CN109751911B - Self-adaptive adjusting method for fan frequency of cooling tower and air conditioning system - Google Patents
Self-adaptive adjusting method for fan frequency of cooling tower and air conditioning system Download PDFInfo
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- CN109751911B CN109751911B CN201910069424.6A CN201910069424A CN109751911B CN 109751911 B CN109751911 B CN 109751911B CN 201910069424 A CN201910069424 A CN 201910069424A CN 109751911 B CN109751911 B CN 109751911B
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- 238000001816 cooling Methods 0.000 title claims abstract description 94
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000004378 air conditioning Methods 0.000 title claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 45
- 239000000498 cooling water Substances 0.000 claims description 33
- 230000001276 controlling effect Effects 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 230000003044 adaptive effect Effects 0.000 claims 1
- 230000003750 conditioning effect Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 description 5
- 238000004364 calculation method Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013486 operation strategy Methods 0.000 description 1
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- 238000005070 sampling Methods 0.000 description 1
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Abstract
The invention discloses a self-adaptive adjusting method for the frequency of a cooling tower fan and an air conditioning system. The adjusting method comprises the following steps: acquiring the number of running water chilling units, the number of cooling towers, the number of fans of a single cooling tower and the rated frequency of fan frequency; determining the upper limit value of the fan frequency according to the number of the running water chilling units, the number of the cooling towers, the number of fans of a single cooling tower and the rated frequency of the fan frequency; and adjusting the fan frequency according to the upper limit value of the fan frequency. The invention ensures that the fan of the cooling tower is still in the lower limit temperature range under the energy-saving running state, thereby leading the water chilling unit to save more energy.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a self-adaptive adjusting method for the frequency of a fan of a cooling tower and an air conditioning system using the adjusting method.
Background
the adjustment of the frequency of the cooling tower fan in the central air-conditioning system determines the cooling effect of the cooling tower variable-frequency fan on a cooling water system and the power consumption ratio of the system design. The energy consumption of the water chilling unit is correspondingly influenced by the cooling water outlet temperature of the cooling tower, and the energy efficiency ratio COP of the unit is reduced by 3% when the temperature of the cooling water entering the chiller rises by 1 ℃. The outlet water temperature of the cooling tower is affected by the outdoor wet bulb temperature in different regions and different climates, namely the higher the outdoor wet bulb temperature is, the higher the lower limit temperature of the outlet water of the cooling tower is, and the water temperature cannot be continuously reduced when the wet bulb temperature reaches a certain range. Therefore, in summer in a certain area, the situation that the water temperature is not reduced when fans of all systems of the cooling tower run at full frequency still occurs, and the fans have the same cooling effect when running at a certain frequency lower than 50 Hz. In addition, when the outdoor wet bulb temperature cannot be obtained through the outdoor humidity sensor, or when no humidity sensor exists, a fan full-frequency operation strategy is generally adopted, the power consumption of the system is improved by the method, and the cooling effect cannot be further improved.
Disclosure of Invention
The invention provides a self-adaptive adjusting method for the frequency of a cooling tower fan and an air-conditioning system using the adjusting method, and aims to solve the technical problems that the cooling tower fan is large in power consumption ratio when running at the highest frequency and the cooling effect cannot be further improved in the prior art.
The invention provides a self-adaptive adjusting method for the frequency of a fan of a cooling tower, which comprises the following steps:
Acquiring the number of running water chilling units, the number of cooling towers, the number of fans of a single cooling tower and the rated frequency of fan frequency;
Determining the upper limit value of the fan frequency according to the number of the running water chilling units, the number of the cooling towers, the number of fans of a single cooling tower and the rated frequency of the fan frequency;
And adjusting the fan frequency according to the upper limit value of the fan frequency.
Preferably, all the fans that are turned on are adjusted simultaneously and at the same frequency.
preferably, the upper limit value of the fan frequency is less than or equal to the rated frequency of the fan.
The adjusting method provided by the invention also comprises the step of controlling the starting and stopping states of the cooling tower fan.
The starting temperature range of the cooling tower fan is 20-29 ℃, and the temperature is the water temperature in the cooling water return main pipe.
In one embodiment, the starting temperature of the cooling tower fan is the average value of the cooling water temperature in the cooling water return main pipe on the previous day. As an alternative mode, the temperature of cooling water in the cooling water return main pipe can be detected in real time, and the cooling tower fan is started when the temperature of the cooling water is within the range of 20-29 ℃.
The closing temperature of the cooling tower fan meets the relation: t isopener≥TClosing deviceA value of + B, wherein,
TOpenerFor cooling the starting temperature, T, of the fanclosing deviceIs the off temperature of the cooling fan.
Preferably, the value range of the B value is 3-8 ℃.
And when the running water chilling unit is a screw unit, the closing temperature of the cooling fan is not lower than 18 ℃.
when the running water chilling unit is a centrifugal machine, the closing temperature of the cooling fan is not lower than 12 ℃.
The invention also provides an air conditioning system which uses the self-adaptive cooling tower fan frequency adjusting method.
Compared with the prior art, the invention has the following beneficial effects:
1. According to the invention, the upper limit value of the frequency of the fan is optimized, so that the fan of the cooling tower is in a more energy-saving running state, and the outlet water temperature of the cooling tower is still in the lower limit temperature range all the time, thus the water chilling unit is more energy-saving.
2. Compared with a method for controlling the outlet water temperature of the cooling tower by installing an outdoor temperature and humidity sensor, the method is more reliable, and the outdoor temperature and humidity sensor does not need to be installed.
Drawings
FIG. 1 is a schematic diagram of a cold water system of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and examples. It should be understood that the following specific examples are only for illustrating the present invention and are not to be construed as limiting the present invention.
FIG. 1 is a schematic diagram of a chilled water system. The cold water system of the air conditioning system comprises a cold water unit 1, a cooling water supply header pipe 2 connected with the cold water unit, a cooling water return header pipe 3, a cooling tower (not shown), a fan 4 and a cooling water pump 5. One cooling tower comprises at least one fan and adopts a full-frequency-conversion control scheme. When the cooling tower is in work, the frequency of the cooling tower fan is adjusted, and the cooling tower is enabled to reduce the temperature of cooling water outlet as much as possible in the most energy-saving and simple mode along with the load change of an air conditioning unit and the change of outdoor environment temperature and humidity under the condition that the flow of cooling water is stable and unchanged.
When the outdoor wet bulb temperature is higher, the lower limit temperature of the outlet water of the cooling tower is also high, in order to continuously reduce the temperature of the outlet water, the frequency increasing condition in the existing control method is loaded to the highest frequency, and the highest frequency in the common design is set as the rated frequency, generally 50Hz, or is set as a fixed value through the manufacturer parameters. When the cooling tower equipment is abnormal or the water chilling units run in different quantities, the fans can run at the highest frequency of 50 Hz. Namely, under the condition of low-load operation of a cold machine, the temperature of cooling return water cannot be reduced due to higher temperature of a wet bulb, and the fan is still added with frequency to operate at the highest frequency, so that the fan does useless work.
Aiming at the problems, the invention provides a self-adaptive adjusting method for the upper limit value of the fan frequency of a cooling tower.
The adjusting method carries out parameter optimization on the upper limit value of the fan frequency according to the number of the running water chilling units, the number of the cooling towers, the number of fans of a single cooling tower and the rated frequency of the fan frequency, and controls the change of the fan frequency which is put into the cooling tower to run.
In the regulation and control method, all started fans are regulated simultaneously and have consistent frequency.
In the cooling water system shown in fig. 1, the number of the cooling water pumps which are started is consistent with the number of the units in operation, that is, 3 cooling water pumps correspond to 3 cooling water units, and 2 cooling water pumps correspond to 2 cooling water units. The cooling tower fan is fully open. During actual work, when the water inlet temperature required by the water chilling unit or the condition that the water chilling unit is not required to provide cold energy for standby is met, the cooling water pump and the cooling tower fan can be turned off for energy conservation.
According to practical application tests and by combining the calculation relationship between power and fan frequency, the invention obtains the self-adaptive adjusting method for the fan frequency of the cooling tower, and the method adjusts the upper limit value of the fan operating frequency through the following formula:
wherein: m is the number of running water chilling units, n is the number of cooling towers, and A is the number of fans of a single cooling tower.
The invention adjusts the frequency of the fan through the calculation relation of the frequency and the power, achieves the cooling water outlet temperature matched with the water chilling unit, and further meets the energy-saving requirement of the system.
In one embodiment of frequency control of cooling tower fans, 2 water chilling units, 3 cooling water pumps (one for standby), 4 sets of cooling towers and 1 tower 2 fans are provided. The fan frequencies of the cooling towers with all opened channels are identical, and the running frequencies are identical.
When the number of the units is 1, the number of the cooling towers is 4, and the calculation is carried out by substituting the formula, so that the upper limit of the operating frequency of the fan is 39.7 Hz. The fan frequency is now operated at an upper limit of 39.7 Hz.
When the running number of the unit is 2, the available number of the cooling towers is 4, and the upper limit of the running frequency of the air outlet machine is calculated by substituting the formula to be 50 Hz. At the moment, the fan frequency is operated according to the upper limit value of 50 Hz.
When the number of the units is 1, the number of the cooling towers is 3, and the upper limit of the operating frequency of the air outlet machine is calculated by substituting the formula to be 43.7 Hz. At this time, the fan frequency is operated at an upper limit of 43.7 Hz.
When the number of the units is 2, the number of the cooling tower fans is 3, and the calculation value of the upper limit of the running frequency of the fans is calculated to be 55Hz by substituting the formula. Because the calculated upper limit value of the frequency is greater than the rated frequency 50Hz of the fan frequency, the fan frequency runs according to the rated frequency 50 Hz.
And the other cases are analogized in turn.
The adjusting method provided by the invention limits the upper limit value of the fan frequency, but the frequency conversion control within the upper limit value carries out fan frequency increasing and decreasing according to different algorithms. The optimization formula provided by the invention shows that the frequency conversion effect is achieved by limiting the upper limit of the frequency. And the frequency is controlled according to the traditional PID method and other methods within the upper limit. The method also comprises the step of controlling the starting and stopping states of the cooling tower fan.
The adjusting method provided by the invention also comprises the step of controlling the starting and stopping states of the cooling tower fan. The starting temperature and the closing temperature of the fan of the cooling tower can be set through the temperature of cooling water in the cooling water return main pipe.
Preferably, the cooling fan start temperature set point is in the range of 20 ℃ to 29 ℃. The opening temperature of the centrifugal water chiller and the opening temperature of the screw water chiller are different, the opening temperature is generally used as the lower limit of the cooling water protection temperature of the water chiller, and the water chiller cannot be opened when the opening temperature is lower than the lower limit of the cooling water protection temperature.
As an example, the start temperature of the cooling fan may record an average value of return water temperatures of the cooling main pipe of the previous day as the start temperature, for example, sampling every 10 minutes, and calculating all the adopted average values as the start temperature of the cooling fan. When the starting temperature exceeds the upper limit value, setting according to the upper limit value; and pressing the lower limit value when the starting temperature is lower than the lower limit value.
The self-adaptive algorithm of the set value of the closing temperature and the set value of the starting temperature of the cooling fan meets the relation:
TOpener≥Tclosing deviceA value of + B, wherein,
TOpenerFor cooling the starting temperature, T, of the fanclosing deviceIs the off temperature of the cooling fan.
The value of B in this example is in the range of 3 ℃ to 8 ℃, preferably 4 ℃.
When the running water chilling unit is a screw machine, the closing temperature of the cooling fan is not lower than 18 ℃.
When the running unit is a centrifugal machine, the closing temperature of the cooling fan is not lower than 12 ℃.
The technical scheme provided by the invention is suitable for the situation that no temperature and humidity sensor or the temperature and humidity sensor is damaged, and the fan is designed under the fully-open and fully-closed working condition.
Compared with the method for controlling the outlet water temperature of the cooling tower by installing the outdoor temperature and humidity sensor, the method for controlling the outlet water temperature of the cooling tower is more reliable, and the outdoor temperature and humidity do not need to be installed. The adjusting method provided by the invention has the advantages that the fan of the cooling tower is still in the lower limit temperature range under the energy-saving running state mainly according to the cubic relation between the power and the frequency of the motor of the fan, so that the water chilling unit is more energy-saving.
the foregoing is considered as illustrative only of the embodiments of the invention. It should be understood that any modifications, equivalents and changes made within the spirit and framework of the inventive concept are intended to be included within the scope of the present invention.
Claims (10)
1. A self-adaptive adjusting method for the frequency of a fan of a cooling tower is characterized by comprising the following steps:
Acquiring the number of running water chilling units, the number of cooling towers, the number of fans of a single cooling tower and the rated frequency of fan frequency;
Determining the upper limit value of the fan frequency according to the following formula;
Wherein: m is the number of running water chilling units, n is the number of cooling towers, A is the number of fans of a single cooling tower, and 50 is the rated frequency of the fans;
And adjusting the fan frequency according to the upper limit value of the fan frequency.
2. The method of claim 1, wherein all activated fans are adjusted simultaneously and at the same frequency.
3. The method of regulating according to claim 1, wherein the upper limit value of the fan frequency is less than or equal to the rated frequency of the fan.
4. the method of claim 1, further comprising controlling a start-stop state of a cooling tower fan.
5. The method of claim 4, wherein the start-up temperature of the cooling tower fan is in a range of 20 ℃ to 29 ℃, and the start-up temperature is the temperature of water in the cooling water return main.
6. The method for adjusting the temperature of the cooling tower fan according to claim 5, wherein the starting temperature of the cooling tower fan is the average value of the temperature of cooling water in the cooling water return manifold of the previous day, or the temperature of the cooling water in the cooling water return manifold is detected in real time, and the cooling tower fan is started when the temperature of the cooling water is in the range of 20-29 ℃.
7. The method of adjusting of claim 4, wherein the cooling tower fan off temperature satisfies the following relationship: t isOpener≥TClosing deviceA value of + B, wherein TOpenerfor the starting temperature, T, of the cooling tower fanClosing devicethe value of the B value is 3-8 ℃ for the closing temperature of the cooling tower fan.
8. An adjustment method according to claim 7, characterized in that the cooling tower fan is shut off at a temperature of not less than 18 ℃ when the running water chiller is a screw chiller.
9. The method of conditioning of claim 7 wherein the cooling tower fan shut down temperature is no less than 12 ℃ when the running chiller is a centrifuge.
10. An air conditioning system, characterized in that it uses a cooling tower fan frequency adaptive adjustment method according to any of claims 1-9.
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110514026A (en) * | 2019-07-23 | 2019-11-29 | 江苏天晟节能科技有限公司 | Modularization industrial cooling tower control system and its working method |
| CN111076602A (en) * | 2019-12-31 | 2020-04-28 | 北京世纪互联宽带数据中心有限公司 | Cooling tower fan control method and system |
| CN113916044B (en) * | 2021-04-29 | 2023-10-24 | 高格立节能科技(海南)有限公司 | Real-time variable frequency control method and controller for fan of central air conditioner cooling tower |
| CN113465441B (en) * | 2021-06-29 | 2022-10-28 | 青岛海尔空调电子有限公司 | Control method of cooling tower and storage medium |
| CN113739357B (en) * | 2021-08-24 | 2022-09-16 | 珠海格力电器股份有限公司 | Efficient machine room control method, device and system and central air conditioner |
| CN116007078B (en) * | 2021-10-21 | 2024-07-02 | 中国移动通信集团设计院有限公司 | Method, device and equipment for acquiring operation parameters of refrigeration system |
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| JPS6082793A (en) * | 1983-10-14 | 1985-05-10 | Osaka Sekiyu Kagaku Kk | Controlling method of temperature of cooling water by change of number of revolution of fan for cooling tower |
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