cooling water temperature of refrigerating units, in particular to a cooling tower control method and system for a central air-conditioning system.
Background
In the technical field of refrigerating units and cooling towers in the industry, a one-to-one or main pipe system (the number of running refrigerating units of the cooling tower is more than the number of running refrigerating units) cooling tower control method sets a fixed temperature value by referring to the rated cooling water inlet temperature of the used refrigerating unit, and controls the rotating speed of a cooling tower fan according to the fixed temperature value.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art and provides a cooling tower control method and system for a central air-conditioning system.
The technical scheme for solving the technical problems is as follows:
a cooling tower control method for a central air conditioning system, comprising:
s1, acquiring a temperature difference value between the outlet water temperature of cooling water of a cooling tower and the outdoor wet bulb temperature according to a preset test method;
s2, setting a preset temperature value according to the acquired natural temperature and the temperature difference value;
s3, adjusting the fan speed of the cooling tower according to the preset temperature value;
s4, controlling the cooling tower by adjusting the wind speed of a fan of the cooling tower;
and S5, periodically testing and correcting the preset temperature value according to the scaling condition of the cooling tower filler.
The beneficial effects of the invention are: according to the scheme, the temperature difference value between the cooling water outlet temperature of the cooling tower and the outdoor wet bulb temperature is obtained according to a preset test method, the preset temperature value is set according to the acquired natural temperature, the fan air speed of the cooling tower is adjusted according to the preset temperature value, good natural meteorological conditions are fully utilized, especially the initial and final cooling periods, night and early morning periods, the refrigerating unit directly determines the refrigerating capacity of the refrigerating unit due to the heat dissipation capacity of the cooling tower, so that the refrigerating unit exerts the maximum refrigerating capacity, the cooling tower outlet temperature is reduced to the maximum extent, the efficiency of the refrigerating unit is greatly improved, the integral energy saving and consumption reduction of the refrigerating machine room are realized, and the integral refrigerating efficiency of the refrigerating machine room is improved.
Further, the preset test method comprises the following steps: when one refrigerating unit corresponds to one cooling tower, the cooling tower is operated under the condition of full load of a fan, the outlet water temperature of cooling water of the cooling tower and the outdoor wet bulb temperature are recorded, and the difference value of the outlet water temperature and the outdoor wet bulb temperature is calculated.
The beneficial effect of adopting the further scheme is that: when a refrigerating unit corresponds to a cooling tower, the cooling tower runs under the condition that a fan is fully loaded, and the difference between the cooling water outlet temperature and the outdoor wet bulb temperature of the cooling tower is recorded and calculated, so that the working condition that the refrigerating unit corresponds to the cooling tower is adapted, and the corresponding temperature difference value is calculated according to the cooling capacity of the cooling tower.
Further, the preset test method further includes: when one refrigerating unit corresponds to a plurality of cooling towers, starting and operating the cooling towers in preset number;
and adjusting the preset number of cooling towers to operate under the condition of full load, respectively recording the outlet water temperature of the cooling water of the cooling towers and the outdoor wet bulb temperature after the operation for the preset time, and calculating the temperature difference value of the outlet water temperature and the outdoor wet bulb temperature.
The beneficial effect of adopting the above further scheme is: this scheme is when a refrigeration unit corresponds many cooling towers, open and operate the cooling tower of predetermineeing quantity, the cooling tower of predetermineeing quantity all adjusts the operation under the full load condition, the difference of the cooling water play water temperature of recording and calculating cooling tower and outdoor wet bulb temperature for adapt to the operating mode that a refrigeration unit corresponds many cooling towers, calculate corresponding difference value according to many cooling towers cooling capacity, use the full pipe of water-locator as the foundation to find the most cooling tower operation platform number that various refrigeration unit operation platforms number correspond through the test when adopting the master control multitower operation mode through the cooling tower. The temperature of the outlet water of the cooling tower can be greatly reduced under the condition of not increasing the scaling tendency of the cooling tower.
Further, the method also comprises the following steps: and determining the preset number according to the number of the cooling towers which are in operation obtained according to the water flowing condition at the water distributor port of a plurality of the cooling towers which are in operation.
The beneficial effect of adopting the further scheme is that: the scheme confirms the preset quantity by the water flowing condition at the water distributor ports of a plurality of running cooling towers; the cooling tower that is not open when the cooling tower is the main control is more better, through the cooling tower of predetermineeing quantity, reduces cooling tower scale deposit speed, ensures that cooling tower cooling capacity does not descend.
Further, the S3 specifically includes: when the outlet water temperature of the cooling water of the cooling tower is higher than the preset temperature value, increasing the rotating speed of the fan of the cooling tower;
when the cooling water outlet temperature of the cooling tower is lower than the preset temperature value, reducing the rotating speed of the cooling tower fan until the cooling water outlet temperature of the cooling tower is equal to the preset temperature value, and stopping the cooling tower fan;
and when the outlet water temperature of the cooling water of the cooling tower is equal to the preset temperature value, keeping the rotating speed of the fan of the cooling tower unchanged.
The beneficial effect of adopting the further scheme is that: the scheme adjusts and adjusts the air speed of the fan of the cooling tower through the preset temperature value, realizes that the control of the cooling tower fully utilizes good natural meteorological conditions to reduce the water outlet temperature of the cooling tower to the maximum extent, thereby greatly improving the efficiency of the refrigerating unit and realizing the energy conservation and consumption reduction of the whole refrigerating machine room in a certain range.
Another technical solution of the present invention for solving the above technical problems is as follows:
a cooling tower control system for a central air conditioning system, comprising: the device comprises a temperature difference value acquisition module, a temperature value setting module, a wind speed adjusting module, a cooling tower control module and a temperature value correction module;
the temperature difference value acquisition module is used for acquiring the temperature difference value between the outlet water temperature of the cooling water of the cooling tower and the outdoor wet bulb temperature according to a preset test method;
the temperature value setting module is used for setting a preset temperature value according to the acquired natural temperature and a temperature difference value;
the wind speed adjusting module is used for adjusting the wind speed of the fan of the cooling tower according to the preset temperature value;
the cooling tower control module is used for controlling the cooling tower by adjusting the wind speed of a fan of the cooling tower;
and the temperature value correction module is used for periodically testing and correcting the preset temperature value according to the scaling condition of the cooling tower filler.
The invention has the beneficial effects that: according to the scheme, the temperature difference value between the cooling water outlet temperature of the cooling tower and the outdoor wet bulb temperature is obtained according to a preset test method, the preset temperature value is set according to the acquired natural temperature, the fan air speed of the cooling tower is adjusted according to the preset temperature value, good natural meteorological conditions are fully utilized, especially the initial and final cooling periods, night and early morning periods, the refrigerating unit directly determines the refrigerating capacity of the refrigerating unit due to the heat dissipation capacity of the cooling tower, so that the refrigerating unit exerts the maximum refrigerating capacity, the cooling tower outlet temperature is reduced to the maximum extent, the efficiency of the refrigerating unit is greatly improved, the integral energy saving and consumption reduction of the refrigerating machine room are realized, and the integral refrigerating efficiency of the refrigerating machine room is improved.
Further, the temperature difference obtaining module is specifically configured to, when one refrigeration unit corresponds to one cooling tower, operate the cooling tower under a full load condition of a fan, record a cooling water outlet temperature of the cooling tower and the outdoor wet bulb temperature, and calculate a difference between the cooling water outlet temperature and the outdoor wet bulb temperature.
The beneficial effect of adopting the above further scheme is: according to the scheme, when one refrigerating unit corresponds to one cooling tower, the cooling tower runs under the condition that a fan is fully loaded, the difference value between the cooling water outlet temperature and the outdoor wet bulb temperature of the cooling tower is recorded and calculated, the working condition that one refrigerating unit corresponds to one cooling tower is adapted, and the corresponding temperature difference value is calculated according to the cooling capacity of one cooling tower.
Further, the temperature difference value obtaining module is specifically configured to start and operate a preset number of cooling towers when one refrigerating unit corresponds to a plurality of cooling towers;
and adjusting the preset number of cooling towers to operate under the condition of full load, respectively recording the outlet water temperature of the cooling water of the cooling towers and the outdoor wet bulb temperature after the operation for the preset time, and calculating the temperature difference value of the outlet water temperature and the outdoor wet bulb temperature.
The beneficial effect of adopting the further scheme is that: this scheme is when a refrigeration unit corresponds many cooling towers, open and operate the cooling tower of predetermineeing quantity, the cooling tower of predetermineeing quantity all adjusts the operation under the full load condition, the difference of the cooling water play water temperature of recording and calculating cooling tower and outdoor wet bulb temperature for adapt to the operating mode that a refrigeration unit corresponds many cooling towers, calculate corresponding difference value according to many cooling towers cooling capacity, use the full pipe of water-locator as the foundation to find the most cooling tower operation platform number that various refrigeration unit operation platforms number correspond through the test when adopting the master control multitower operation mode through the cooling tower. The temperature of the outlet water of the cooling tower can be greatly reduced under the condition of not increasing the scaling tendency of the cooling tower.
Further, the temperature difference obtaining module is further configured to obtain the number of the cooling towers in operation according to the water distribution device port flowing conditions of the plurality of cooling towers in operation, so as to determine the preset number.
The beneficial effect of adopting the further scheme is that: the scheme confirms the preset quantity by the water flowing condition at the water distributor ports of a plurality of running cooling towers; the cooling tower that is not open when the cooling tower is the main control is more better, through the cooling tower of predetermineeing quantity, reduces cooling tower scale deposit speed, ensures that cooling tower cooling capacity does not descend.
Further, the wind speed adjusting module is specifically configured to increase the rotation speed of the cooling tower fan when the cooling water outlet temperature of the cooling tower is higher than the preset temperature value;
when the cooling water outlet temperature of the cooling tower is lower than the preset temperature value, reducing the rotating speed of the cooling tower fan until the cooling water outlet temperature of the cooling tower is equal to the preset temperature value, and stopping the cooling tower fan;
and when the outlet water temperature of the cooling water of the cooling tower is equal to the preset temperature value, keeping the rotating speed of the fan of the cooling tower unchanged.
The beneficial effect of adopting the further scheme is that: the scheme adjusts and adjusts the air speed of the fan of the cooling tower through the preset temperature value, realizes that the control of the cooling tower fully utilizes good natural meteorological conditions to reduce the water outlet temperature of the cooling tower to the maximum extent, thereby greatly improving the efficiency of the refrigerating unit and realizing the energy conservation and consumption reduction of the whole refrigerating machine room in a certain range.
Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a schematic flow chart illustrating a cooling tower control method for a central air conditioning system according to an embodiment of the present invention;
fig. 2 is a block diagram of a cooling tower control system for a central air conditioning system according to an embodiment of the present invention.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth to illustrate, but are not to be construed to limit the scope of the invention.
As shown in fig. 1, a method for controlling a cooling tower of a central air conditioning system according to an embodiment of the present invention includes:
s1, acquiring a temperature difference value between the outlet water temperature of cooling water of a cooling tower and the outdoor wet bulb temperature according to a preset test method;
it should be noted that, in one embodiment, the outdoor wet bulb temperature may be collected by a wet bulb temperature sensor with an electrical signal output, which is disposed at a suitable position around the outdoor refrigeration machine room, and the signal is transmitted to the central air conditioning control system. The installation position of the outdoor wet bulb temperature can be far away from the cooling tower at the periphery of the outdoor refrigeration machine room, preferably more than 20 meters, and other open places of heat dissipation equipment, such as the positions of lawns and the like in front of a plant.
In one embodiment, the outlet water temperature of the cooling water of the cooling tower can be acquired by a cooling water temperature sensor with an electric signal output and arranged at a water falling port of a cooling water pool or a water tray of the cooling tower, and the signal is transmitted to a control system.
The preset test method obtains a temperature difference value between the cooling water outlet temperature of the cooling tower and the outdoor wet bulb temperature, and in a certain embodiment, the temperature difference value may be:
when one refrigerating unit corresponds to one cooling tower: and recording the outlet water temperature of the cooling water of the cooling tower and the outdoor wet bulb temperature under the condition of full-load operation of the fan of the cooling tower, and calculating the difference value of the two temperatures.
In other embodiments, when one refrigerating unit corresponds to a plurality of cooling towers, that is, the main pipe, the obtaining the temperature difference value may include: firstly, opening cover plates on water distributors of all cooling towers, then 1, starting a refrigerating unit and a cooling tower to operate, slowly increasing the operation quantity of the cooling tower one by one, and carefully observing the running water distribution quantity of all the running cooling towers, particularly the running water condition of four corner water distributor openings far away from a water inlet of the cooling tower. The water level above the water distributors is continuously reduced along with the increase of the number of the cooling towers, and when more than one water distributors are observed to be not full of pipe flowing water, the cooling tower which is opened last is closed, and the number of the cooling towers which are in operation is the number of the cooling towers which can be opened at most by one refrigerating unit. And then all the running cooling tower fans are adjusted to power frequency running (namely full load running) for a certain time, and then the difference between the outlet water temperature of the cooling tower and the outdoor wet bulb temperature is recorded and calculated.
In other embodiments, when two refrigeration units and two cooling towers are started to operate, the number of the slow cooling tower operation is increased, and the water distribution of all the operating cooling towers, particularly the water flowing at the four corner water distributor ports far away from the water inlet of the cooling tower, is observed carefully. The water level above the water distributors is continuously reduced along with the increasing of the number of the cooling towers, when more than one water distributors are observed to be not full of pipe flowing water, the cooling tower which is opened last is closed, and the number of the cooling towers which are in operation at this time is the number of the cooling towers which can be opened at most by two refrigerating units. And then all the operating cooling tower fans are adjusted to power frequency operation, namely full load operation, and the difference between the outlet water temperature of the cooling tower and the outdoor wet bulb temperature is recorded and calculated after a certain time.
S2, setting a preset temperature value according to the acquired natural temperature and a temperature difference value; the natural temperature can be measured by a wet bulb temperature sensor arranged on the periphery of the outdoor refrigeration machine room.
S3, adjusting the fan speed of the cooling tower according to a preset temperature value;
in one embodiment, the speed of the cooling tower fan may be controlled based on the preset temperature value, for example, when the temperature of the cooling tower effluent is higher than the preset temperature value, the control system increases the speed of the cooling tower fan, otherwise, the speed of the cooling tower fan is decreased until the cooling tower fan is stopped, and when the temperature is close to the preset temperature value, the speed of the cooling tower fan is kept unchanged.
S4, controlling the cooling tower by adjusting the wind speed of a fan of the cooling tower;
in one embodiment, when the refrigeration process is that one refrigeration unit corresponds to one cooling tower, the control method may be: and adding the real-time wet bulb temperature value of the nature and the deviation value measured in the early stage as a set value to control the rotating speed of a fan of the cooling tower, so that the temperature of cooling water at a water falling port of the cooling tower is close to or equal to the set value.
In another embodiment, when the refrigeration process is a refrigeration unit corresponding to a plurality of cooling towers (header pipes), the control method may be: and 1, starting the cooling towers with the corresponding number according to the number of the running refrigeration units, namely, the number of the cooling towers which can be started at most measured in the early stage. And 2, adding the real-time wet bulb temperature value of the nature and the deviation value measured in the early stage as a set value to control the rotating speed of a fan of the cooling tower, so that the temperature of cooling water at a water falling port of the cooling tower is close to or equal to the set value. It should be noted that the sum of the real-time wet-bulb temperature value of the nature and the deviation value measured in the early stage is used as the set value to control the rotating speed of the fan of the cooling tower, and because the cooling effect of the cooling tower is closely related to the real-time dry-bulb temperature and the relative humidity of the nature, and the wet-bulb temperature can comprehensively reflect the changes of the two parameters, and the maximum cooling capacity of the cooling tower is the wet-bulb temperature of the current weather theoretically, the sum of the real-time wet-bulb temperature value and the deviation value measured in the early stage is used as the set value to control the rotating speed of the fan of the cooling tower.
And S5, periodically testing and correcting the preset temperature value according to the scaling condition of the cooling tower filler. It should be noted that S5 may be data obtained by performing test correction on the cooling tower again when the cooling tower fan is always in full-load operation and the cooling tower effluent temperature is higher than a set value by 0.5 ℃ because the cooling tower packing scaling condition is always changed.
According to the scheme, the temperature difference value between the cooling water outlet temperature of the cooling tower and the outdoor wet bulb temperature is obtained according to a preset test method, the preset temperature value is set according to the acquired natural temperature and the temperature difference value, the fan speed of the cooling tower is adjusted according to the preset temperature value, good natural meteorological conditions are fully utilized, especially the initial and final cooling time periods and the night and early morning time periods, the refrigerating unit directly determines the refrigerating capacity of the refrigerating unit due to the heat dissipation capacity of the cooling tower, so that the refrigerating unit exerts the maximum refrigerating capacity, the cooling tower outlet temperature is reduced to the maximum extent, the efficiency of the refrigerating unit is greatly improved, the integral energy saving and consumption reduction of the refrigerating machine room are realized, and the integral refrigerating efficiency of the refrigerating machine room is improved.
Preferably, in any of the above embodiments, the preset test method includes: when one refrigerating unit corresponds to one cooling tower, the cooling tower is operated under the condition of full load of a fan, the outlet water temperature of cooling water of the cooling tower and the outdoor wet bulb temperature are recorded, and the difference value of the outlet water temperature and the outdoor wet bulb temperature is calculated.
When a refrigerating unit corresponds to a cooling tower, the cooling tower is operated under the condition that a fan is fully loaded, and the difference between the cooling water outlet temperature and the outdoor wet bulb temperature of the cooling tower is recorded and calculated, so that the refrigerating unit is adapted to the working condition that the refrigerating unit corresponds to the cooling tower, and the corresponding temperature difference value is calculated according to the cooling capacity of the cooling tower.
Preferably, in any of the above embodiments, the preset test method further comprises: when one refrigerating unit corresponds to a plurality of cooling towers, starting and operating the cooling towers in preset number;
and adjusting a preset number of cooling towers to operate under the full-load condition, respectively recording the outlet water temperature of cooling water of the cooling towers and the outdoor wet bulb temperature after the cooling towers operate for a preset time, and calculating the temperature difference value of the outlet water temperature and the outdoor wet bulb temperature. Wherein the preset time can be 1 hour after the temperature of the outlet water of the cooling tower stops dropping and is basically stable.
This scheme is when a refrigeration unit corresponds many cooling towers, open and operate the cooling tower of predetermineeing quantity, the cooling tower of predetermineeing quantity all adjusts the operation under the full load condition, the difference of the cooling water play water temperature of recording and calculating cooling tower and outdoor wet bulb temperature for adapt to the operating mode that a refrigeration unit corresponds many cooling towers, calculate corresponding difference value according to many cooling towers cooling capacity, use the full pipe of water-locator as the foundation to find the most cooling tower operation platform number that various refrigeration unit operation platforms number correspond through the test when adopting the master control multitower operation mode through the cooling tower. The temperature of the outlet water of the cooling tower can be greatly reduced under the condition of not increasing the scaling tendency of the cooling tower.
Preferably, in any of the above embodiments, further comprising: the preset number is determined by obtaining the number of the cooling towers in operation according to the water flowing condition at the water distributor openings of the plurality of operating cooling towers.
In an embodiment, obtaining the preset number may be obtained by: by starting a refrigerating unit and a cooling tower to operate, the number of the cooling tower to operate is slowly increased, and meanwhile, the running water distribution conditions of all the operating cooling tower water distributors, particularly the water flowing conditions of four corner water distributor openings far away from a water inlet of the cooling tower, are carefully observed. The water level above the water distributors is continuously reduced along with the increase of the number of the cooling towers, when more than one water distributors are observed to be not full of pipe flowing water, the last cooling tower which is opened is closed, the number of the cooling towers which are in operation is the largest number of the cooling towers which can be opened and operated by one refrigerating unit, the largest number of the cooling towers which can be opened and operated is the preset number, the data that the refrigerating units with different numbers can operate the largest number of the cooling towers can be found on the basis of ensuring that the cooling water distributors of the cooling towers are full of pipe, and the difference value between the water outlet temperature of the cooling towers with the number of the operation of the cooling towers and the outdoor wet bulb temperature is calculated.
In one embodiment, when the flowing water condition of the water distributors is not full of the pipes, the scaling tendency of the packing of the cooling tower is increased, meanwhile, because the flowing water of some water distributors is not full of the pipes or even has no water, the flow rate of the cooling water among the packing of the cooling tower below the water distributors is reduced or even has no water, and further, the wind speed among the part of the packing of the cooling tower is obviously increased, the flow rate of the cooling water among the packing is reduced, so that the wind resistance is reduced, the wind inlet amount of the region with normal flow rate of the cooling water among the packing is obviously reduced, the wind enters the cooling tower from the place with low resistance, and the cooling capacity of the cooling tower is obviously reduced. Therefore, the data that the refrigerating units with different running numbers can run at most a plurality of cooling towers is found as the preset number of the cooling towers on the basis of ensuring that the cooling water distribution device of the cooling tower is full of cooling water obtained by the method, so that the problems that the scaling trend of the cooling tower is obviously increased on one hand, the regional air intake of the cooling tower with normal cooling water flow is reduced, the cooling water flow is reduced, even the regional air intake without water is increased, and the cooling effect and the cooling efficiency of the cooling tower are obviously reduced on the other hand can be solved.
It should be noted that, the more cooling towers that are not opened when the cooling tower is a main pipe system, the better the cooling tower, the number of running cooling towers is that the number of running cooling towers needs to be tested, and when the water distributor of the cooling tower is not a full pipe, the water distribution is uneven, the place with more water is more, or even the place without water is caused, especially when the flow speed of the cooling water on the filler of the cooling tower is reduced below a certain value, the scaling trend of the cooling tower is obviously accelerated, and the cooling capacity of the cooling tower is obviously reduced.
The scheme confirms the preset quantity by the water flowing condition at the water distributor ports of a plurality of running cooling towers; the cooling tower that is not open when the cooling tower is the main control is more better, through the cooling tower of predetermineeing quantity, reduces cooling tower scale deposit speed, ensures that cooling tower cooling capacity does not descend.
Preferably, in any of the above embodiments, S3 specifically includes: when the outlet water temperature of the cooling water of the cooling tower is higher than a preset temperature value, increasing the rotating speed of a fan of the cooling tower;
when the cooling water outlet temperature of the cooling tower is lower than a preset temperature value, reducing the rotating speed of a cooling tower fan until the cooling water outlet temperature of the cooling tower is equal to the preset temperature value, and stopping the cooling tower fan;
when the outlet water temperature of the cooling water of the cooling tower is equal to the preset temperature value, the rotating speed of the fan of the cooling tower is kept unchanged. In an embodiment, the method may further include, according to actual circumstances: when the outlet water temperature of the cooling water of the cooling tower is close to the preset temperature value, the rotating speed of the fan of the cooling tower is kept unchanged, and the close degree can be determined according to the allowed error in the practical application process.
The scheme adjusts and adjusts the air speed of the fan of the cooling tower through the preset temperature value, realizes that the control of the cooling tower fully utilizes good natural meteorological conditions to reduce the water outlet temperature of the cooling tower to the maximum extent, thereby greatly improving the efficiency of the refrigerating unit and realizing the energy conservation and consumption reduction of the whole refrigerating machine room in a certain range.
In one embodiment, as shown in fig. 2, a cooling tower control system for a central air conditioning system, the system comprising: the device comprises a temperature difference value acquisition module 11, a set temperature value module 12, a wind speed adjustment module 13, a cooling tower control module 14 and a temperature value correction module 15;
the temperature difference value acquisition module 11 is used for acquiring a temperature difference value between the outlet water temperature of the cooling water of the cooling tower and the outdoor wet bulb temperature according to a preset test method;
the temperature value setting module 12 is configured to set a preset temperature value according to the acquired natural temperature plus a temperature difference value;
the wind speed adjusting module 13 is used for adjusting the wind speed of the cooling tower fan according to a preset temperature value;
the cooling tower control module 14 is used for controlling the cooling tower by adjusting the wind speed of a fan of the cooling tower;
the temperature value correction module 15 is used for periodically testing and correcting the preset temperature value according to the scaling condition of the cooling tower filler.
According to the scheme, the temperature difference value between the cooling water outlet temperature of the cooling tower and the outdoor wet bulb temperature is obtained according to a preset test method, the preset temperature value is set according to the acquired natural temperature and the temperature difference value, the fan speed of the cooling tower is adjusted according to the preset temperature value, good natural meteorological conditions are fully utilized, especially the initial and final cooling time periods and the night and early morning time periods, the refrigerating unit directly determines the refrigerating capacity of the refrigerating unit due to the heat dissipation capacity of the cooling tower, so that the refrigerating unit exerts the maximum refrigerating capacity, the cooling tower outlet temperature is reduced to the maximum extent, the efficiency of the refrigerating unit is greatly improved, the integral energy saving and consumption reduction of the refrigerating machine room are realized, and the integral refrigerating efficiency of the refrigerating machine room is improved.
Preferably, in any of the above embodiments, the temperature difference obtaining module 11 is specifically configured to, when one refrigeration unit corresponds to one cooling tower, operate the cooling tower with the full fan, record the outlet water temperature of the cooling water and the outdoor wet bulb temperature of the cooling tower, and calculate the difference between the outlet water temperature and the outdoor wet bulb temperature.
When a refrigerating unit corresponds to a cooling tower, the cooling tower is operated under the condition that a fan is fully loaded, and the difference between the cooling water outlet temperature and the outdoor wet bulb temperature of the cooling tower is recorded and calculated, so that the refrigerating unit is adapted to the working condition that the refrigerating unit corresponds to the cooling tower, and the corresponding temperature difference value is calculated according to the cooling capacity of the cooling tower.
Preferably, in any of the above embodiments, the temperature difference obtaining module 11 is specifically configured to start and operate a preset number of cooling towers when one refrigerating unit corresponds to multiple cooling towers;
adjusting the preset number of cooling towers to operate under the condition of full load, respectively recording the outlet water temperature of cooling water of the cooling towers and the outdoor wet bulb temperature after the operation for the preset time, and calculating the temperature difference value of the outlet water temperature and the outdoor wet bulb temperature.
This scheme is when a refrigeration unit corresponds many cooling towers, open and operate the cooling tower of predetermineeing quantity, the cooling tower of predetermineeing quantity all adjusts the operation under the full load condition, the difference of the cooling water play water temperature of recording and calculating cooling tower and outdoor wet bulb temperature for adapt to the operating mode that a refrigeration unit corresponds many cooling towers, calculate corresponding difference value according to many cooling towers cooling capacity, use the full pipe of water-locator as the foundation to find the most cooling tower operation platform number that various refrigeration unit operation platforms number correspond through the test when adopting the master control multitower operation mode through the cooling tower. The temperature of the outlet water of the cooling tower can be greatly reduced under the condition of not increasing the scaling tendency of the cooling tower.
Preferably, in any of the above embodiments, the temperature difference obtaining module 11 is further configured to obtain the number of the cooling towers in operation according to the water flowing conditions at the water distributor ports of the plurality of cooling towers in operation, so as to determine the preset number.
The scheme confirms the preset quantity by the water flowing condition at the water distributor ports of a plurality of running cooling towers; the cooling tower that is not open when the cooling tower is the main control is more better, through the cooling tower of predetermineeing quantity, reduces cooling tower scale deposit speed, ensures that cooling tower cooling capacity does not descend.
Preferably, in any of the above embodiments, the wind speed adjusting module 13 is specifically configured to increase the rotation speed of the cooling tower fan when the outlet water temperature of the cooling water of the cooling tower is higher than a preset temperature value;
when the cooling water outlet temperature of the cooling tower is lower than a preset temperature value, reducing the rotating speed of a cooling tower fan until the cooling water outlet temperature of the cooling tower is equal to the preset temperature value, and stopping the cooling tower fan;
when the outlet water temperature of the cooling water of the cooling tower is equal to the preset temperature value, the rotating speed of the fan of the cooling tower is kept unchanged.
This scheme adjusts adjustment cooling tower fan wind speed through presetting the temperature value, thereby realizes the control make full use of the cooling tower good nature meteorological condition furthest's reduction cooling tower play water temperature by a wide margin promotion refrigerating unit efficiency, realize the whole energy saving and consumption reduction of certain range of refrigeration computer lab.
It is to be understood that some or all of the alternative implementations described above in various embodiments may be included in some embodiments.
It should be noted that the above embodiments are product embodiments corresponding to the previous method embodiments, and for the description of each optional implementation in the product embodiments, reference may be made to corresponding descriptions in the above method embodiments, and details are not described here again.
The reader should understand that in the description of this specification, reference to the description of the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described method embodiments are merely illustrative, and for example, the division of steps into only one type of logical functional division may be implemented in practice in other ways, for example, multiple steps may be combined or integrated into another step, or some features may be omitted, or not implemented.
The above method, if implemented in the form of software functional units 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 invention essentially or partially contributes to the prior art, or all or part of the technical solution can 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 server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. 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.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. A cooling tower control method for a central air conditioning system, comprising:
s1, obtaining a temperature difference value between the outlet water temperature of cooling water of a cooling tower and the outdoor wet bulb temperature according to a preset test method;
s2, setting a preset temperature value according to the acquired natural temperature and the temperature difference value;
s3, adjusting the rotating speed of a fan of the cooling tower according to the preset temperature value;
s4, controlling the cooling tower by adjusting the rotating speed of a fan of the cooling tower;
s5, periodically testing and correcting the preset temperature value according to the scaling condition of the cooling tower filler;
the preset test method comprises the following steps: when one refrigerating unit corresponds to a plurality of cooling towers, starting and operating the cooling towers in preset number;
adjusting the preset number of cooling towers to operate under the condition of full load, respectively recording the outlet water temperature of the cooling water of the cooling towers and the outdoor wet bulb temperature after the operation for preset time, and calculating the temperature difference value of the outlet water temperature and the outdoor wet bulb temperature;
the preset number is determined by obtaining the number of the cooling towers which are in operation according to the water flowing condition of the water distributors of a plurality of the cooling towers which are in operation, and the preset number is obtained by the following steps: the operation of a refrigerating unit and a cooling tower is started, then the operation quantity of the cooling tower is increased one by one, and simultaneously all the running water distributors of the cooling tower are observed, wherein the running water conditions of four corner water distributors far away from a water inlet of the cooling tower are included.
2. The cooling tower control method for a central air conditioning system according to claim 1, wherein the preset test method comprises: when one refrigerating unit corresponds to one cooling tower, the cooling tower is operated under the condition of full load of a fan, the outlet water temperature of cooling water of the cooling tower and the outdoor wet bulb temperature are recorded, and the difference value of the outlet water temperature and the outdoor wet bulb temperature is calculated.
3. The cooling tower control method for a central air conditioning system according to claim 1 or 2, wherein the S3 specifically comprises: when the outlet water temperature of the cooling water of the cooling tower is higher than the preset temperature value, increasing the rotating speed of a fan of the cooling tower;
when the cooling water outlet temperature of the cooling tower is lower than the preset temperature value, reducing the rotating speed of the cooling tower fan until the cooling water outlet temperature of the cooling tower is equal to the preset temperature value, and stopping the cooling tower fan;
and when the outlet water temperature of the cooling water of the cooling tower is equal to the preset temperature value, keeping the rotating speed of the fan of the cooling tower unchanged.
4. A cooling tower control system for a central air conditioning system, comprising: the device comprises a temperature difference value acquisition module, a temperature value setting module, a wind speed adjusting module, a cooling tower control module and a temperature value correction module;
the temperature difference value acquisition module is used for acquiring the temperature difference value between the outlet water temperature of the cooling water of the cooling tower and the outdoor wet bulb temperature according to a preset test method;
the temperature value setting module is used for setting a preset temperature value according to the acquired natural temperature and the temperature difference value;
the wind speed adjusting module is used for adjusting the rotating speed of a fan of the cooling tower according to the preset temperature value;
the cooling tower control module is used for controlling the cooling tower by adjusting the rotating speed of a cooling tower fan;
the temperature value correction module is used for periodically testing and correcting the preset temperature value according to the scaling condition of the cooling tower filler;
the temperature difference acquisition module is specifically used for starting and operating a preset number of cooling towers when one refrigerating unit corresponds to a plurality of cooling towers;
adjusting the preset number of cooling towers to operate under the condition of full load, respectively recording the outlet water temperature of the cooling water of the cooling towers and the outdoor wet bulb temperature after the operation for preset time, and calculating the temperature difference value of the outlet water temperature and the outdoor wet bulb temperature;
the temperature difference module is also used for obtaining the number of the cooling towers which are in operation according to the running water conditions of the water distributors of the plurality of the cooling towers which are in operation so as to determine the preset number; the preset number is obtained by the following method: the operation of a refrigerating unit and a cooling tower is started, then the operation quantity of the cooling tower is increased one by one, and simultaneously all the running water distributors of the cooling tower are observed, wherein the running water conditions of four corner water distributors far away from a water inlet of the cooling tower are included.
5. The cooling tower control system of claim 4, wherein the temperature difference obtaining module is specifically configured to operate a cooling tower with a fully loaded fan when one refrigeration unit corresponds to the cooling tower, record a cooling water outlet temperature of the cooling tower and the outdoor wet bulb temperature, and calculate a difference therebetween.
6. The cooling tower control system for a central air conditioning system according to claim 4 or 5, wherein the wind speed adjusting module is specifically configured to increase the rotation speed of the cooling tower fan when the cooling water outlet temperature of the cooling tower is higher than the preset temperature value;
when the cooling water outlet temperature of the cooling tower is lower than the preset temperature value, reducing the rotating speed of the cooling tower fan until the cooling water outlet temperature of the cooling tower is equal to the preset temperature value, and stopping the cooling tower fan;
and when the outlet water temperature of the cooling water of the cooling tower is equal to the preset temperature value, keeping the rotating speed of the fan of the cooling tower unchanged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011565033.2A CN112665443B (en) | 2020-12-25 | 2020-12-25 | Cooling tower control method and system for central air-conditioning system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011565033.2A CN112665443B (en) | 2020-12-25 | 2020-12-25 | Cooling tower control method and system for central air-conditioning system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112665443A CN112665443A (en) | 2021-04-16 |
| CN112665443B true CN112665443B (en) | 2022-11-25 |
Family
ID=75409368
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011565033.2A Active CN112665443B (en) | 2020-12-25 | 2020-12-25 | Cooling tower control method and system for central air-conditioning system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112665443B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113864977A (en) * | 2021-09-30 | 2021-12-31 | 珠海格力电器股份有限公司 | Cooling system, temperature control method and device thereof, equipment and air conditioning system |
| CN114199071B (en) * | 2021-10-29 | 2024-04-12 | 深圳市富能新能源科技有限公司 | Control method of refrigerating system, electronic equipment and computer readable storage medium |
| CN114087830A (en) * | 2021-11-17 | 2022-02-25 | 浙江晨浩智能科技有限公司 | Efficient and energy-saving industrial cooling water system and control method |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07218184A (en) * | 1994-02-01 | 1995-08-18 | Hitachi Metals Ltd | Cooling tower and controlling method therefor |
| CN202216363U (en) * | 2011-08-12 | 2012-05-09 | 东莞市中科机电安装工程有限公司 | Energy conservation control device of cooling water tower of central air conditioner |
| CN202216364U (en) * | 2011-08-15 | 2012-05-09 | 东莞市中科机电安装工程有限公司 | Intelligent network energy-saving control system for central air conditioner |
| JP6408972B2 (en) * | 2015-10-05 | 2018-10-17 | 日本エア・リキード株式会社 | Cooling tower control system and cooling tower control method |
| CN205079668U (en) * | 2015-10-19 | 2016-03-09 | 深圳市新环能科技有限公司 | Cooling tower energy -saving control system based on efficiency control |
| CN107806695B (en) * | 2016-08-29 | 2019-12-10 | 广东迪奥技术有限公司 | Energy-saving control device and method for air conditioner cooling water system |
| CN110411272B (en) * | 2019-08-29 | 2024-06-04 | 高晋柏 | Natural ventilation cooling tower with continuous cleaning function for thermal power plant and cleaning method |
| CN111947278B (en) * | 2020-08-07 | 2024-03-29 | 广州市设计院集团有限公司 | Cooling system and control method thereof |
-
2020
- 2020-12-25 CN CN202011565033.2A patent/CN112665443B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN112665443A (en) | 2021-04-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112665443B (en) | Cooling tower control method and system for central air-conditioning system | |
| CN106288197B (en) | A kind of air conditioning control method and its system based on pid algorithm | |
| CN102455093B (en) | Energy efficiency controlling method for refrigerating system | |
| CN202119050U (en) | Self-adaptive energy-saving control system of air conditioner of computer room | |
| CN104089362B (en) | A kind of central air conditioning cooling water system cooling effectiveness maximization method and control device | |
| CN107084477B (en) | Heating operation control method for air conditioner | |
| CN113819596B (en) | Air conditioner control method and air conditioner | |
| CN110895016A (en) | Fuzzy self-adaptive based energy-saving group control method for central air-conditioning system | |
| CN104713197A (en) | Central air conditioning system optimizing method and system based on mathematic model | |
| CN109253534A (en) | A kind of outer blower method for controlling number of revolution, equipment and computer can storage mediums | |
| WO2018188522A1 (en) | Air conditioner heating operation control method | |
| CN111947278B (en) | Cooling system and control method thereof | |
| CN110726219B (en) | Control method, device and system of air conditioner, storage medium and processor | |
| CN111076531B (en) | Control method of drying device, drying device and controller | |
| CN102384555A (en) | Full fresh air heat pump type constant temperature and constant humidity air conditioning system | |
| CN109237700B (en) | On-line variable water temperature control method for air-conditioning refrigerator | |
| CN202338977U (en) | All fresh air heat pump type constant temperature and humidity air conditioning system | |
| Aprile et al. | Modelling and control optimization of a solar desiccant and evaporative cooling system using an electrical heat pump | |
| CN111928428B (en) | Control method of air conditioning system considering demand response and refrigeration system | |
| CN204923216U (en) | Frequency conversion constant temperature and humidity laboratory precision air conditioning | |
| CN112199630B (en) | Multi-split operation performance evaluation calculation method in actual building | |
| CN113757856A (en) | Control method and device for air conditioner cooling water system | |
| CN114234669A (en) | Dry-wet combined cooling tower control system and working method | |
| Tao et al. | Adaptive energy saving monitoring technology for air condition in telecommunication equipment room | |
| CN113864999A (en) | Air conditioning system energy consumption prediction method and device and air conditioning system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |