CN111365834B - Control method of air conditioning system, and computer-readable storage medium - Google Patents
Control method of air conditioning system, and computer-readable storage medium Download PDFInfo
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- CN111365834B CN111365834B CN202010194527.8A CN202010194527A CN111365834B CN 111365834 B CN111365834 B CN 111365834B CN 202010194527 A CN202010194527 A CN 202010194527A CN 111365834 B CN111365834 B CN 111365834B
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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
- 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
- F28—HEAT EXCHANGE IN GENERAL
- F28C—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA COME INTO DIRECT CONTACT WITHOUT CHEMICAL INTERACTION
- F28C1/00—Direct-contact trickle coolers, e.g. cooling towers
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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
- F28F25/00—Component parts of trickle coolers
- F28F25/02—Component parts of trickle coolers for distributing, circulating, and accumulating liquid
- F28F25/08—Splashing boards or grids, e.g. for converting liquid sprays into liquid films; Elements or beds for increasing the area of the contact surface
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Abstract
The invention provides a control method of an air conditioning system, the air conditioning system and a computer readable storage medium. The control method of the air conditioning system comprises the following steps: obtaining the cooling water flow of a plurality of started cooling towers of an air conditioning system; and controlling the number of the started cooling towers and/or adjusting the cooling water flow of any started cooling tower according to the cooling water flows of the plurality of started cooling towers. According to the technical scheme, on one hand, the flow balance of the cooling tower under the condition of constant flow or variable flow is realized, the reduction of the heat dissipation efficiency of the cooling tower caused by the unbalance of the flow distribution of the cooling tower is avoided, and the control cost can be reduced because a static balance valve or a constant flow valve does not need to be additionally arranged. On the other hand, by controlling the number of the cooling towers which are opened, the heat dissipation area of the cooling towers can be utilized to the maximum extent, and the purposes of optimal heat dissipation and lowest power consumption are achieved.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control method of an air conditioning system, the air conditioning system and a computer readable storage medium.
Background
In the related art, a static balance valve or a constant flow valve is generally additionally arranged in a flow balance method among a plurality of parallel cooling towers of an air conditioning system. The static balance valve has lower manufacturing cost, but complex flow balance debugging is required to be carried out by professional staff by using a matched tool during debugging; the constant flow valve can set a fixed flow value when leaving a factory according to the rated flow requirement of the cooling tower, but the constant flow valve is easy to damage and block in cooling water with poor water quality due to the structural problem.
In addition, both of the above two methods are only suitable for constant flow control of cooling water, and cannot be applied to a variable flow cooling water system. In the variable-flow cooling water system, when a water pump is subjected to frequency conversion, the flow distribution of a cooling tower is unbalanced, so that the efficiency of the cooling tower is reduced, and the energy consumption of a cold machine is directly increased.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art or the related art.
To this end, an aspect of the present invention is to provide a control method of an air conditioning system.
Another aspect of the present invention is to provide an air conditioning system.
Yet another aspect of the present invention is directed to a computer-readable storage medium.
In view of the above, according to an aspect of the present invention, there is provided a control method of an air conditioning system, including: obtaining the cooling water flow of a plurality of started cooling towers of an air conditioning system; and controlling the number of the started cooling towers and/or adjusting the cooling water flow of any started cooling tower according to the cooling water flows of the plurality of started cooling towers.
In the control method of the air conditioning system provided by the invention, the air conditioning system comprises a plurality of cooling towers, the states of the cooling towers are opened or not opened, the total cooling water flow of all the opened cooling towers is obtained, the number of the opened cooling towers is controlled according to the total cooling water flow, and/or the cooling water flow of any opened cooling tower is adjusted. According to the technical scheme, on one hand, the flow balance of the cooling tower under the condition of constant flow or variable flow is realized, the reduction of the heat dissipation efficiency of the cooling tower caused by the unbalance of the flow distribution of the cooling tower is avoided, and the control cost can be reduced because a static balance valve or a constant flow valve does not need to be additionally arranged. On the other hand, by controlling the number of the cooling towers which are opened, the heat dissipation area of the cooling towers can be utilized to the maximum extent, and the purposes of optimal heat dissipation and lowest power consumption are achieved.
It should be noted that, when the cooling tower is opened, the valve on the cooling tower motor and the valve on the cooling tower water inlet pipe need to be opened at the same time, when the cooling tower is closed, the valve on the cooling tower motor and the valve on the cooling tower water inlet pipe need to be closed at the same time, and the opening degree of the valve on the cooling tower water inlet pipe is adjusted by adjusting the cooling water flow of any opened cooling tower.
The control method of the air conditioning system according to the present invention may further include the following technical features:
in the above technical solution, the step of controlling the number of started cooling towers and/or adjusting the flow of cooling water of any one started cooling tower according to the flow of cooling water of a plurality of started cooling towers specifically includes: calculating a first target flow according to the cooling water flows of the plurality of started cooling towers; and controlling the number of the started cooling towers and/or adjusting the flow rate of the cooling water of any started cooling tower according to the first target flow and the first flow threshold.
In the technical scheme, a first target flow is calculated according to the total cooling water flow of the started cooling towers, and further, the number of the started cooling towers is increased, reduced or kept and/or the cooling water flow of any started cooling tower is adjusted according to the size relation between the first target flow and a first flow threshold value, so that the heat dissipation area of the cooling tower is maximized, the flow balance of the cooling tower is ensured, and the heat dissipation efficiency of the cooling tower is prevented from being reduced.
The first flow rate threshold is determined according to a variable flow rate lower limit value of the cooling tower of the air conditioning system, for example, the first flow rate threshold is equal to the variable flow rate lower limit value × a, a is a coefficient, and the coefficient may be determined according to actual conditions, for example, a is equal to 0.9. The lower variable flow rate limit value can be set according to the cooling tower parameters.
In any of the above embodiments, the first target flow rate is an average value of the flow rates of the cooling water of the plurality of started cooling towers.
In the technical scheme, the first target flow is the average value of the cooling water flow of the plurality of started cooling towers, and the average flow conditions of all the started cooling towers can be accurately reflected. And can determine which cooling towers have cooling water flow above the average level and which cooling towers have cooling water flow below the average level.
In any of the above technical solutions, the step of controlling the number of started cooling towers according to the first target flow rate and the first flow rate threshold specifically includes: the first target flow rate is less than a first flow rate threshold, reducing the number of cooling towers that have been turned on.
In the technical scheme, when the first target flow is smaller than the first flow threshold, which indicates that the target flow (for example, average flow) of the cooling water flows of the plurality of started cooling towers is low, the number of the started cooling towers is reduced to increase the target flow, and it is ensured that the flow control target flow of the cooling towers is not lower than a certain lower limit value (i.e., the first flow threshold).
In any of the above technical solutions, the step of controlling the number of started cooling towers according to the first target flow rate and the first flow rate threshold specifically includes: the first target flow is larger than or equal to the first flow threshold, and a second target flow is calculated according to the cooling water flows of the plurality of started cooling towers; the second target flow is greater than the second flow threshold, increasing the number of cooling towers that have been turned on.
In the technical scheme, the first target flow is greater than or equal to the first flow threshold, which indicates that the target flow (for example, average flow) of the cooling water flows of the plurality of started cooling towers is not lower than a certain lower limit value (namely, the first flow threshold), at this time, the second target flow is calculated according to the cooling water flows of the plurality of started cooling towers, and when the second target flow is greater than the second flow threshold, the number of the started cooling towers is increased, so that the cooling towers are ensured to be started as much as possible, the heat dissipation area of the cooling tower filler is fully utilized, and the heat dissipation efficiency is improved.
The second flow rate threshold is determined according to a variable flow rate lower limit value of the cooling tower of the air conditioning system, for example, the second flow rate threshold is equal to the variable flow rate lower limit value × b, b is a coefficient, and the coefficient may be determined according to actual conditions, for example, b is equal to 1.1.
In any of the above-mentioned technical solutions,
wherein L isiThe cooling water flow of the cooling tower is started for the ith station, and n is the number of the cooling water flows of the started cooling tower, wherein i is 1, 2.
In the technical scheme, it is assumed that one more cooling tower is opened on the basis of the number of currently opened cooling towers, and the target flow rate after one more cooling tower is opened is calculated, that is, the average value of the flow rates of all the cooling towers after one more cooling tower is opened is calculated. If the average flow is greater than the second flow threshold, it indicates that the average flow is not below a lower limit (i.e., the second flow threshold), i.e., a cooling tower is allowed to be opened, then an unopened cooling tower is opened.
In any of the above technical solutions, the step of adjusting the flow rate of the cooling water of any started cooling tower according to the first target flow rate and the first flow rate threshold specifically includes: the first target flow is greater than or equal to a first flow threshold value, the second target flow is less than or equal to a second flow threshold value, for any opened cooling tower, the first target flow is greater than or equal to the cooling water flow of the opened cooling tower, and the opening degree of a valve corresponding to the opened cooling tower is increased so as to increase the cooling water flow of the opened cooling tower; the first target flow is smaller than the cooling water flow of the opened cooling tower, and the opening degree of a valve corresponding to the opened cooling tower is reduced so as to reduce the cooling water flow of the opened cooling tower.
In the technical scheme, the first target flow is greater than or equal to the first flow threshold, and the second target flow is less than or equal to the second flow threshold, which indicates that if the average value of the flows of all the cooling towers after one more cooling tower is started is lower than a certain lower limit value (i.e. the second flow threshold), the number of the currently started cooling towers is kept unchanged, and the flow of the cooling water of the started cooling towers is adjusted. Specifically, for any cooling tower, if the current cooling water flow of the cooling tower is smaller than a first target flow, the opening degree of a valve corresponding to the opened cooling tower is increased to increase the cooling water flow of the opened cooling tower; if the current cooling water flow of the cooling tower is larger than or equal to the first target flow, the opening degree of a valve corresponding to the opened cooling tower is reduced so as to reduce the cooling water flow of the opened cooling tower, ensure the flow balance of the cooling tower and avoid the reduction of the cooling efficiency of the cooling tower caused by the flow distribution unbalance of the cooling tower.
In any of the above technical solutions, before the step of reducing the number of started cooling towers, the method further includes: judging whether the number of the started cooling towers is larger than a first number threshold value or not; and the number of the opened cooling towers is larger than the first number threshold value, and the step of reducing the number of the opened cooling towers is carried out.
In the technical scheme, before the number of the opened cooling towers is controlled to be reduced, whether the number of the opened cooling towers can be reduced or not needs to be determined, and when the number of the opened cooling towers is smaller than or equal to a first number threshold value, the number is kept unchanged, so that the problem that the air-conditioning system cannot normally run due to the fact that the number of the closed cooling towers is too large or all the closed cooling towers are avoided; if the number of the opened cooling towers is larger than the first number threshold, the number can be reduced, and the flow control target flow of the cooling towers is not lower than a certain lower limit value.
In any of the above technical solutions, before the step of increasing the number of started cooling towers, the method further includes: judging whether the number of the opened cooling towers is smaller than a second number threshold value or not; and the number of the opened cooling towers is less than the second number threshold value, and the step of increasing the number of the opened cooling towers is carried out.
In the technical scheme, before controlling and increasing the number of the started cooling towers, whether the number of the started cooling towers can be increased or not needs to be determined, and when the number of the started cooling towers is greater than or equal to a second number threshold value, which indicates that the number of the started cooling towers reaches an upper limit, the number is kept unchanged; if the number of the started cooling towers is smaller than the second number threshold, the number can be increased, the cooling towers can be started as much as possible, so that the heat dissipation area of the cooling tower filler is fully utilized, and the heat dissipation efficiency is improved.
According to another aspect of the present invention, there is provided an air conditioning system including: a plurality of cooling towers; any one of the flow detection devices is connected with the cooling tower, and the flow detection devices detect the flow of cooling water corresponding to the cooling tower; a memory storing a computer program; and the controller is connected with the flow detection device and the memory, and when the controller executes a computer program, the control method of the air conditioning system in any technical scheme is realized.
The air conditioning system provided by the invention comprises a plurality of cooling towers, a plurality of flow detection devices, a plurality of valves, a memory and a controller, wherein the flow detection devices and the valves are arranged on the water inlet pipe on each cooling tower. When the cooling tower is started, the flow detection device detects the cooling water flow, and the controller controls the number of the started cooling towers and/or adjusts the cooling water flow of any started cooling tower according to the total cooling water flow of the started cooling towers. According to the technical scheme, on one hand, the flow balance of the cooling tower under the condition of constant flow or variable flow is realized, the reduction of the heat dissipation efficiency of the cooling tower caused by the unbalance of the flow distribution of the cooling tower is avoided, and the control cost can be reduced because a static balance valve or a constant flow valve does not need to be additionally arranged. On the other hand, by controlling the number of the cooling towers which are opened, the heat dissipation area of the cooling towers can be utilized to the maximum extent, and the purposes of optimal heat dissipation and lowest power consumption are achieved.
According to still another aspect of the present invention, there is provided a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements a control method of an air conditioning system according to any one of the above-described aspects.
The computer-readable storage medium provided by the present invention, when being executed by a processor, implements the steps of the control method of the air conditioning system according to any of the above technical solutions, and therefore, the computer-readable storage medium includes all the advantageous effects of the control method of the air conditioning system according to any of the above technical solutions.
Additional aspects and advantages 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
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a flowchart illustrating a control method of an air conditioning system according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating a control method of an air conditioning system according to another embodiment of the present invention;
fig. 3 is a flowchart illustrating a control method of an air conditioning system according to still another embodiment of the present invention;
fig. 4 is a flowchart illustrating a control method of an air conditioning system according to still another embodiment of the present invention;
FIG. 5 illustrates a schematic structural diagram of an air conditioning system according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of the adaptive energy-saving control system of the central air-conditioning cooling tower according to one embodiment of the invention;
FIG. 7 is a flow chart illustrating a method for adaptive energy-saving control of a central air-conditioning cooling tower according to an embodiment of the invention;
fig. 8 is a flow chart illustrating a method for adaptive energy-saving control of a cooling tower of a central air conditioner according to another embodiment of the present invention.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments of the present invention and features of the embodiments may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.
In an embodiment of the first aspect of the present invention, a control method of an air conditioning system is provided, and fig. 1 illustrates a flow chart of the control method of the air conditioning system according to an embodiment of the present invention. Wherein, the method comprises the following steps:
and 104, controlling the number of the started cooling towers and/or adjusting the cooling water flow of any started cooling tower according to the cooling water flows of the plurality of started cooling towers.
In the control method of the air conditioning system provided by the invention, the air conditioning system comprises a plurality of cooling towers, the states of the cooling towers are opened or not opened, the total cooling water flow of all the opened cooling towers is obtained, the number of the opened cooling towers is controlled according to the total cooling water flow, and/or the cooling water flow of any opened cooling tower is adjusted. Through the embodiment of the invention, on one hand, the flow balance of the cooling tower under the condition of constant flow or variable flow is realized, the reduction of the heat dissipation efficiency of the cooling tower caused by the unbalance of the flow distribution of the cooling tower is avoided, and the control cost can be reduced because a static balance valve or a constant flow valve is not required to be additionally arranged. On the other hand, by controlling the number of the cooling towers which are opened, the heat dissipation area of the cooling towers can be utilized to the maximum extent, and the purposes of optimal heat dissipation and lowest power consumption are achieved.
It should be noted that, when the cooling tower is opened, the valve on the cooling tower motor and the valve on the cooling tower water inlet pipe need to be opened at the same time, when the cooling tower is closed, the valve on the cooling tower motor and the valve on the cooling tower water inlet pipe need to be closed at the same time, and the opening degree of the valve on the cooling tower water inlet pipe is adjusted by adjusting the cooling water flow of any opened cooling tower.
It should be noted that, by acquiring the cooling water flow of each started cooling tower at one time or one time period, the total cooling water flow of all started cooling towers is acquired.
In some embodiments, a flow meter is arranged on the water inlet pipe of each cooling tower so as to obtain the cooling water flow of each cooling tower, so that the flow value of each cooling tower can be accurately obtained even when the cooling water system operates at variable flow.
Fig. 2 is a flowchart illustrating a control method of an air conditioning system according to another embodiment of the present invention. Wherein, the method comprises the following steps:
and step 206, controlling the number of the started cooling towers and/or adjusting the cooling water flow of any started cooling tower according to the first target flow and the first flow threshold.
In the embodiment, the first target flow is calculated according to the total cooling water flow of the started cooling towers, and further, according to the magnitude relation between the first target flow and the first flow threshold, the number of the started cooling towers is increased, decreased or maintained and/or the cooling water flow of any started cooling tower is adjusted, so that the cooling tower flow is ensured to be balanced while the heat dissipation area of the cooling tower is ensured to be maximized, and the heat dissipation efficiency of the cooling tower is prevented from being reduced.
The first flow rate threshold is determined according to a variable flow rate lower limit value of the cooling tower of the air conditioning system, for example, the first flow rate threshold is equal to the variable flow rate lower limit value × a, a is a coefficient, and the coefficient may be determined according to actual conditions, for example, a is equal to 0.9. The lower variable flow rate limit value can be set according to the cooling tower parameters.
In any of the above embodiments, the first target flow rate is an average of the cooling water flow rates of the plurality of started cooling towers.
In this embodiment, the first target flow rate is an average value of the cooling water flow rates of the plurality of started cooling towers, and can accurately reflect the average flow rate of all the started cooling towers. And can determine which cooling towers have cooling water flow above the average level and which cooling towers have cooling water flow below the average level.
Fig. 3 is a flowchart illustrating a control method of an air conditioning system according to still another embodiment of the present invention. Wherein, the method comprises the following steps:
the number of cooling towers that have been turned on is kept constant 316.
In this embodiment, when the first target flow rate is smaller than the first flow rate threshold, which indicates that the target flow rate (e.g., average flow rate) of the cooling water flows of the plurality of started cooling towers is low, the number of started cooling towers is reduced to increase the target flow rate, so as to ensure that the cooling tower flow rate control target flow rate is not lower than a certain lower limit value (i.e., the first flow rate threshold).
It should be noted that the number of cooling towers that are turned on and off at one time is not limited, and may be, for example, 1 or more cooling towers that are turned off at one time as the case may be. But to avoid sudden changes in flow, only one cooling tower may be shut down at a time.
In this embodiment, the first target flow is greater than or equal to the first flow threshold, which indicates that the target flow (e.g., average flow) of the cooling water flows of the plurality of started cooling towers is not lower than a certain lower limit value (i.e., the first flow threshold), at this time, the second target flow is calculated according to the cooling water flows of the plurality of started cooling towers, and when the second target flow is greater than the second flow threshold, the number of started cooling towers is increased, so as to ensure that the cooling towers are started as many as possible, so as to fully utilize the heat dissipation area of the cooling tower filler, and improve the heat dissipation efficiency.
The second flow rate threshold is determined according to a variable flow rate lower limit value of the cooling tower of the air conditioning system, for example, the second flow rate threshold is equal to the variable flow rate lower limit value × b, b is a coefficient, and the coefficient may be determined according to actual conditions, for example, b is equal to 1.1.
In any of the embodiments described above in detail,
wherein L isiThe cooling water flow of the cooling tower is started for the ith station, and n is the number of the cooling water flows of the started cooling tower, wherein i is 1, 2.
In this embodiment, it is assumed that one more cooling tower is opened based on the number of currently opened cooling towers, and the target flow rate after one more cooling tower is opened, that is, the average value of the flow rates of all the cooling towers after one more cooling tower is opened, is calculated. If the average flow is greater than the second flow threshold, it indicates that the average flow is not below a lower limit (i.e., the second flow threshold), i.e., a cooling tower is allowed to be opened, then an unopened cooling tower is opened.
In any of the above embodiments, before reducing the number of cooling towers that have been started in step 308, the method further includes: judging whether the number of the started cooling towers is larger than a first number threshold value or not; the number of cooling towers that have been turned on is greater than the first number threshold and step 308 is entered.
In this embodiment, before controlling to reduce the number of the opened cooling towers, it is determined whether the number of the opened cooling towers can be reduced or not, and when the number of the opened cooling towers is smaller than or equal to a first number threshold value, the number is kept unchanged, so as to avoid that the air conditioning system cannot normally operate due to excessive number of the closed cooling towers or complete closing; if the number of the opened cooling towers is larger than the first number threshold, the number can be reduced, and the flow control target flow of the cooling towers is not lower than a certain lower limit value.
In any of the above embodiments, before increasing the number of started cooling towers in step 314, the method further includes: judging whether the number of the opened cooling towers is smaller than a second number threshold value or not; the number of cooling towers that have been turned on is less than the second number threshold and step 314 is entered.
In this embodiment, before controlling to increase the number of started cooling towers, it is necessary to determine whether the number can be increased, and when the number of started cooling towers is greater than or equal to a second number threshold value, which indicates that the number of started cooling towers reaches an upper limit, the number is kept unchanged; if the number of the started cooling towers is smaller than the second number threshold, the number can be increased, the cooling towers can be started as much as possible, so that the heat dissipation area of the cooling tower filler is fully utilized, and the heat dissipation efficiency is improved.
Fig. 4 is a flowchart illustrating a control method of an air conditioning system according to still another embodiment of the present invention. Wherein, the method comprises the following steps:
step 408, reducing the number of started cooling towers;
and step 420, reducing the opening degree of the valve corresponding to the opened cooling tower so as to reduce the flow of the cooling water of the opened cooling tower.
In this embodiment, the first target flow rate is greater than or equal to the first flow rate threshold, and the second target flow rate is less than or equal to the second flow rate threshold, which indicates that if the average flow rate of all cooling towers is lower than a certain lower limit value (i.e., the second flow rate threshold) after more than one cooling tower is started, the cooling water flow rate of the started cooling towers is adjusted while keeping the number of currently started cooling towers unchanged. Specifically, for any cooling tower, if the current cooling water flow of the cooling tower is smaller than a first target flow, the opening degree of a valve corresponding to the opened cooling tower is increased to increase the cooling water flow of the opened cooling tower; if the current cooling water flow of the cooling tower is larger than or equal to the first target flow, the opening degree of a valve corresponding to the opened cooling tower is reduced so as to reduce the cooling water flow of the opened cooling tower, ensure the flow balance of the cooling tower and avoid the reduction of the cooling efficiency of the cooling tower caused by the flow distribution unbalance of the cooling tower.
In any of the above embodiments, before reducing the number of cooling towers that have been started in step 408, the method further includes: judging whether the number of the started cooling towers is larger than a first number threshold value or not; the number of cooling towers that have been turned on is greater than the first number threshold and step 408 is entered.
In any of the above embodiments, before increasing the number of cooling towers that have been started in step 414, the method further includes: judging whether the number of the opened cooling towers is smaller than a second number threshold value or not; the number of cooling towers that have been turned on is less than the second number threshold and step 414 is entered.
In a second aspect of the present invention, an air conditioning system is provided, and fig. 5 shows a schematic structural diagram of the air conditioning system according to an embodiment of the present invention. Wherein, this air conditioning system includes:
a plurality of cooling towers 502;
a plurality of flow rate detection devices 504, wherein any flow rate detection device 504 is connected with the cooling tower 502, and the flow rate detection device 504 detects the flow rate of the cooling water corresponding to the cooling tower 502;
a memory (not shown in the figure) storing a computer program;
the controller 506, the controller 506 is connected to the flow rate detection device 504 and the memory, and the controller 506 implements the control method of the air conditioning system according to any one of the embodiments described above when executing the computer program.
The air conditioning system provided by the invention comprises a plurality of cooling towers 502, a plurality of flow detection devices 504, a plurality of valves (not shown in the figure), a memory and a controller 506, wherein the flow detection devices 504 and the valves are arranged on the water inlet pipe of each cooling tower 502. When the cooling towers 502 are turned on, the flow detection device 504 detects the flow rate of the cooling water, and the controller 506 controls the number of the turned-on cooling towers 502 and/or adjusts the flow rate of the cooling water of any turned-on cooling tower 502 according to the total flow rate of the cooling water of the turned-on cooling towers 502. Through the embodiment of the invention, on one hand, the flow balance of the cooling tower under the condition of constant flow or variable flow is realized, the reduction of the heat dissipation efficiency of the cooling tower caused by the unbalance of the flow distribution of the cooling tower is avoided, and the control cost can be reduced because a static balance valve or a constant flow valve is not required to be additionally arranged. On the other hand, by controlling the number of the cooling towers which are opened, the heat dissipation area of the cooling towers can be utilized to the maximum extent, and the purposes of optimal heat dissipation and lowest power consumption are achieved.
In some embodiments, the number of the flow rate detection devices 504 provided on the water inlet pipe of each cooling tower 502 is one or more, and when there are a plurality of flow rate detection devices 504, the average value of the flow rates of the plurality of flow rate detection devices 504 can be calculated as the cooling water flow rate of the cooling tower 502.
In some embodiments, the flow sensing device 504 includes an electromagnetic flow meter, an ultrasonic flow meter, a turbine flow meter, or the like, and the valve is an electrically-actuated regulator valve. In some embodiments, the valve is a proportional integral valve.
The following technical problems exist in the related art: (1) when the cooling pump operates at variable flow, the flow distribution of each cooling tower is unbalanced, so that the heat dissipation efficiency of the cooling tower is reduced, namely, because the resistance coefficient of each cooling tower branch is not a fixed value, when the flow changes, the branch resistance is not changed in equal proportion, so that the flow is unbalanced; (2) when the cooling water system operates in a variable flow mode, the flow value of each cooling tower cannot be known, and whether the flow value is the variable flow lower limit of the cooling tower cannot be judged; (3) the number of the cooling towers needing to be opened can not be judged according to the system flow and the heat exchange condition of the cooling towers, so that the heat dissipation area of the cooling towers is utilized to the maximum extent, and the purpose of optimal heat dissipation and lowest power consumption is achieved.
In an embodiment of the present invention, an adaptive energy-saving control system for a cooling tower of a central air conditioner is provided, as shown in fig. 6, the system includes: a cooling tower controller 602, a cooling tower strong cabinet 604, a first cooling tower 606, a second cooling tower 608, a third cooling tower 610, a first flowmeter 6062, a second flowmeter 6082, a third flowmeter 6102, a first electric valve 6064, a second electric valve 6084, a third electric valve 6104, a first cooling pump 6066, a second cooling pump 6086, and a third cooling pump 6106.
The cooling tower controller 602 may be integrated into a group control system or may be used alone as a controller to communicate with the cooling tower power cabinet 604 and collect the operating status of the cooling tower and issue operating status change commands. The cooling tower controller 602 can collect cooling water flow data of each tower and opening feedback of the electric valves, and the cooling tower controller 602 controls the flow meters and the electric valves through a cooling tower strong cabinet 604.
The first flow meter 6062 detects the flow rate of the cooling water of the first cooling tower 606, the second flow meter 6082 detects the flow rate of the cooling water of the second cooling tower 608, and the third flow meter 6102 detects the flow rate of the cooling water of the third cooling tower 610, and the first flow meter 6062, the second flow meter 6082, and the third flow meter 6102 may be ultrasonic flow sensors.
The first electric valve 6064, the second electric valve 6084 and the third electric valve 6104 may be proportional-integral valves by adjusting the opening degree of the first electric valve 6064 to adjust the cooling water flow rate of the first cooling tower 606, adjusting the second electric valve 6084 to adjust the cooling water flow rate of the second cooling tower 608 and adjusting the third electric valve 6104 to adjust the cooling water flow rate of the third cooling tower 610.
A first cooling pump 6066 controls the first cooling tower 606 to be turned on or off, a second cooling pump 6086 controls the second cooling tower 608 to be turned on or off, and a third cooling pump 6106 controls the third cooling tower 610 to be turned on or off.
The self-adaptive energy-saving control system of the cooling tower of the central air-conditioning is provided with a flowmeter and an electric valve on each cooling tower branch, calculates the target value of the flow control of each cooling tower branch by detecting the integrated value of the flow of each cooling tower branch (the sum of the flow of each cooling tower branch), and controls the opening of the electric valve, thereby ensuring the flow balance of each cooling tower; meanwhile, a variable flow lower limit value is set according to the cooling tower parameters of actual projects, the flow control target value of the cooling tower is not lower than a certain lower limit value, the cooling tower is opened as many as possible, the heat dissipation area of the cooling tower filler is fully utilized, and the heat dissipation efficiency is improved. As shown in fig. 7, the specific control method includes the following steps:
In step 710, the opening of the electric valve is controlled according to the first target value, so that the target value needs to be kept constant for a period of time, and the problem that the electric valve cannot be adjusted because the first target value continuously fluctuates is avoided. When the current cooling water flow of the cooling tower is larger than or equal to a first target value, increasing the cooling water flow of the cooling tower; and when the current cooling water flow of the cooling tower is smaller than the first target value, reducing the cooling water flow of the cooling tower.
In the above step 706, the specific steps of determining the number of opened cooling towers and performing the operation are shown in fig. 8, and include:
808, keeping the number of the opened cooling towers unchanged;
Step 812, determining whether the number of opened cooling towers is less than the maximum number nmaxIf yes, go to step 814, otherwise go to step 808;
In one embodiment, as described with reference to fig. 6 to 8, the first cooling tower 606 and the second cooling tower 608 of the 3 cooling towers are turned on (i.e. the first cooling pump 6066 and the second cooling pump 6086 are turned on), the third cooling tower 610 is turned off (i.e. the third cooling pump 6106 is turned off), and the lower limit value L of the variable flow rate of the cooling tower is setmin80 CMH. The system comprises the following working steps:
in step 702, the cooling tower controller 602 detects that the number of opened cooling towers is 2, and the collected cooling water flow rates of the 2 cooling tower branches are L1-100 CMH and L2-80 CMH, respectively;
in step 704, a first target value L (2) — (L1+ L2)/2 ═ 90CMH for the cooling water flow rate control of the cooling tower is determined;
the number of cooling tower starts is increased or decreased, as determined in step 706, and the operation is performed in accordance with the first target value L (2) in the step shown in FIG. 8<LminX 0.9 does not hold and the second target value L (3)>LminX 1.1 is not established (the second target value L (3) ═ L1+ L2)/3), the number of open cooling tower units is kept unchanged;
if yes, returning to step 702, otherwise, entering step 710;
in step 710, the valve opening of the electrically operated valve on the cooling tower is controlled according to the first target value L (2) ═ 90CMH, at which time the cooling tower controller 602 issues an instruction: the first electro valve 6064 of the first cooling tower 606 is closed and the second electro valve 6084 of the second cooling tower 608 is opened. Control repeats steps 702 through 708 after a certain amount of time.
In an embodiment of the third aspect of the present invention, a computer-readable storage medium is provided, on which a computer program is stored, which, when executed by a processor, implements the control method of the air conditioning system according to any of the above-mentioned embodiments.
The present invention provides a computer-readable storage medium, wherein a computer program is executed by a processor to implement the steps of the control method of the air conditioning system according to any of the above embodiments, and therefore the computer-readable storage medium includes all the advantages of the control method of the air conditioning system according to any of the above embodiments.
In the description herein, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance unless explicitly stated or limited otherwise; the terms "connected," "mounted," "secured," and the like are to be construed broadly and include, for example, fixed connections, removable connections, or integral connections; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," 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 do not necessarily 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.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A control method of an air conditioning system, comprising:
obtaining the cooling water flow of a plurality of started cooling towers of the air conditioning system;
controlling the number of the started cooling towers and/or adjusting the cooling water flow of any started cooling tower according to the cooling water flows of a plurality of started cooling towers;
controlling the number of the started cooling towers and/or adjusting the cooling water flow of any started cooling tower according to the cooling water flow of a plurality of started cooling towers, and specifically comprises the following steps:
calculating a first target flow according to the cooling water flows of the plurality of started cooling towers;
controlling the number of the started cooling towers and/or adjusting the cooling water flow of any started cooling tower according to the first target flow and a first flow threshold;
controlling the number of the started cooling towers according to the first target flow and the first flow threshold, specifically comprising:
the first target flow is larger than or equal to the first flow threshold, and a second target flow is calculated according to the cooling water flows of the plurality of started cooling towers;
the second target flow is greater than a second flow threshold, and the number of the started cooling towers is increased;
adjusting the flow rate of the cooling water of any one of the started cooling towers according to the first target flow rate and the first flow rate threshold, specifically comprising:
the first target flow rate is greater than or equal to the first flow rate threshold and the second target flow rate is less than or equal to the second flow rate threshold, the cooling water flow rate for any of the turned-on cooling towers is adjusted,
the first target flow is larger than or equal to the cooling water flow of the opened cooling tower, and the opening degree of a valve corresponding to the opened cooling tower is increased so as to increase the cooling water flow of the opened cooling tower;
and the first target flow is smaller than the cooling water flow of the opened cooling tower, and the opening degree of a valve corresponding to the opened cooling tower is reduced so as to reduce the cooling water flow of the opened cooling tower.
2. The control method of an air conditioning system according to claim 1,
the first target flow rate is an average value of the flow rates of the cooling water of the plurality of started cooling towers.
3. The method as claimed in claim 1 or 2, wherein the step of controlling the number of the started cooling towers according to the first target flow rate and the first flow rate threshold value specifically comprises:
the first target flow rate is less than the first flow rate threshold, and the number of started cooling towers is reduced.
4. The control method of an air conditioning system according to claim 1,
the second target flow rate
Wherein L isiThe cooling water flow of the started cooling tower is the ith station, n is the number of the cooling water flows of the started cooling tower, and i is 1, 2.
5. The method of claim 3, further comprising, prior to the step of reducing the number of activated cooling towers:
judging whether the number of the started cooling towers is larger than a first number threshold value or not;
and the number of the started cooling towers is larger than the first number threshold value, and the step of reducing the number of the started cooling towers is carried out.
6. The method of claim 1, further comprising, prior to the step of increasing the number of activated cooling towers:
judging whether the number of the started cooling towers is smaller than a second number threshold value or not;
and the number of the opened cooling towers is smaller than the second number threshold, and the step of increasing the number of the opened cooling towers is carried out.
7. An air conditioning system, comprising:
a plurality of cooling towers;
the flow detection devices are connected with the cooling tower and detect the flow of cooling water of the corresponding cooling tower;
a memory storing a computer program;
a controller connected to the flow rate detection device and the memory, the controller implementing a control method of the air conditioning system according to any one of claims 1 to 6 when executing the computer program.
8. A computer-readable storage medium on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements a control method of an air conditioning system according to any one of claims 1 to 6.
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| JP5363212B2 (en) * | 2008-09-30 | 2013-12-11 | 株式会社日立製作所 | Air conditioning system |
| CN102062459A (en) * | 2010-12-24 | 2011-05-18 | 东莞市虹德电子有限公司 | Energy-saving control system of central air conditioner |
| CN105642040A (en) * | 2014-11-12 | 2016-06-08 | 西安子竹电子科技有限公司 | Novel indoor air purifier |
| CN105020845B (en) * | 2015-03-09 | 2018-03-06 | 厦门立思科技股份有限公司 | A kind of air-conditioning system linkage energy-saving control system and method |
| CN106123215B (en) * | 2016-06-27 | 2019-04-16 | 新奥泛能网络科技股份有限公司 | A kind of air conditioning cooling water system control method and device |
| CN106545930B (en) * | 2016-11-04 | 2019-09-27 | 广东汉维科技有限公司 | A kind of energy-efficient central air conditioner room and power-economizing method |
| CN106642535B (en) * | 2016-11-16 | 2019-06-18 | 珠海格力电器股份有限公司 | Control system and control method for cold station of central air conditioner |
| CN107606730B (en) * | 2017-09-29 | 2020-07-07 | 北京百度网讯科技有限公司 | Method and device for determining a chiller for cooling a data center |
| KR102129078B1 (en) * | 2017-12-29 | 2020-07-02 | 엘지전자 주식회사 | air-conditioning system |
| CN209639213U (en) * | 2018-11-13 | 2019-11-15 | 深圳市绿创人居环境促进中心 | Central air-conditioner cooling water loop dynamic control system |
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