CN103743068B - A kind of air-condition cooling tower blower control method and system of optimizing based on efficiency - Google Patents
A kind of air-condition cooling tower blower control method and system of optimizing based on efficiency Download PDFInfo
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- CN103743068B CN103743068B CN201410033631.3A CN201410033631A CN103743068B CN 103743068 B CN103743068 B CN 103743068B CN 201410033631 A CN201410033631 A CN 201410033631A CN 103743068 B CN103743068 B CN 103743068B
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Abstract
The invention discloses a kind of air-condition cooling tower blower control method and system of optimizing based on efficiency. The method comprises the following steps: after trigger condition occurs, calculate the first efficiency value of current central air-conditioning heat source side, and control and increase or stop a blower fan of cooling tower; Increasing or stopping default the adding after machine delay time or default shutdown delay time after a blower fan of cooling tower, calculate the second efficiency value of current central air-conditioning heat source side; The relatively size of the first efficiency value and the second efficiency value, if relative the first efficiency value of the second efficiency value reduces, correspondingly stops or increasing a blower fan of cooling tower, otherwise the second efficiency value is updated to the first efficiency value. The method and system change increasing or stopping of Automatic Optimal control blower fan of cooling tower according to efficiency value in central air conditioner system running, make the operational energy efficiency of central air conditioner system in higher level, thereby reach energy-conservation object, implementation result is better, and not affected by extraneous factor.
Description
Technical Field
The invention relates to a central air conditioner adjusting technology, in particular to a central air conditioner cooling tower fan control method and system based on energy efficiency optimization.
Background
The central air conditioning system for building includes refrigerator, refrigerating pump, cooling tower and other equipment, and the cold source produced in the refrigerator is conveyed to the end of the air conditioner via the refrigerating pump for heat exchange with the fan coil while the heat source produced in the refrigerator is conveyed to the cooling tower via the cooling pump for heat exchange with outdoor atmosphere.
The heat exchange effect of the heat source is closely related to the refrigeration efficiency of the refrigerator, generally, the efficiency of the refrigerator is improved by about 3% when the temperature of the cooling water return main pipe after heat exchange is reduced by 1 ℃, and conversely, the efficiency of the refrigerator is reduced by about 3% when the temperature of the cooling water return main pipe after heat exchange is increased by 1 ℃. The central air-conditioning system is generally equipped with a plurality of cooling towers, each cooling tower is provided with one or more fans, and the number of the fans of the cooling towers which are opened more is helpful for heat dissipation, namely, the return water temperature of cooling water is reduced, so that the refrigeration efficiency of the refrigerator is improved, but the operation energy consumption of the fans of the cooling towers is correspondingly increased.
In a central air conditioning system without automatic control, the number of cooling tower fans that are turned on is usually controlled by a manager based on his own operating experience. The mode controls the number of the fans of the fixed cooling tower according to the number of the cold machines and seasons, and is dependent on the level and operation of managers, so that the implementation effect is poor.
In the central air-conditioning system with automatic control, the number of the cooling tower fans which are opened is usually controlled according to the temperature of a cooling water return main pipe and the set target temperature of a ladder, and the control method comprises the following steps: (1) loading a cooling tower fan: when the temperature of the cooling water return main pipe is higher than the set target temperature and lasts for a certain time, loading a cooling tower fan; setting a target temperature every few degrees (such as 2 ℃), and starting cooling tower fans one by one. (2) The load reduction cooling tower fan: when the temperature of the cooling water return main pipe is lower than a set target temperature minus a dead zone temperature and lasts for a certain time, unloading a cooling tower fan; (3) and delaying for a certain time after loading or unloading one cooling tower fan, and then judging the next loading and unloading cooling tower fan. The method is only a simple control mode, does not aim at the system operation efficiency, cannot optimize the system operation efficiency, and sometimes causes the system operation efficiency to be low.
Disclosure of Invention
The invention aims to solve the technical problem of providing a central air-conditioning cooling tower fan control method and system based on energy efficiency optimization aiming at the defects of the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: a central air-conditioning cooling tower fan control method based on energy efficiency optimization comprises the following steps:
s1: after the triggering condition occurs, calculating a first energy value of the heat source side of the current central air conditioner, and controlling to additionally start or stop a cooling tower fan;
s2: calculating a second energy value of the heat source side of the current central air conditioner after the preset startup delay time or the preset shutdown delay time after the startup or the stop of one cooling tower fan;
s3: and comparing the first energy efficiency value with the second energy efficiency value, if the second energy efficiency value is reduced relative to the first energy efficiency value, correspondingly stopping or adding one cooling tower fan, otherwise, updating the second energy efficiency value into the first energy efficiency value, and repeating the step S2.
Preferably, the step S1 includes the steps of:
s10: collecting and storing the cold quantity of a first chilled water supply and return water main pipe, the instantaneous electric power of a first refrigerator, the instantaneous electric power of a first cooling pump, the instantaneous electric power of a first cooling tower and a first temperature value outside the cooling tower of the current central air conditioner at intervals of a preset optimized delay time;
s11: calculating and storing a first energy efficiency value of the heat source side of the current central air conditioner;
s12: judging whether the change of the first energy value, the cold quantity of the first chilled water supply and return water main pipe and the first temperature value relative to a third energy value, the cold quantity of a third chilled water supply and return water main pipe and the third temperature value stored in the default or last optimized delay time of the central air-conditioning system exceeds a preset percentage or is timed for a preset optimized time interval, and controlling to start or stop a cooling tower fan according to the judgment result; wherein the judgment result is the trigger condition in step S1;
s13: and updating and storing the first energy value, the cold quantity of the first chilled water supply and return water main pipe and the first temperature value into a third energy value, the cold quantity of a third chilled water supply and return water main pipe and a third temperature value, and repeating the step S10.
Preferably, the step S12 includes:
s120: if the change of the first energy efficiency value is increased by more than a preset percentage compared with the change of the third energy efficiency value, controlling to open a fan of the cooling tower; if the change of the first energy efficiency value is reduced by more than a preset percentage compared with the change of the third energy efficiency value, controlling to stop the cooling tower fan; otherwise, executing step S123; or
S121: if the change of the cold quantity of the first chilled water supply and return water main pipe compared with the cold quantity of the third chilled water supply and return water main pipe is increased by more than a preset percentage, controlling to additionally open a fan of the cooling tower; if the change of the cold quantity of the first chilled water supply and return water main pipe compared with the cold quantity of the third chilled water supply and return water main pipe is reduced by more than a preset percentage, controlling to stop the cooling tower fan; otherwise, executing step S123; or
S122: if the change of the first temperature value compared with the third temperature value is increased by more than a preset percentage, controlling to turn on the fan of the cooling tower; if the change of the first temperature value is reduced by more than a preset percentage compared with the third temperature value, controlling to stop the fan of the cooling tower; otherwise, executing step S123;
s123: controlling to additionally start or stop a fan of the cooling tower after the timing time of a preset optimization time interval is up; otherwise, repeating the steps S120 to S122.
Preferably, the step S1 further includes:
s14: collecting the temperature value of a cooling water supply main pipe and the temperature value of a cooling water return main pipe in real time;
s15: if the temperature value of the cooling water supply main pipe is higher than the protection value of the cooling water supply temperature, a cooling tower fan is additionally started; if the temperature value of the cooling water return main pipe is lower than the cooling water return temperature protection value, stopping one cooling tower fan; otherwise, step S14 is repeated.
Preferably, the step S2 includes:
s20: collecting and storing the cold quantity of a second chilled water supply and return water main pipe, the instantaneous electric power of a second refrigerator, the instantaneous electric power of a second cooling pump and the instantaneous electric power of a second cooling tower of the current central air conditioner after the preset adding delay time after adding one cooling tower fan or the preset stopping delay time after stopping one cooling tower fan;
s21: and calculating the second energy value by using the cold energy of the second chilled water supply and return water main pipe, the instantaneous electric power of the second refrigerator, the instantaneous electric power of the second cooling pump and the instantaneous electric power of the second cooling tower.
Preferably, the first energy efficiency value and the second energy efficiency value are calculated by using the following formulas:
the first energy efficiency value = the cold quantity of the first chilled water supply and return water main pipe/(the first refrigerator instantaneous electric power + the first cooling pump instantaneous electric power + the first cooling tower instantaneous electric power);
the second energy efficiency value = the cold quantity of the second chilled water supply and return water main/(the second refrigerator instantaneous electric power + the second cooling pump instantaneous electric power + the second cooling tower instantaneous electric power).
Preferably, the cooling tower fan which is additionally opened each time is the cooling tower fan with the shortest accumulated running time; stopping the cooling tower fan every time is the cooling tower fan with the longest accumulated operation time.
The invention also provides a central air-conditioning cooling tower fan control system based on energy efficiency optimization, which comprises a data acquisition unit for acquiring data information of a central air-conditioning environment, and a control chip connected with the data acquisition unit and at least one cooling tower fan; the data acquisition unit comprises a first instantaneous electric power meter arranged on the refrigerating machine, a second instantaneous electric power meter arranged on the cooling pump, a third instantaneous electric power meter arranged on the cooling tower, a first thermometer arranged on the cooling water supply main pipe, a second thermometer arranged on the cooling water return main pipe, a third thermometer arranged outside the cooling tower, and a cold meter or a fourth thermometer and a flow meter arranged on the chilled water supply and return main pipe.
Preferably, the control chip comprises a data processing unit for processing data information into control information, a timing unit connected with the data processing unit for timing, and a storage unit connected with the data processing unit for storing data information.
Compared with the prior art, the invention has the following advantages: by implementing the method, the fan of the cooling tower is automatically and optimally controlled to be turned on or off according to the change of the energy efficiency value in the running process of the central air-conditioning system, so that the running energy efficiency of the central air-conditioning system is in a higher level, and the aim of saving energy is fulfilled; the implementation does not depend on the operation of a manager, and the implementation effect is good; and the influence of the uncertain factors of outdoor temperature change and system required cold load is avoided, and the efficiency of the optimized operation of the system is ensured.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a logic block diagram of an embodiment of a central air-conditioning cooling tower fan control system based on energy efficiency optimization according to the invention.
Fig. 2 is a schematic block diagram of an embodiment of a central air-conditioning cooling tower fan control system based on energy efficiency optimization according to the invention.
Fig. 3 is a flow chart of the central air-conditioning cooling tower fan control method embodiment 1 based on energy efficiency optimization.
Fig. 4 is a flow chart of the method for controlling the fan of the cooling tower of the central air conditioner based on the optimization method 2.
Fig. 5 is a flow chart of the method for controlling the fan of the cooling tower of the central air conditioner based on the optimization method of the embodiment 3.
In the figure: 10. a data acquisition unit; 11. a first instantaneous electric power meter; 12. a second instantaneous electric power meter; 13. a third instantaneous electric power meter; 14. a first thermometer; 15. a second thermometer; 16. a third thermometer; 17. a cold flow meter; 20. a control chip; 21. a data processing unit; 22. a timing unit; 23. a storage unit; 30. a freezer; 31. a cooling pump; 32. a cooling water supply main; 33. a cooling water return header pipe; 34. a freeze pump; 35. a chilled water supply main; 36. a chilled water return header pipe; 40. a cooling tower; 50. a cooling tower fan; 60. a fan coil.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
Fig. 1 shows a logic block diagram of an embodiment of a central air-conditioning cooling tower fan control system based on energy efficiency optimization. As shown in fig. 1, the central air conditioning system includes a refrigerator 30, a cooling tower 40, a fan coil 60, a cooling pump 31, a refrigeration pump 34, and the like, wherein at least one cooling tower fan 50 is disposed on the cooling tower 40, the refrigerator 30 is connected to the cooling tower 40 through a cooling water supply main 32 and a cooling water return main 33, and the cooling pump 31 is disposed on the cooling water supply main 32 and the cooling water return main 33; the refrigerator 30 and the fan coil 60 are connected through a chilled water supply manifold 35 and a chilled water return manifold 36, and the refrigeration pump 34 is disposed on the chilled water supply manifold 35 and the chilled water return manifold 36. As shown in fig. 2, the energy efficiency optimization-based central air-conditioning cooling tower fan control system further includes a data acquisition unit 10 for acquiring data information of a central air-conditioning environment, and a control chip 20 connected to the data acquisition unit 10 and at least one cooling tower fan 50, respectively, where the control chip 20 is configured to process the data information acquired by the data acquisition unit 10 into control information for controlling the cooling tower fan 50 to start or stop.
As shown in fig. 1 and 2, the data collecting unit 10 includes a first instantaneous electric power meter 11 disposed on the refrigerator 30 for collecting instantaneous electric power of the refrigerator 30, a second instantaneous electric power meter 12 disposed on the cooling pump 31 for collecting instantaneous electric power of the cooling pump, a third instantaneous electric power meter 13 disposed on the cooling tower 40 for collecting instantaneous electric power of the cooling tower, a first thermometer 14 disposed on the cooling water supply main 32 for collecting temperature of the cooling water supply main 32 in real time, a second thermometer 15 disposed on the cooling water return main 33 for collecting temperature of the cooling water return main 33 in real time, a third thermometer 16 disposed outside the cooling tower 40 for collecting temperature outside the cooling tower 40, and a cold meter 17 disposed on the chilled water return main 36 or the chilled water supply main 35 for calculating cold. It is understood that the cold quantity meter 17 for calculating cold quantity provided on the chilled water return manifold 36 or the chilled water supply manifold 35 may be replaced with a temperature sensor and a flow meter provided on the chilled water supply manifold or the chilled water supply manifold 35, and the cold quantity thereof may be calculated using an integrating meter.
As shown in fig. 2, the control chip 20 includes a data processing unit 21 for processing data information to form control information for controlling the cooling tower fan 50 to be turned on or off, a timing unit 22 connected to the data processing unit 21 for timing, and a storage unit 23 connected to the data processing unit 21 for storing data information.
Example 1
Fig. 3 is a flowchart illustrating a method for controlling a fan of a cooling tower of a central air conditioner based on energy efficiency optimization in embodiment 1 of the present invention. The method for controlling the fan of the cooling tower of the central air conditioner based on energy efficiency optimization comprises the following steps:
s1: and after the triggering condition occurs, calculating a first energy value of the heat source side of the current central air conditioner, and controlling to additionally open one cooling tower fan 50. Specifically, step S1 includes the following steps:
s10: after every preset optimized delay time (such as 30 min), the timing unit 22 on the control chip 20 controls to collect the cold quantity of the first chilled water supply and return water main of the current central air conditioner by using a cold quantity meter 17 for calculating the cold quantity, which is arranged on a chilled water return water main 36 or a chilled water supply water main 35, collect the instantaneous electric power of the first refrigerator by using a first instantaneous electric power meter 11 arranged on the refrigerator 30, collect the instantaneous electric power of the first cooling pump by using a second instantaneous electric power meter 12 arranged on the cooling pump 31, collect the instantaneous electric power of the first cooling tower by using a third instantaneous electric power meter 13 arranged on the cooling tower 40 and collect and store the first temperature value by using a third thermometer 16 arranged outside the cooling tower 40. It can be understood that the first chilled water supply and return header pipe cold quantity comprises the step of collecting the first chilled water return header pipe cold quantity of the current central air conditioner by using the cold quantity meter 17 which is arranged on the chilled water return header pipe 36 and used for calculating the cold quantity or the step of collecting the first chilled water supply header pipe cold quantity of the current central air conditioner by using the cold quantity meter 17 which is arranged on the chilled water supply header pipe 35 and used for calculating the cold quantity.
S11: through a calculation formula of the first effective value: the first energy efficiency value = the cold quantity of the first chilled water supply and return water main pipe/(the first refrigerator instantaneous electric power + the first cooling pump instantaneous electric power + the first cooling tower instantaneous electric power), the first energy efficiency value of the current central air conditioner heat source side is calculated and stored, the first energy efficiency value is calculated by only acquiring the data signal of the current central air conditioner heat source side environment, and dynamic control of the cooling tower fan 50 according to the operation energy efficiency of the heat source side cooling tower fan 50 is achieved more accurately.
S12: and (4) judging whether the calculated first energy value, the first chilled water supply and return header pipe cold quantity and the first temperature value change over a preset percentage or a preset optimization time interval for time, relative to a third energy value, a third chilled water supply and return header pipe cold quantity and a third temperature value stored in the default or last optimization delay time of the central air-conditioning system, taking the judgment result as the triggering condition in the step S1, and controlling to stop one cooling tower fan 50 according to the judgment result. In specific implementation, the preset percentage can be set to be 5-15%, and the smaller the preset percentage is, the more accurate the control is. The value of the timing time of the optimized time interval can be 0-60 min.
Specifically, step S12 includes:
s120: if the change of the first energy efficiency value compared with the third energy efficiency value is increased by more than a preset percentage, if the preset percentage is 10%, controlling to additionally open the cooling tower fan 50 if the first energy efficiency value is 110% or more of the third energy efficiency value; otherwise, step S123 is executed. Or
S121: if the change of the cold energy of the first chilled water supply and return main pipe compared with the cold energy of the third chilled water supply and return main pipe is increased by more than a preset percentage, and if the preset percentage is 10%, controlling to additionally open the cooling tower fan 50 if the cold energy of the first chilled water supply and return main pipe is 110% or more of the cold energy of the third chilled water supply and return main pipe; otherwise, step S123 is executed. Or
S122: if the change of the first temperature value compared with the third temperature value is increased by more than a preset percentage, if the preset percentage is 10%, controlling to additionally start the cooling tower fan 50 if the first temperature value is 110% or more of the third temperature value; otherwise, step S123 is executed.
S123: if the preset optimized time interval timing time is set to be 30min, within 30min after the preset optimized delay time, one condition of the steps S121, S122 or S123 appears, the cooling tower fan 50 is directly controlled to be opened, the step S123 is not needed, and otherwise, the cooling tower fan 50 is controlled to be opened after 30min after the preset optimized delay time.
S13: after the cooling tower fan 50 is controlled to be additionally opened, the first energy value, the cold quantity of the first chilled water supply and return water main pipe and the first temperature value are updated and stored into a third energy value, the cold quantity of the third chilled water supply and return water main pipe and a third temperature value to be used as the basis for next optimization calculation.
S2: and after the preset adding delay time after adding one cooling tower fan 50, calculating a second energy effective value of the heat source side of the current central air conditioner. Specifically, step S2 includes:
s20: after a preset delay time (such as 15 min) of adding one cooling tower fan 50, collecting the cold quantity of a second chilled water supply and return water main pipe of the current central air conditioner by using a cold quantity meter 17 for calculating the cold quantity arranged on a chilled water return water main pipe 36 or a chilled water supply main pipe 35, collecting the instantaneous electric power of a second refrigerating machine by using a first instantaneous electric power meter 11 arranged on the refrigerating machine 30, collecting the instantaneous electric power of the second cooling pump by using a second instantaneous electric power meter 12 arranged on a cooling pump 31, and collecting and storing the instantaneous electric power of the second cooling tower by using a third instantaneous electric power meter 13 arranged on a cooling tower 40.
S21: and a calculation formula of the cold energy of the second chilled water supply and return water main pipe, the instantaneous electric power of the second refrigerating machine, the instantaneous electric power of the second cooling pump and the instantaneous electric power of the second cooling tower through a second energy value is utilized: and the second energy efficiency value = the cold quantity of the second chilled water supply and return water main pipe/(the second refrigerator instantaneous electric power + the second cooling pump instantaneous electric power + the second cooling tower instantaneous electric power), and the second energy efficiency value is calculated.
S3: and comparing the first energy efficiency value with the second energy efficiency value, if the second energy efficiency value is reduced relative to the first energy efficiency value, correspondingly stopping one cooling tower fan 50, otherwise, updating the second energy efficiency value into the first energy efficiency value, and repeating the steps S2 and S3. And under the condition that one cooling tower fan 50 is stopped, repeating the steps S2 and S3, comparing again to obtain that the second energy efficiency value is reduced relative to the first energy efficiency value, and correspondingly controlling to additionally start one cooling tower fan 50. And repeating the steps S2 and S3 until the next trigger condition occurs.
Example 2
Fig. 4 is a flowchart illustrating a method for controlling a fan of a cooling tower of a central air conditioner based on energy efficiency optimization in embodiment 1 of the present invention. The method for controlling the fan of the cooling tower of the central air conditioner based on energy efficiency optimization comprises the following steps:
s1: and after the triggering condition occurs, calculating a first energy value of the heat source side of the current central air conditioner, and controlling to stop one cooling tower fan 50. Specifically, step S1 includes the following steps:
s10: after every preset optimized delay time (such as 30 min), the timing unit 22 on the control chip 20 controls to collect the cold quantity of the first chilled water supply and return water main of the current central air conditioner by using a cold quantity meter 17 for calculating the cold quantity, which is arranged on a chilled water return water main 36 or a chilled water supply water main 35, collect the instantaneous electric power of the first refrigerator by using a first instantaneous electric power meter 11 arranged on the refrigerator 30, collect the instantaneous electric power of the first cooling pump by using a second instantaneous electric power meter 12 arranged on the cooling pump 31, collect the instantaneous electric power of the first cooling tower by using a third instantaneous electric power meter 13 arranged on the cooling tower 40 and collect and store the first temperature value by using a third thermometer 16 arranged outside the cooling tower 40. It can be understood that the first chilled water supply and return header pipe cold quantity comprises the step of collecting the first chilled water return header pipe cold quantity of the current central air conditioner by using the cold quantity meter 17 which is arranged on the chilled water return header pipe 36 and used for calculating the cold quantity or the step of collecting the first chilled water supply header pipe cold quantity of the current central air conditioner by using the cold quantity meter 17 which is arranged on the chilled water supply header pipe 35 and used for calculating the cold quantity.
S11: through a calculation formula of the first effective value: the first energy efficiency value = the cold quantity of the first chilled water supply and return water main pipe/(the first refrigerator instantaneous electric power + the first cooling pump instantaneous electric power + the first cooling tower instantaneous electric power), the first energy efficiency value of the current central air conditioner heat source side is calculated and stored, the first energy efficiency value is calculated by only acquiring the data signal of the current central air conditioner heat source side environment, and dynamic control of the cooling tower fan 50 according to the operation energy efficiency of the heat source side cooling tower fan 50 is achieved more accurately.
S12: and (4) judging whether the calculated first energy value, the first chilled water supply and return header pipe cold quantity and the first temperature value change over a preset percentage or a preset optimization time interval for time, or not, relative to a third energy value, a third chilled water supply and return header pipe cold quantity and a third temperature value stored in the default or last optimization delay time of the central air-conditioning system, taking the judgment result as the triggering condition in the step S1, and controlling one cooling tower fan 50 to stop according to the judgment result. In specific implementation, the preset percentage can be set to be 5-15%, and the smaller the preset percentage is, the more accurate the control is. The value of the timing time of the optimized time interval can be 0-60 min.
Specifically, step S12 includes:
s120: if the first energy efficiency value is reduced by more than a preset percentage compared with the change of the third energy efficiency value, if the preset percentage is 10%, controlling to stop one cooling tower fan 50 if the first energy efficiency value is 90% or less of the third energy efficiency value; otherwise, step S123 is executed. Or
S121: if the cold quantity of the first chilled water supply and return header pipe is increased and reduced by a preset percentage compared with the change of the cold quantity of the third chilled water supply and return header pipe, if the preset percentage is 10%, controlling to stop one cooling tower fan 50 if the cold quantity of the first chilled water supply and return header pipe is 90% or less of the cold quantity of the third chilled water supply and return header pipe; otherwise, step S123 is executed. Or
S122: if the change of the first temperature value compared with the third temperature value is reduced by more than a preset percentage, if the preset percentage is 10%, controlling to stop one cooling tower fan 50 if the first temperature value is 90% or less of the third temperature value; otherwise, step S123 is executed.
S123: if the preset optimized time interval timing time is set to be 30min, within 30min after the preset optimized delay time, one condition of the steps S121, S122 or S123 appears, directly controlling to stop one cooling tower fan 50 without the step S123, otherwise, controlling to stop one cooling tower fan 50 after 30min after the preset optimized delay time.
S13: after the cooling tower fan 50 is controlled to stop, the first energy value, the cold quantity of the first chilled water supply and return water main pipe and the first temperature value are updated and stored into a third energy value, the cold quantity of the third chilled water supply and return water main pipe and a third temperature value to be used as the basis for next optimization calculation.
S2: after a preset shutdown delay time after stopping one cooling tower fan 50, calculating a second energy efficiency value of the heat source side of the current central air conditioner. Specifically, step S2 includes:
s20: after a preset shutdown delay time (for example, 15 min) after stopping one cooling tower fan 50, collecting the cold quantity of a second chilled water supply and return water main pipe of the current central air conditioner by using a cold quantity meter 17 for calculating the cold quantity, which is arranged on a chilled water return water main pipe 36 or a chilled water supply main pipe 35, collecting the instantaneous electric power of the second chiller by using a first instantaneous electric power meter 11 arranged on the chiller 30, collecting the instantaneous electric power of the second cooling pump by using a second instantaneous electric power meter 12 arranged on a cooling pump 31, and collecting and storing the instantaneous electric power of the second cooling tower by using a third instantaneous electric power meter 13 arranged on a cooling tower 40.
S21: and a calculation formula of the cold energy of the second chilled water supply and return water main pipe, the instantaneous electric power of the second refrigerating machine, the instantaneous electric power of the second cooling pump and the instantaneous electric power of the second cooling tower through a second energy value is utilized: and the second energy efficiency value = the cold quantity of the second chilled water supply and return water main pipe/(the second refrigerator instantaneous electric power + the second cooling pump instantaneous electric power + the second cooling tower instantaneous electric power), and the second energy efficiency value is calculated.
S3: comparing the first energy efficiency value with the second energy efficiency value, if the second energy efficiency value is reduced relative to the first energy efficiency value, correspondingly turning on a cooling tower fan 50, otherwise, updating the second energy efficiency value to the first energy efficiency value, and repeating the steps S2 and S3. And repeating the steps S2 and S3 under the condition that one cooling tower fan 50 is additionally arranged, comparing again to obtain that the second energy efficiency value is reduced relative to the first energy efficiency value, and correspondingly controlling to stop one cooling tower fan 50. And repeating the steps S2 and S3 until the next trigger condition occurs.
To sum up, under the condition that one cooling tower fan 50 is additionally arranged, if the second energy efficiency value is reduced relative to the first energy efficiency value, one cooling tower fan 50 is correspondingly controlled to be stopped; under the condition that one cooling tower fan is stopped, if the second energy efficiency value is reduced relative to the first energy efficiency value, the cooling tower fan 50 is correspondingly controlled to be opened, so that the cooling tower fan is automatically and optimally controlled to be opened or stopped according to the change of the energy efficiency value in the running process of the central air-conditioning system, the running energy efficiency of the central air-conditioning system is enabled to be at a higher level, the energy-saving purpose is achieved, the implementation effect is better compared with a manual operation mode, and the influence of external factors is avoided.
Example 3
Fig. 5 is a flowchart illustrating a method for controlling a fan of a cooling tower of a central air conditioner based on energy efficiency optimization in embodiment 3 of the present invention. The energy efficiency optimization-based method for controlling a fan of a cooling tower of a central air conditioner in embodiment 3 is implemented on the basis of embodiments 1 and 2, and step S1 in embodiments 1 and 2 further includes:
s14: the temperature value of the cooling water supply main pipe 32 is collected in real time by using a first thermometer 14 arranged on the cooling water supply main pipe 32, and the temperature value of the cooling water return main pipe 33 is collected by using a second thermometer 15 arranged on the cooling water return main pipe 33.
S15: comparing the collected temperature values of the cooling water supply main pipe 32 and the cooling water return main pipe 33 with the protection value (for example, 38 ℃) of the cooling water supply temperature and the protection value (for example, 22 ℃) of the cooling water return temperature, and if the temperature value (for example, 40 ℃) of the cooling water supply main pipe 32 is higher than the protection value of the cooling water supply temperature, opening one cooling tower fan 50 additionally, and executing steps S2 to S3 in embodiment 1. If the temperature value of the cooling water return main pipe 33 (for example, at 20 ℃) is lower than the cooling water return temperature protection value, one cooling tower fan 50 is stopped, and steps S2 to S3 in embodiment 2 are executed.
In embodiments 1 to 3, the cooling tower fan 50 that is additionally opened each time is controlled to be the cooling tower fan 50 with the shortest accumulated operation time; stopping the cooling tower fan 50 every time is the cooling tower fan 50 with the longest accumulated operation time to ensure the overall life of the central air conditioning cooling tower fan 50.
According to the method and the system for controlling the central air-conditioning cooling tower fan based on energy efficiency optimization, the cooling tower fan 50 is automatically and optimally controlled to be turned on or off according to the change of the energy efficiency value in the running process of the central air-conditioning system, so that the running energy efficiency of the central air-conditioning system is in a higher level, the energy-saving purpose is achieved, namely the running number of the cooling tower fan is controlled to be in the higher level when the energy efficiency value is highest through the optimization process, and the energy consumption of the central air-conditioning system is remarkably reduced. The method and the system are implemented without depending on the operation of a manager, and the implementation effect is good; and the influence of the uncertain factors of outdoor temperature change and system required cold load is avoided, and the efficiency of the optimized operation of the system is ensured.
While the invention has been described with reference to several particular embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from its scope. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (6)
1. A central air-conditioning cooling tower fan control method based on energy efficiency optimization is characterized in that: the method comprises the following steps:
s1: after the triggering condition occurs, calculating a first energy value of the heat source side of the current central air conditioner, and controlling to additionally start or stop a cooling tower fan (50);
s2: after the preset adding delay time or the preset shutdown delay time after adding or stopping one cooling tower fan (50), calculating a second energy value of the heat source side of the current central air conditioner;
s3: comparing the first energy efficiency value with the second energy efficiency value, if the second energy efficiency value is reduced relative to the first energy efficiency value, correspondingly stopping or additionally starting a cooling tower fan (50), otherwise, updating the second energy efficiency value to the first energy efficiency value, and repeating the step S2;
wherein,
the step S1 includes the steps of:
s10: collecting and storing the cold quantity of a first chilled water supply and return water main pipe, the instantaneous electric power of a first refrigerating machine, the instantaneous electric power of a first cooling pump, the instantaneous electric power of a first cooling tower and a first temperature value outside the cooling tower (40) of the current central air conditioner at intervals of a preset optimized delay time;
s11: calculating and storing a first energy efficiency value of the heat source side of the current central air conditioner;
s12: judging whether the change of the first energy value, the cold quantity of the first chilled water supply and return water main pipe and the first temperature value relative to a third energy value, the cold quantity of a third chilled water supply and return water main pipe and the third temperature value stored in the default or last optimized delay time of the central air-conditioning system exceeds a preset percentage or whether the preset optimized time interval is elapsed for timing time, and controlling to start or stop a cooling tower fan (50) according to the judgment result; wherein the judgment result is the trigger condition in step S1;
s13: updating and storing the first energy value, the cold quantity of the first chilled water supply and return water main pipe and the first temperature value into a third energy value, the cold quantity of a third chilled water supply and return water main pipe and a third temperature value, and repeating the step S10;
the step S12 includes:
s120: if the change of the first energy efficiency value is increased by more than a preset percentage compared with the change of the third energy efficiency value, controlling to additionally open a fan (50) of the cooling tower; if the change of the first energy efficiency value is reduced by more than a preset percentage compared with the change of the third energy efficiency value, controlling to stop a cooling tower fan (50); otherwise, executing step S123; or
S121: if the change of the cold quantity of the first chilled water supply and return water main pipe compared with the cold quantity of the third chilled water supply and return water main pipe is increased by more than a preset percentage, controlling to additionally open a fan (50) of the cooling tower; if the change of the cold quantity of the first chilled water supply and return water main pipe compared with the cold quantity of the third chilled water supply and return water main pipe is reduced by more than a preset percentage, controlling to stop a cooling tower fan (50); otherwise, executing step S123; or
S122: if the change of the first temperature value compared with the third temperature value is increased by more than a preset percentage, controlling to additionally open a fan (50) of the cooling tower; if the change of the first temperature value is reduced by more than a preset percentage compared with the third temperature value, controlling to stop the cooling tower fan (50); otherwise, executing step S123;
s123: controlling to additionally start or stop a cooling tower fan (50) after a preset optimized time interval timing time is up; otherwise, repeating the steps S120 to S122;
wherein,
the first energy efficiency value and the second energy efficiency value are calculated by adopting the following formulas:
the first energy value is equal to the cold quantity of the first chilled water supply and return water main pipe/(the instantaneous electric power of the first refrigerating machine + the instantaneous electric power of the first cooling pump + the instantaneous electric power of the first cooling tower);
and the second energy value is the cold quantity of the second chilled water supply and return water main pipe/(the instantaneous electric power of the second refrigerating machine + the instantaneous electric power of the second cooling pump + the instantaneous electric power of the second cooling tower).
2. The energy efficiency optimization-based fan control method for the cooling tower of the central air conditioner is characterized by comprising the following steps of: the step S1 further includes:
s14: collecting the temperature value of a cooling water supply main pipe (32) and the temperature value of a cooling water return main pipe (33) in real time;
s15: if the temperature value of the cooling water supply main pipe (32) is higher than the protection value of the cooling water supply temperature, a cooling tower fan (50) is additionally arranged; if the temperature value of the cooling water return main pipe (33) is lower than the cooling water return temperature protection value, stopping one cooling tower fan (50); otherwise, step S14 is repeated.
3. The energy efficiency optimization-based fan control method for the cooling tower of the central air conditioner is characterized by comprising the following steps: the step S2 includes:
s20: collecting and storing cold energy of a second chilled water supply and return water main pipe, instantaneous electric power of a second refrigerator, instantaneous electric power of a second cooling pump and instantaneous electric power of a second cooling tower of the current central air conditioner after preset adding delay time after adding one cooling tower fan (50) or preset stopping delay time after stopping one cooling tower fan (50);
s21: and calculating the second energy value by using the cold energy of the second chilled water supply and return water main pipe, the instantaneous electric power of the second refrigerator, the instantaneous electric power of the second cooling pump and the instantaneous electric power of the second cooling tower.
4. The energy efficiency optimization-based fan control method for the cooling tower of the central air conditioner is characterized by comprising the following steps of: the cooling tower fan (50) which is additionally opened each time is the cooling tower fan (50) with the shortest accumulated running time; and stopping the cooling tower fan (50) every time is the cooling tower fan (50) with the longest accumulated running time.
5. The utility model provides a central air conditioning cooling tower fan control system based on efficiency is optimized which characterized in that: the system comprises a data acquisition unit (10) for acquiring data information of a central air-conditioning environment, and a control chip (20) connected with the data acquisition unit (10) and at least one cooling tower fan (50); the data acquisition unit (10) comprises a first instantaneous electric power meter (11) arranged on the refrigerator, a second instantaneous electric power meter (12) arranged on the cooling pump, a third instantaneous electric power meter (13) arranged on the cooling tower (40), a first thermometer (14) arranged on the cooling water supply main pipe (32), a second thermometer (15) arranged on the cooling water return main pipe (33), a third thermometer (16) arranged outside the cooling tower (40), and a cold meter (17) or a fourth thermometer and a flow meter arranged on the chilled water supply and return main pipe.
6. The energy efficiency optimization-based fan control system for the cooling tower of the central air conditioner is characterized by comprising the following components in parts by weight: the control chip (20) comprises a data processing unit (21) for processing data information into control information, a timing unit (22) connected with the data processing unit (21) for timing, and a storage unit (23) connected with the data processing unit (21) for storing data information.
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| CN107345777B (en) * | 2017-07-06 | 2019-12-17 | 扬州大学 | Method for determining annual frequency conversion variable angle optimization operation scheme of half-regulation fan of cooling tower |
| CN110513875A (en) * | 2019-08-23 | 2019-11-29 | 广东美的暖通设备有限公司 | A kind of heat pump water-heating machine and its energy-saving control method and device |
| CN112524767B (en) * | 2020-12-07 | 2022-06-24 | 佛山市顺德区美的电子科技有限公司 | Air conditioner control method, air conditioner control device, air conditioner and storage medium |
| CN113644811B (en) * | 2021-08-06 | 2024-03-05 | 湖南优利泰克自动化系统有限公司 | Control method of cooling fan of wind power converter |
| CN113865042A (en) * | 2021-09-13 | 2021-12-31 | 湖南桅灯智能科技有限公司 | Building fresh air processor cold energy transmission efficiency early warning method and device |
| CN113916024B (en) * | 2021-10-26 | 2023-03-17 | 珠海格力电器股份有限公司 | Management method, device and equipment of cooling tower, cooling tower and temperature control system |
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