Control method of dry cooler system
By controlling the cooling capacity adjustment components in the dry cooler system based on the temperature difference, including variable frequency fans, spray modules, and electric bypass valves, the problem of high energy consumption in the dry cooler system is solved, achieving rapid response and improved energy efficiency.
Patent Information
- Application Number
- CN202510975355.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-15
- Publication Date
- 2025-11-07
AI Technical Summary
The existing dry cooler system has a simple control logic, which leads to high energy consumption and cannot effectively match the actual needs of the terminal heating device. Existing technologies are difficult to use ambient temperature for effective control in traditional dry cooler systems.
By acquiring the ambient temperature of the dry cooler system and the preset liquid supply temperature at the main liquid supply terminal, the initial and target operating modes of the cooling capacity adjustment components are controlled based on the temperature difference. This includes the adjustment of the variable frequency fan, spray module, electric bypass valve, and precooling module, ensuring that the dry cooler system quickly approaches the actual cooling conditions and reduces energy consumption.
The system achieves rapid response and reduced energy consumption, and improves system compatibility and energy efficiency through dynamic adjustment of ambient temperature and actual liquid supply temperature.
Smart Images
Figure CN120907289A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the field of refrigeration technology, and more particularly, to a control method of a dry cooler system. BACKGROUND
[0002] With the release of green and sustainable energy development policy and the increasing demand for energy-saving data centers, low-energy air conditioning cooling systems and natural cooling systems in the market, dry coolers, as a heat exchange device with low water consumption and effective reduction of mechanical refrigeration energy consumption and improvement of unit energy efficiency, are widely used in the fields of electric power, chemical industry, refrigeration, etc.
[0003] The dry cooler mainly adjusts the refrigeration capacity through a variable frequency fan. The existing technology usually takes the supply liquid temperature of the dry cooler as the only or main basis for adjusting the working condition of the variable frequency fan. This single control logic leads to a mismatch between the actual refrigeration control of the dry cooler and the actual demand of the current end heat generating device or a significant delay, which is not conducive to the stable operation of the heat exchange end and the reduction of the energy consumption of the dry cooler. Although the existing technology also discloses the application of environmental temperature in the control logic of the refrigeration system, it is mainly applied to complex systems with multiple different heat exchange devices, and the purpose is to control different heat exchange devices to cooperate according to the environmental temperature. This method is not suitable for traditional dry cooler systems. SUMMARY
[0004] The present application aims to overcome at least one of the above-mentioned defects of the prior art and provide a control method of a dry cooler system to solve the problems of single control logic and high energy consumption of the dry cooler system.
[0005] The first object of the present application is to provide a control method of a dry cooler system, which comprises a coil group and a cold capacity adjusting assembly for adjusting the refrigeration capacity of the coil group, and the coil group is provided with a total supply liquid end and a total return liquid end. The method comprises: obtaining the environmental temperature of the dry cooler system and the preset supply liquid temperature of the total supply liquid end, and controlling the initial operation mode of the cold capacity adjusting assembly according to the comparison between the environmental temperature and the preset supply liquid temperature; obtaining the actual supply liquid temperature of the total supply liquid end, and controlling the target operation mode of the cold capacity adjusting assembly according to the comparison between the actual supply liquid temperature and the preset supply liquid temperature.
[0006] Since the ambient temperature has a decisive influence on the refrigeration performance of the dry cooler system, in the absence of other heat exchange medium, the refrigeration of the dry cooler system requires that the ambient temperature < the supply liquid temperature < the return liquid temperature, therefore, based on the comparison value between the ambient temperature and the preset supply liquid temperature, the required refrigeration capacity can be estimated, and the initial operation state of the dry cooler system is roughly determined. Based on this concept, first, the initial operation mode of the cold quantity adjusting assembly is controlled according to the comparison between the ambient temperature and the preset supply liquid temperature, so that the dry cooler quickly approaches the actual required refrigeration working condition, avoiding the increase of energy consumption when the dry cooler system is in high load operation for a long time, and then the operation level of the cold quantity adjusting assembly is controlled to meet the actual working condition requirement according to the comparison between the actual supply liquid temperature and the preset supply liquid temperature, so as to reduce the control delay and reduce the energy consumption of the dry cooler system.
[0007] In some embodiments, the initial operation mode of the cold quantity adjusting assembly is controlled according to the comparison between the ambient temperature and the preset supply liquid temperature, comprising: The preset supply liquid temperature, the first preset temperature difference value, the second preset temperature difference value and the third preset temperature difference value are obtained, wherein the first preset temperature difference value > the second preset temperature difference value > the third preset temperature difference value, the difference between the ambient temperature and the preset supply liquid temperature is calculated as the first real temperature difference value, and the initial operation mode of the cold quantity adjusting assembly is controlled according to the comparison between the first real temperature difference value and the first preset temperature difference value, the second preset temperature difference value and the third preset temperature difference value; The target operation mode of the cold quantity adjusting assembly is controlled according to the comparison between the actual supply liquid temperature and the preset supply liquid temperature, comprising: The fourth preset temperature difference value and the fifth preset temperature difference value are obtained, and the actual supply liquid temperature of the total supply liquid end is obtained, wherein the fourth preset temperature difference value > the fifth preset temperature difference value, the difference between the actual supply liquid temperature and the preset supply liquid temperature is calculated as the second real temperature difference value, and the target operation mode of the cold quantity adjusting assembly is controlled according to the comparison between the second real temperature difference value and the fourth preset temperature difference value and the fifth preset temperature difference value.
[0008] In some embodiments, the cold quantity adjusting assembly comprises a fan group, and the fan group is provided with a plurality of variable frequency fans for driving air to pass through the coil group; The initial operation mode of the cold quantity adjusting assembly is controlled according to the comparison between the first real temperature difference value and the first preset temperature difference value, the second preset temperature difference value and the third preset temperature difference value, comprising: In the case of the second preset ambient temperature difference value < the first real temperature difference value ≤ the first preset ambient temperature difference value, the variable frequency fans are controlled to run at the minimum frequency; The target operation mode of the cold quantity adjusting assembly is controlled according to the comparison between the second real temperature difference value and the fourth preset temperature difference value and the fifth preset temperature difference value, comprising: In the case that the second real temperature difference value is greater than the fourth preset temperature difference value, the frequency of the variable frequency fan is increased one by one until the fifth preset temperature difference value is less than or equal to the second real temperature difference value and greater than or equal to the fourth preset temperature difference value; and / or, If the second real temperature difference value is less than the fifth preset temperature difference value, the working state of the variable frequency fan is detected, and in the case that several variable frequency fans are running at a frequency greater than the minimum frequency, the frequency of the variable frequency fan is decreased one by one until the fifth preset temperature difference value is less than or equal to the second real temperature difference value and greater than or equal to the fourth preset temperature difference value.
[0009] In some embodiments, the cold quantity adjusting assembly further comprises a spraying module for spraying a cooling medium to the coil group, and the spraying module is provided with an electrically controlled flow adjusting device for adjusting the spraying flow; The initial operation mode of the cold quantity adjusting assembly according to the comparison of the first real temperature difference value with the first preset temperature difference value, the second preset temperature difference value and the third preset temperature difference value comprises: In the case that the first real temperature difference value is greater than the first preset temperature difference value, the variable frequency fan is controlled to run at the maximum frequency; The target operation mode of the cold quantity adjusting assembly according to the comparison of the second real temperature difference value with the fourth preset temperature difference value and the fifth preset temperature difference value comprises: In the case that the second real temperature difference value is less than the fifth preset temperature difference value, the variable frequency fan is controlled to decrease the frequency one by one until the fifth preset temperature difference value is less than or equal to the second real temperature difference value and greater than or equal to the fourth preset temperature difference value; In the case that the second real temperature difference value is greater than the fourth preset temperature difference value, the spraying module is started, and the spraying flow is adjusted by the electrically controlled flow adjusting device until the fifth preset temperature difference value is less than or equal to the second real temperature difference value and greater than or equal to the fourth preset temperature difference value.
[0010] In some embodiments, the initial operation mode of the cold quantity adjusting assembly according to the comparison of the first real temperature difference value with the first preset temperature difference value, the second preset temperature difference value and the third preset temperature difference value comprises: In the case that the third preset temperature difference value is less than the first real temperature difference value and greater than or equal to the second preset temperature difference value, the variable frequency fan is controlled to run at the minimum frequency; The target operation mode of the cold quantity adjusting assembly according to the comparison of the second real temperature difference value with the fourth preset temperature difference value and the fifth preset temperature difference value comprises: In the case that the second real temperature difference value is less than the fifth preset temperature difference value, the variable frequency fan is controlled to decrease the frequency one by one until the fifth preset temperature difference value is less than or equal to the second real temperature difference value and greater than or equal to the fourth preset temperature difference value.
[0011] In some embodiments, the cold quantity adjusting assembly further comprises an electric bypass valve, the total liquid supply end and the total liquid return end are connected through the electric bypass valve, and the electric bypass valve is used to adjust the flow of the cooling liquid delivered from the total liquid supply end to the total liquid return end. The initial operation mode of the cold quantity adjusting assembly is controlled according to the comparison of the first real temperature difference value with the first preset temperature difference value, the second preset temperature difference value and the third preset temperature difference value, and the initial operation mode comprises: In the case of the first real temperature difference value being less than or equal to the third preset temperature difference value, the variable frequency fans are all stopped and the electric bypass valve is closed. The target operation mode of the cold quantity adjusting assembly is controlled according to the comparison of the second real temperature difference value with the fourth preset temperature difference value and the fifth preset temperature difference value, and the target operation mode comprises: In the case of the second real temperature difference value being less than the fifth preset temperature difference value, the electric bypass valve is started, the opening of the electric bypass valve is controlled to increase at a first preset opening interval until the fifth preset temperature difference value is less than or equal to the second real temperature difference value and the second real temperature difference value is less than or equal to the fourth preset temperature difference value. In the case of the second real temperature difference value being greater than the fourth preset temperature difference value, the variable frequency fans are started one by one until the fifth preset temperature difference value is less than or equal to the second real temperature difference value and the second real temperature difference value is less than or equal to the fourth preset temperature difference value.
[0012] In some embodiments, the method further comprises: The real return liquid temperature of the total liquid return end, the first preset temperature difference threshold value and the second preset temperature difference threshold value are obtained, the first preset temperature difference threshold value is greater than the second preset temperature difference threshold value, the temperature difference value between the real return liquid temperature and the real supply liquid temperature is calculated as a third real temperature difference value, and the operation of the electric bypass valve is controlled according to the comparison of the third real temperature difference value with the first preset temperature difference threshold value and the second preset temperature difference threshold value.
[0013] In some embodiments, the operation of the electric bypass valve is controlled according to the comparison of the third real temperature difference value with the first preset temperature difference threshold value and the second preset temperature difference threshold value, and the operation of the electric bypass valve comprises: In the case of the third real temperature difference value being greater than the first preset temperature difference threshold value, the opening of the electric bypass valve is controlled to increase at a second preset opening interval until the second preset temperature difference threshold value is less than or equal to the third real temperature difference value and the third real temperature difference value is less than or equal to the first preset temperature difference threshold value. In the case of the third real temperature difference value being less than the second preset temperature difference threshold value, the opening of the electric bypass valve is controlled to decrease at a third preset opening interval until the second preset temperature difference threshold value is less than or equal to the third real temperature difference value and the third real temperature difference value is less than or equal to the first preset temperature difference threshold value. In some embodiments, the cold quantity adjusting assembly further comprises a pre-cooling module, the pre-cooling module comprising a wet membrane device and a liquid supplementing device for supplementing liquid to the wet membrane device, the wet membrane device pre-cooling air passing to the coil group, and the liquid supplementing device supplementing liquid to the wet membrane device through a variable frequency water pump; The method further comprises: obtaining a preset pressure difference value, a real input pressure value at an input end of the variable frequency water pump, and a real output pressure value at an output end of the variable frequency water pump, calculating a difference value between the real input pressure value and the real output pressure value as a real pressure difference value, and controlling operation of the variable frequency water pump according to a comparison between the real pressure difference value and the preset pressure difference value.
[0014] In some embodiments, the controlling operation of the variable frequency water pump according to the comparison between the real pressure difference value and the preset pressure difference value comprises: calculating a difference value between the real pressure difference value and the preset pressure difference value as a determined pressure difference value, and obtaining a first preset pressure difference threshold value and a second preset pressure difference threshold value, wherein the first preset pressure difference threshold value > the second preset pressure difference threshold value, and in a case where the determined pressure difference value < the second preset pressure difference threshold value, the variable frequency water pump is controlled to operate at an increased frequency until the second preset pressure difference threshold value ≤ the determined pressure difference value ≤ the first preset pressure difference threshold value. In a case where the determined pressure difference value > the first preset pressure difference threshold value, the variable frequency water pump is controlled to operate at a decreased frequency until the second preset pressure difference threshold value ≤ the determined pressure difference value ≤ the first preset pressure difference threshold value.
[0015] Compared with the prior art, the present application has the following beneficial effects: firstly, the initial operation mode of the cold quantity adjusting assembly is controlled according to a temperature difference value between the ambient temperature and a preset liquid supply temperature, so that the dry cooler quickly approaches the actual required refrigeration working condition, thereby avoiding increasing energy consumption when the dry cooler system is in high-load operation for a long time; then, the operation level of the cold quantity adjusting assembly is adjusted and controlled to match the actual working condition requirement according to the comparison between the real liquid supply temperature and the preset liquid supply temperature, which helps to improve the response speed, reduce the control delay, and reduce the energy consumption of the dry cooler system; in addition, by increasing the spraying module and controlling the opening and closing and spraying flow of the spraying module based on the comparison between the real liquid supply temperature and the preset liquid supply temperature, and by increasing the electric bypass valve between the total liquid return end and the total liquid supply end and controlling the opening and closing and opening degree of the electric bypass valve based on the temperature difference value between the real liquid return temperature and the real liquid supply temperature, the dry cooler system can quickly adjust the cold quantity supply according to the actual working condition through the cold quantity adjusting assembly, thereby significantly reducing the energy consumption; by setting the pre-cooling module and controlling the water pump operation based on the pressure at the input end and the output end of the variable frequency water pump and the preset pressure difference, the dry cooler system can be ensured to operate reliably and stably. BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1 Structure of the dry cooler system of the present application Figure 1 .
[0017] Figure 2 Flow chart of the control method of the dry cooler system of the present application.
[0018] Figure 3 Schematic diagram of the local structure of the dry cooler system of the present application.
[0019] Figure 4 Schematic diagram of the electrical connection of the dry cooler system of the present application.
[0020] Reference signs: controller 1, coil group 2, total liquid supply end 21, total liquid return end 22, fan group 3, variable frequency fan 31, spraying module 4, electrically controlled flow regulating device 41, pre-cooling module 5, wet film device 51, liquid supplementing device 52, variable frequency water pump 53, first temperature sensor 6, second temperature sensor 7, third temperature sensor 8, first pressure sensor 9, second pressure sensor 10, electrically operated bypass valve 11. DETAILED DESCRIPTION
[0021] The drawings of the present application are only used for illustrative description, and cannot be understood as the limitation of the present application. In order to better illustrate the following embodiments, some components in the drawings may be omitted, enlarged or reduced, and do not represent the actual product size; it can be understood by those skilled in the art that some well-known structures in the drawings and their descriptions may be omitted.
[0022] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the present application.
[0023] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not necessarily limit to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices. Embodiment 1 Reference Figure 1The dry cooler system of the embodiment at least comprises a coil set 2 and a cooling capacity adjusting assembly for adjusting the refrigerating capacity of the coil set 2, and the coil set 2 is provided with a total liquid supply end 21 and a total liquid return end 22. The control method of the dry cooler system comprises: The preset liquid supply temperature of the total liquid supply end and the ambient temperature where the dry cooler system is located are obtained, and the initial operation mode of the cooling capacity adjusting assembly is controlled according to the comparison between the ambient temperature and the preset liquid supply temperature. The ambient temperature refers to the dry bulb temperature of the environment where the dry cooler system is located.
[0024] The real liquid supply temperature of the total liquid supply end is obtained, and the target operation mode of the cooling capacity adjusting assembly is controlled according to the comparison between the real liquid supply temperature and the preset liquid supply temperature.
[0025] Based on the comparison between the ambient temperature and the preset liquid supply temperature, the required refrigerating capacity can be estimated, and then the initial operation state of the cooling capacity adjusting assembly is set to approach the cold supply demand of the current working condition. Based on this concept, the initial operation mode of the cooling capacity adjusting assembly is controlled according to the comparison between the ambient temperature and the preset liquid supply temperature, so that the cooling capacity adjusting assembly of the dry cooler system quickly approaches the actual required refrigerating working condition, avoids increasing energy consumption when the dry cooler system is in high-load operation for a long time, and then adjusts the operation level of the cooling capacity adjusting assembly according to the comparison between the real liquid supply temperature and the preset liquid supply temperature to meet the actual working condition requirement, improves the response speed, reduces the control delay, and further reduces the energy consumption of the dry cooler system.
[0026] In specific implementation, reference can be made to Figure 2 The control method of the dry cooler system comprises: Step S100: The preset liquid supply temperature, the ambient temperature, the first preset temperature difference value, the second preset temperature difference value and the third preset temperature difference value are obtained, the difference between the ambient temperature and the preset liquid supply temperature is calculated as a first real temperature difference value, and the initial operation mode of the cooling capacity adjusting assembly is controlled according to the comparison between the first real temperature difference value and the first preset temperature difference value, the second preset temperature difference value and the third preset temperature difference value. Among them, the first preset temperature difference value > the second preset temperature difference value > the third preset temperature difference value.
[0027] Step S200 specifically comprises: obtaining the real liquid supply temperature of the total liquid supply end, the fourth preset temperature difference value and the fifth preset temperature difference value, calculating the difference between the real liquid supply temperature and the preset liquid supply temperature as a second real temperature difference value, and controlling the target operation mode of the cooling capacity adjusting assembly according to the comparison between the second real temperature difference value and the fourth preset temperature difference value and the fifth preset temperature difference value. Among them, the fourth preset temperature difference value > the fifth preset temperature difference value.
[0028] In practical applications, when the ambient temperature is low, the dry cooler system can exchange heat with the coil unit using only ambient air. It can be understood that, according to the law of conservation of energy, in order to ensure that the dry cooler system can cool normally, the ambient temperature must be less than the supply liquid temperature and the return liquid temperature. That is, when only ambient air is used for heat exchange with the coil unit, the difference between the ambient temperature and the return liquid temperature is negative. It can be understood that in step S100 at this time, there is 0℃ > first preset temperature difference value > second preset temperature difference value > third preset temperature difference value.
[0029] In specific implementation, when the cooling capacity of the dry cooler system exceeds the heat dissipation requirements of the terminal heating element, the actual liquid supply temperature is lower than the preset liquid supply temperature, and the second actual temperature difference value is negative. When the cooling capacity of the dry cooler system does not meet the heat dissipation requirements of the terminal heating element, the actual liquid supply temperature is higher than the preset liquid supply temperature, and the second actual temperature difference value is positive. Due to system errors and to avoid frequent operation of the dry cooler system, this invention sets a qualified range for the second actual temperature difference value. In specific implementation, in step S200, the fifth preset temperature difference value and the fourth preset temperature difference value are used as the lower limit and upper limit of the qualified range, respectively. It can be understood that when the second actual temperature difference value is within the range of the fifth preset temperature difference value and the fourth preset temperature difference value, the cooling level of the dry cooler system meets the requirements of the preset liquid supply temperature.
[0030] In some implementations, reference continues. Figure 1 The cooling capacity regulation component includes a fan unit 3, which includes multiple variable frequency fans 31 for driving airflow through the coil unit 2.
[0031] Step S100 in the control method includes step S110: when the second preset ambient temperature difference value < the first actual temperature difference value ≤ the first preset ambient temperature difference value, the variable frequency fan 31 is controlled to operate at the minimum frequency. In specific implementation, the minimum frequency can be the minimum safe operating frequency of the variable frequency fan 31 or a manually set minimum operating frequency.
[0032] Under the premise of executing step S100, step S200 in the control method includes step S210: when the second actual temperature difference value is greater than the fourth preset temperature difference value, control the variable frequency fan 31 to increase the frequency one by one until the fifth preset temperature difference value is less than or equal to the second actual temperature difference value and less than or equal to the fourth preset temperature difference value.
[0033] It is understandable that when the ambient temperature is low, the coil unit cools down only through the ambient air. At this time, the flow rate of the ambient air through the coil unit plays a decisive role in the heat exchange efficiency of the dry cooler system. Since the operating frequency of the variable frequency fan 31 is positively correlated with the air flow rate, the cooling capacity of the dry cooler system can be adjusted by adjusting the frequency of the variable frequency fan 31.
[0034] In the specific implementation, when the first real temperature difference is between the second preset environmental temperature difference and the first preset environmental temperature difference, the environmental air can basically meet the preset heat exchange requirement by means of the fan group running at the minimum frequency. Since the heat generation of the end heat generating device and the return liquid temperature of the total return liquid end will change in actual application, the real supply liquid temperature can gradually approach and finally meet the preset supply liquid temperature interval by further adjusting the running frequency of the variable frequency fan 31, that is, the fifth preset temperature difference ≤ the second real temperature difference ≤ the fourth preset temperature difference.
[0035] In the specific implementation, when the first real temperature difference is between the second preset environmental temperature difference and the first preset environmental temperature difference, the environmental air can basically meet the preset heat exchange requirement by means of the fan group running at the minimum frequency. Since the heat generation of the end heat generating device and the return liquid temperature of the total return liquid end will change in actual application, the real supply liquid temperature can gradually approach and finally meet the preset supply liquid temperature interval by further adjusting the running frequency of the variable frequency fan 31, that is, the fifth preset temperature difference ≤ the second real temperature difference ≤ the fourth preset temperature difference.
[0036] In some control methods, after step S210, if the heat generation of the end heat generating device decreases, the real supply liquid temperature may decrease, and thus the second real temperature difference decreases. Therefore, after step S210, step S211 can be further included: if the second real temperature difference < the fifth preset temperature difference, the working state of the variable frequency fan 31 is detected, and the variable frequency fan 31 is controlled to decrease in frequency one by one until the fifth preset temperature difference ≤ the second real temperature difference ≤ the fourth preset temperature difference, in the case that there are several variable frequency fans 31 running at a frequency greater than the minimum frequency.
[0037] Reference Figure 3 In some embodiments, the cold energy adjusting assembly further includes a spraying module 4 for spraying a cooling medium to the coil group 2, and the spraying module 4 is provided with an electrically controlled flow adjusting device 41 for adjusting the spraying flow. In the specific implementation, the cooling medium can be pure water.
[0038] Step S100 in the control method includes step S120: in the case that the first real temperature difference > the first preset temperature difference, the variable frequency fan 31 is controlled to run at the maximum frequency.
[0039] It can be understood that the first real temperature difference increases, and thus the required refrigeration capacity increases, and thus the variable frequency fan 31 runs at the maximum frequency, wherein the maximum frequency can be the maximum safe working frequency of the variable frequency fan 31 or the maximum working frequency artificially set.
[0040] On the premise of executing step S120, step S200 includes step S220: in the case of the second real temperature difference value < the fifth preset temperature difference value, gradually control the frequency conversion fan 31 to operate at a lower frequency until the fifth preset temperature difference value ≤ the second real temperature difference value ≤ the fourth preset temperature difference value. Since the change in the operation of the cooling capacity adjusting assembly needs to be delayed for a certain period of time before it can be reflected in the change in the real supply liquid temperature, the frequency conversion fan 31 is operated at the maximum frequency for a preset time in step S120, and then the second real temperature difference value is obtained. In addition, each time the frequency conversion fan 31 is controlled to operate at a lower frequency, the dry cooling system is operated for a preset time, and then the second real temperature difference value is obtained.
[0041] In addition, since the spraying module 4 is additionally provided, in the case of starting the spraying module 4 to assist the coil group 2 in cooling, the real supply liquid temperature can theoretically approach the wet-bulb temperature of the environment, and in this case, a lower preset supply liquid temperature can be set, for example, lower than the ambient (dry-bulb) temperature. It can be understood that the first real temperature difference value at this time can be greater than 0°C. Based on this, on the premise of executing step S220, step S200 can further include step S230: in the case of the second real temperature difference value > the fourth preset temperature difference value, start the spraying module 4, and adjust the spraying flow rate through the electrically controlled flow rate adjusting device 41 until the fifth preset temperature difference value ≤ the second real temperature difference value ≤ the fourth preset temperature difference value.
[0042] In some control methods, step S100 includes step S130: in the case of the third preset temperature difference value < the first real temperature difference value ≤ the second preset temperature difference value, control the frequency conversion fan 31 to operate at the minimum frequency; On the premise of executing step S130, step S200 further includes step S240: in the case of the second real temperature difference value < the fifth preset temperature difference value, gradually turn off the frequency conversion fan 31 until the fifth preset temperature difference value ≤ the second real temperature difference value ≤ the fourth preset temperature difference value. After the frequency conversion fan 31 is operated at the minimum frequency for a preset time, the second real temperature difference value is obtained, and in addition, each time one frequency conversion fan 31 is turned off, the dry cooling system is operated for a preset time, and then the second real temperature difference value is obtained.
[0043] In some control methods, with reference to Figure 1 、 3 , 4, the cooling capacity adjusting assembly further includes an electric bypass valve 11, the total supply liquid end 21 and the total return liquid end 22 are connected through the electric bypass valve 11, and the electric bypass valve 11 is used to adjust the flow rate of the cooling liquid delivered by the total supply liquid end 21 to the total return liquid end 22; Step S100 further includes step S140: in the case of the first real temperature difference value ≤ the third preset temperature difference value, control the frequency conversion fan 31 to be turned off and the electric bypass valve 11 to be closed; In the premise of executing step S140, step S200 further comprises step S250: in the case of second real temperature difference value < fifth preset temperature difference value, starting the electric bypass valve 11, controlling the electric bypass valve 11 to increase the opening degree according to the first preset opening degree interval, until the fifth preset temperature difference value ≤ second real temperature difference value ≤ fourth preset temperature difference value. In the case of second real temperature difference value > fourth preset temperature difference value, starting the frequency conversion fan 31 one by one, until the fifth preset temperature difference value ≤ second real temperature difference value ≤ fourth preset temperature difference value.
[0044] In specific implementation, after the frequency conversion fan 31 is all stopped and the electric bypass valve 11 is closed, the second real temperature difference value is obtained again after a preset time interval, in addition, the second real temperature difference value is obtained again after the dry cooler system runs for a preset time after the electric bypass valve 11 is adjusted according to the first preset opening degree interval each time, and the second real temperature difference value is obtained again after the dry cooler system runs for a preset time after the frequency conversion fan 31 is started one by one each time.
[0045] In some control methods, the control method of the dry cooler system comprises: Step S300. Obtaining the real return liquid temperature of the total return liquid end 22, the first preset temperature difference value threshold, and the second preset temperature difference value threshold, wherein the first preset temperature difference value threshold > the second preset temperature difference value threshold, calculating the temperature difference value between the real return liquid temperature and the real supply liquid temperature as the third real temperature difference value, and controlling the operation of the electric bypass valve 11 according to the comparison of the third real temperature difference value with the first preset temperature difference value threshold and the second preset temperature difference value threshold.
[0046] In some control methods, step S300 comprises step S310: in the case of third real temperature difference value > first preset temperature difference value threshold, controlling the electric bypass valve 11 to increase the opening degree according to the second preset opening degree interval, until the second preset temperature difference value threshold ≤ third real temperature difference value ≤ first preset temperature difference value threshold. In the case of third real temperature difference value < second preset temperature difference value threshold, controlling the electric bypass valve to decrease the opening degree according to the third preset opening degree interval, until the second preset temperature difference value threshold ≤ third real temperature difference value ≤ first preset temperature difference value threshold.
[0047] In specific implementation, the third real temperature difference value is calculated again after the dry cooler system runs for a preset time after the electric bypass valve 11 is adjusted according to the second preset opening degree interval each time, and the third real temperature difference value is calculated again after the dry cooler system runs for a preset time after the electric bypass valve 11 is adjusted according to the third preset opening degree interval each time.
[0048] In some control methods, referring to Figure 3The cold quantity adjusting assembly further comprises a pre-cooling module 5, the pre-cooling module 5 comprises a wet film device 51 and a liquid supplementing device 52 for supplementing liquid to the wet film device 51, the wet film device 51 pre-cools air passing to the coil group 2, and the liquid supplementing device 52 supplements liquid to the wet film device 51 through a variable frequency water pump 53; The control method of the dry cooler system comprises the following steps: In step S400, a preset pressure difference value, an actual input pressure value of an input end of the variable frequency water pump 53, and an actual output pressure value of an output end of the variable frequency water pump 53 are obtained, a difference between the actual input pressure value and the actual output pressure value is calculated as an actual pressure difference value, and the operation of the variable frequency water pump 53 is controlled according to a comparison between the actual pressure difference value and the preset pressure difference value.
[0049] In some control methods, step S400 comprises step S410: calculating a difference between the actual pressure difference value and the preset pressure difference value as a determined pressure difference value, and obtaining a first preset pressure difference threshold value and a second preset pressure difference threshold value, wherein the first preset pressure difference threshold value > the second preset pressure difference threshold value, in a case where the determined pressure difference value < the second preset pressure difference threshold value, the variable frequency water pump 53 is controlled to operate at an increased frequency until the second preset pressure difference threshold value ≤ the determined pressure difference value ≤ the first preset pressure difference threshold value. In a case where the determined pressure difference value > the first preset pressure difference threshold value, the variable frequency water pump 53 is controlled to operate at a decreased frequency until the second preset pressure difference threshold value ≤ the determined pressure difference value ≤ the first preset pressure difference threshold value.
[0050] In specific implementation, the first preset pressure difference threshold value is an allowable maximum pressure difference between the input end and the output end when the variable frequency water pump 53 operates normally, and the second preset pressure difference threshold value is an allowable minimum pressure difference between the input end and the output end when the variable frequency water pump 53 operates normally.
[0051] Reference Figure 1 , 3 , 4, the application further provides a dry cooler system, comprising: a controller 1 for any one of the control methods of the dry cooler system described above; a refrigeration module comprising a coil group 2 and a cold quantity adjusting assembly, the cold quantity adjusting assembly comprising a fan group 3, a spraying module 4, an electric bypass valve 11, and a pre-cooling module 5 for the spraying module, and the fan group 3, the spraying module 4, the pre-cooling module 5, and the electric bypass valve are electrically connected to the controller 1.
[0052] In specific implementation, reference is made to Figures 2-3The coil group 2 is provided with a total liquid supply end 21 and a total liquid return end 22, and the electric bypass valve 11 is connected to the total liquid supply end 21 and the total liquid return end 22, and the electric bypass valve 11 adjusts the flow of the cooling liquid delivered by the total liquid supply end 21 to the total liquid return end 22. The fan group 3 includes a plurality of variable frequency fans 31, and each variable frequency fan 31 can be independently controlled by the controller 1. The pre-cooling module 5 includes a wet film device 51 and a liquid supplementing device 52, the wet film device 51 is arranged close to the air inlet side of the coil group 2 to pre-cool and cool the air entering the coil group 2, and the liquid supplementing device 52 is provided with a variable frequency water pump 53, and the liquid supplementing device 52 supplements the liquid to the wet film device 51 through the variable frequency water pump 53.
[0053] The spray module 4 is provided with an electric control flow adjusting device 41 for adjusting the spray flow, and the electric control flow adjusting device 41 is electrically connected to the controller 1. In specific implementation, the electric control flow adjusting device 41 can be realized by using an electromagnetic valve, an electric regulating valve, a variable frequency water pump, etc.
[0054] Reference Figure 4 The dry cooler system further includes: A first temperature sensor 6 for detecting the ambient temperature; A second temperature sensor 7 for detecting the actual liquid supply temperature of the total liquid supply end 21; A third temperature sensor 8 for detecting the actual liquid return temperature of the total liquid return end 22; A first pressure sensor 9 for detecting the actual input pressure of the input end of the variable frequency water pump 53; A second pressure sensor 10 for detecting the actual output pressure of the output end of the variable frequency water pump 52; The first temperature sensor 6, the second temperature sensor 7, the third temperature sensor 8, the first pressure sensor 9 and the second pressure sensor 10 are all electrically connected to the controller 1.
[0055] Obviously, the above embodiments of the present application are only examples for clearly illustrating the technical solutions of the present application, and are not intended to limit the specific implementation manners of the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims
1. A control method of a dry cooler system, characterized by, The dry cooler system comprises a coil group and a cooling capacity adjusting assembly for adjusting the refrigerating capacity of the coil group, and the coil group is provided with a total liquid supply end and a total liquid return end; The method comprises: obtaining the ambient temperature of the dry cooler system and the preset liquid supply temperature of the total liquid supply end, and controlling the initial operation mode of the cooling capacity adjusting assembly according to the comparison between the ambient temperature and the preset liquid supply temperature; obtaining the actual liquid supply temperature of the total liquid supply end, and controlling the target operation mode of the cooling capacity adjusting assembly according to the comparison between the actual liquid supply temperature and the preset liquid supply temperature.
2. The method according to claim 1, wherein controlling the initial operation mode of the cooling capacity adjusting assembly according to the comparison between the ambient temperature and the preset liquid supply temperature comprises: obtaining a first preset temperature difference value, a second preset temperature difference value and a third preset temperature difference value, wherein the first preset temperature difference value > the second preset temperature difference value > the third preset temperature difference value, calculating the difference between the ambient temperature and the preset liquid supply temperature as a first actual temperature difference value, and controlling the initial operation mode of the cooling capacity adjusting assembly according to the comparison between the first actual temperature difference value and the first preset temperature difference value, the second preset temperature difference value and the third preset temperature difference value; controlling the target operation mode of the cooling capacity adjusting assembly according to the comparison between the actual liquid supply temperature and the preset liquid supply temperature comprises: obtaining a fourth preset temperature difference value and a fifth preset temperature difference value, wherein the fourth preset temperature difference value > the fifth preset temperature difference value, calculating the difference between the actual liquid supply temperature and the preset liquid supply temperature as a second actual temperature difference value, and controlling the target operation mode of the cooling capacity adjusting assembly according to the comparison between the second actual temperature difference value and the fourth preset temperature difference value and the fifth preset temperature difference value.
3. The method of claim 2, wherein, The cooling capacity adjusting assembly comprises a fan group, and the fan group is provided with a plurality of variable frequency fans for driving air to pass through the coil group; controlling the initial operation mode of the cooling capacity adjusting assembly according to the comparison between the first actual temperature difference value and the first preset temperature difference value, the second preset temperature difference value and the third preset temperature difference value comprises: in the case of the second preset temperature difference value < the first actual temperature difference value ≤ the first preset temperature difference value, controlling the variable frequency fans to run at the minimum frequency; controlling the target operation mode of the cooling capacity adjusting assembly according to the comparison between the second actual temperature difference value and the fourth preset temperature difference value and the fifth preset temperature difference value comprises: in the case of the second actual temperature difference value > the fourth preset temperature difference value, controlling the variable frequency fans to run at an increasing frequency one by one until the fifth preset temperature difference value ≤ the second actual temperature difference value ≤ the fourth preset temperature difference value; and / or, if the second actual temperature difference value < the fifth preset temperature difference value, detecting the working state of the variable frequency fans, and in the case that there are a plurality of variable frequency fans running at a frequency greater than the minimum frequency, controlling the variable frequency fans to run at a decreasing frequency one by one until the fifth preset temperature difference value ≤ the second actual temperature difference value ≤ the fourth preset temperature difference value.
4. The method of claim 3, wherein, The cooling capacity adjusting assembly further comprises a spraying module for spraying a cooling medium to the coil group, and the spraying module is provided with an electrically controlled flow adjusting device for adjusting the spraying flow. The initial operation mode of the cold quantity adjusting assembly is controlled according to the comparison of the first real temperature difference value with the first preset temperature difference value, the second preset temperature difference value and the third preset temperature difference value, and the initial operation mode comprises: In the case of the first real temperature difference value > the first preset temperature difference value, the variable frequency fans are controlled to run at the maximum frequency; The target operation mode of the cold quantity adjusting assembly is controlled according to the comparison of the second real temperature difference value with the fourth preset temperature difference value and the fifth preset temperature difference value, and the target operation mode comprises: In the case of the second real temperature difference value < the fifth preset temperature difference value, the variable frequency fans are controlled to run at a decreasing frequency until the fifth preset temperature difference value ≤ the second real temperature difference value ≤ the fourth preset temperature difference value; In the case of the second real temperature difference value > the fourth preset temperature difference value, the spraying module is started, and the spraying flow is controlled by the electrically controlled flow adjusting device until the fifth preset temperature difference value ≤ the second real temperature difference value ≤ the fourth preset temperature difference value.
5. The method of claim 3, wherein, The initial operation mode of the cold quantity adjusting assembly is controlled according to the comparison of the first real temperature difference value with the first preset temperature difference value, the second preset temperature difference value and the third preset temperature difference value, and the initial operation mode comprises: In the case of the third preset temperature difference value < the first real temperature difference value ≤ the second preset temperature difference value, the variable frequency fans are controlled to run at the minimum frequency; The target operation mode of the cold quantity adjusting assembly is controlled according to the comparison of the second real temperature difference value with the fourth preset temperature difference value and the fifth preset temperature difference value, and the target operation mode comprises: In the case of the second real temperature difference value < the fifth preset temperature difference value, the variable frequency fans are controlled to be turned off one by one until the fifth preset temperature difference value ≤ the second real temperature difference value ≤ the fourth preset temperature difference value.
6. The method of claim 3, wherein, The cold quantity adjusting assembly further comprises an electric bypass valve, the total liquid supply end and the total liquid return end are connected through the electric bypass valve, and the electric bypass valve is used to adjust the flow of the cooling liquid delivered from the total liquid supply end to the total liquid return end; The initial operation mode of the cold quantity adjusting assembly is controlled according to the comparison of the first real temperature difference value with the first preset temperature difference value, the second preset temperature difference value and the third preset temperature difference value, and the initial operation mode comprises: In the case of the first real temperature difference value ≤ the third preset temperature difference value, the variable frequency fans are controlled to be stopped and the electric bypass valve is controlled to be closed; The target operation mode of the cold quantity adjusting assembly is controlled according to the comparison of the second real temperature difference value with the fourth preset temperature difference value and the fifth preset temperature difference value, and the target operation mode comprises: In the case of the second real temperature difference value < the fifth preset temperature difference value, the electric bypass valve is started, and the opening of the electric bypass valve is controlled to be increased at a first preset opening interval until the fifth preset temperature difference value ≤ the second real temperature difference value ≤ the fourth preset temperature difference value; In the case of the second real temperature difference value > the fourth preset temperature difference value, the variable frequency fans are started one by one until the fifth preset temperature difference value ≤ the second real temperature difference value ≤ the fourth preset temperature difference value.
7. The method of claim 6, wherein, The method further comprises: The first preset temperature difference threshold value, the second preset temperature difference threshold value, and the real return liquid temperature of the total return liquid end are obtained, the first preset temperature difference threshold value > the second preset temperature difference threshold value, the temperature difference value between the real return liquid temperature and the real supply liquid temperature is calculated as a third real temperature difference value, and the operation of the electric bypass valve is controlled according to the comparison of the third real temperature difference value with the first preset temperature difference threshold value and the second preset temperature difference threshold value.
8. The method of claim 7, wherein, The operation of the electric bypass valve is controlled according to the comparison of the third real temperature difference value with the first preset temperature difference threshold value and the second preset temperature difference threshold value, including: In the case of third real temperature difference value > first preset temperature difference threshold value, the electric bypass valve is controlled to increase the opening degree according to the second preset opening degree interval, until the second preset temperature difference threshold value ≤ third real temperature difference value ≤ first preset temperature difference threshold value; In the case of third real temperature difference value < second preset temperature difference threshold value, the electric bypass valve is controlled to decrease the opening degree according to the third preset opening degree interval, until the second preset temperature difference threshold value ≤ third real temperature difference value ≤ first preset temperature difference threshold value.
9. The method according to any one of claims 3-8, characterized in that, The cold energy regulating assembly further comprises a pre-cooling module, the pre-cooling module comprises a wet membrane device and a liquid supplementing device for supplementing liquid to the wet membrane device, the wet membrane device pre-cools air passing to the coil group, and the liquid supplementing device supplements liquid to the wet membrane device through a variable frequency water pump; The method further comprises: A preset pressure difference value, a real input pressure value of the input end of the variable frequency water pump, and a real output pressure value of the output end of the variable frequency water pump are obtained, the difference between the real input pressure value and the real output pressure value is calculated as a real pressure difference value, and the operation of the variable frequency water pump is controlled according to the comparison of the real pressure difference value with the preset pressure difference value.
10. The method of claim 9, wherein, The operation of the variable frequency water pump is controlled according to the comparison of the real pressure difference value with the preset pressure difference value, including: The difference between the real pressure difference value and the preset pressure difference value is calculated as a determined pressure difference value, and the first preset pressure difference threshold value and the second preset pressure difference threshold value are obtained, the first preset pressure difference threshold value > the second preset pressure difference threshold value, and in the case of determined pressure difference value < second preset pressure difference threshold value, the variable frequency water pump is controlled to operate at an increased frequency until the second preset pressure difference threshold value ≤ determined pressure difference value ≤ first preset pressure difference threshold value; In the case of determined pressure difference value > first preset pressure difference threshold value, the variable frequency water pump is controlled to operate at a decreased frequency until the second preset pressure difference threshold value ≤ determined pressure difference value ≤ first preset pressure difference threshold value.