Control method of cooling system and cooling system

Abstract

The invention relates to the technical field of air conditioner cooling water systems, and discloses a control method of a cooling system and the cooling system.The cooling system comprises a cooling device and a plurality of water cooling units, each water cooling unit communicates with the cooling device through a branch, and each branch is provided with a continuous adjusting valve; the control method comprises the steps that the average value Wi of the total actual operation power of all the water chilling units in a first time period is determined; the cutoff fault frequency a of each water cooling unit in the second time period is determined; determining a correction coefficient b of each water chilling unit according to the cutoff fault frequency a; and the opening degree of each continuous adjusting valve is adjusted according to the mean value Wi, the rated operation total power We of all the water chilling units and the correction coefficient b. According to the control method of the cooling system and the cooling system, the problems that cooling water flow distribution is unbalanced, local hydraulic imbalance occurs, and pipeline oscillation is caused are solved or improved.

Description

Technical Field

[0001] The present application relates to the technical field of air-conditioning cooling water systems, and particularly to a control method for a cooling system and a cooling system. Background Art

[0002] With the innovative development of the air-conditioning system solutions for subway stations, the number of application projects of water-cooled direct expansion units and water-cooled multi-connected units air-conditioning systems is gradually increasing. The water-cooled direct expansion units and water-cooled multi-connected units air-conditioning system projects generally configure multiple water-cooled direct expansion units and multiple water-cooled multi-connected units. The cooling water system needs to supply cooling water to the water-cooled direct expansion units and water-cooled multi-connected units with significantly different cooling capacities at the same time. However, due to the different flow rate and pressure drop characteristics of each unit, it is very difficult to control the cooling water flow rate of each unit, resulting in unbalanced flow rate distribution and local hydraulic imbalance, which in turn causes system oscillation or a sharp drop in the efficiency of some units.

[0003] In the related art, electric butterfly valves or ball valves are provided on the pipelines of the water-cooled direct expansion units and water-cooled multi-connected units, which can only play the role of opening and closing, and cannot adjust the cooling water volume according to the requirements of each water-cooled direct expansion unit and water-cooled multi-connected unit. Summary of the Invention

[0004] In view of this, the present application provides a control method for a cooling system and a cooling system, so as to solve or improve the problems of unbalanced cooling water flow rate distribution, local hydraulic imbalance, and pipeline oscillation.

[0005] In a first aspect, the present application provides a control method for a cooling system. The cooling system includes a cooling device and a plurality of water-cooled units. Each of the water-cooled units is respectively connected to the cooling device through a branch, and a continuously adjustable valve is provided on each of the branches. The control method includes:

[0006] Determining the average value W of the actual total operating power of all water-cooled units within a first time period i ;

[0007] Determining the number of times a of the interruption fault of each water-cooled unit within a second time period;

[0008] Determining a correction coefficient b for each water-cooled unit according to the number of times a of the interruption fault;

[0009] Adjusting the opening degrees of the continuously adjustable valves according to the average value W i , the rated total operating power W of all water-cooled units e and the correction coefficient b.

[0010] In this embodiment, the correction coefficient b of each water-cooled unit is determined according to the number of times a of the interruption fault of each water-cooled unit within the second time period. According to the average value W of the actual total operating power of all water-cooled units within the first time periodi 1. The total rated operating power W of all water-cooled units e and the correction factor b of each water-cooled unit to obtain the opening degree of the continuously adjustable valve connected to the branch of the corresponding water-cooled unit. Continuously regulate the flow rate of the cooling water on its branch through the continuously adjustable valve to meet the cooling water flow requirements of its corresponding water-cooled unit. For different water-cooled units, increase the cooling water with the required flow rate, improve the balance of cooling water flow distribution, and prevent problems such as local hydraulic imbalance and pipeline oscillation.

[0011] In an alternative embodiment, it further includes:

[0012] According to the average value W i and the rated water flow of each cooling water pump, determine the target number of operating cooling water pumps n i ;

[0013] Adjust the actual number of operating cooling water pumps n s to the target number of operating cooling water pumps n i .

[0014] In an alternative embodiment, after adjusting the actual number of operating cooling water pumps n s to the target number of operating cooling water pumps n i , it further includes the steps of:

[0015] Determine the target operating frequency f of each cooling water pump i ;

[0016] Determine the first difference between the target operating frequency f of each cooling water pump i and the actual operating frequency f of each cooling water pump s ;

[0017] Judge whether the first difference is less than a preset difference;

[0018] If so, keep the actual operating frequency f of each cooling water pump s ;

[0019] If not, adjust the actual operating frequency f of each cooling water pump s to the target operating frequency f of each cooling water pump i .

[0020] In an alternative embodiment, the determining the target operating frequency f of each cooling water pump i , includes the steps of:

[0021] Determine the current total cooling water flow value Q i ;

[0022] According to the flow attenuation coefficient ε of the parallel operation of the cooling water pumps and the current total cooling water flow value Q i and the target number of operating cooling water pumps n i , determine the target operating frequency f of each cooling water pump i .

[0023] In an alternative embodiment, the determination of the current total cooling water flow value Q i includes the steps of:

[0024] Determine the average value η1 of the external efficiency of all the water-cooled units in the first time period;

[0025] Determine the average value η2 of the internal efficiency of all the water-cooled units in the first time period;

[0026] According to the average value η1, the average value η2, the set value of the cooling water temperature difference ΔT i and the average value W i , determine the current total cooling water flow value Q i .

[0027] In an alternative embodiment, the determination of the average value η1 of the external efficiency of all the water-cooled units in the first time period includes:

[0028] Determine the average value η1 according to the average evaporation temperature T1 and the average condensation temperature T2 of all the water-cooled units in the first time period.

[0029] In an alternative embodiment, the determination of the average value η2 of the internal efficiency of all the water-cooled units in the first time period includes:

[0030] Determine the average value η2 according to the average load factor α of all the water-cooled units in the first time period.

[0031] In an alternative embodiment, it further includes:

[0032] Determine the actual average temperature difference ΔT between the outlet water temperature and the return water temperature of the cooling water in the third time period s ;

[0033] Judge whether the first absolute value of the difference between the actual average temperature difference ΔT s and the set value of the cooling water temperature difference ΔT i is less than the preset value T of the cooling water temperature difference y ;

[0034] If so, keep the actual operating frequency f of each cooling water pump s unchanged;

[0035] If not, adjust the actual operating frequency f of each cooling water pumps 。

[0036] In an alternative embodiment, adjusting the actual operating frequency f of each cooling water pump s comprises the steps of:

[0037] Determine the average value of the actual temperature difference ΔT s higher than the set value of the cooling water temperature difference ΔT i Under the condition, increase the actual operating frequency f of each cooling water pump s ;

[0038] Determine the average value of the actual temperature difference ΔT s lower than the set value of the cooling water temperature difference ΔT i Under the condition, decrease the actual operating frequency f of each cooling water pump s 。

[0039] In a second aspect, the present application further provides a cooling system, comprising:

[0040] A cooling device;

[0041] A plurality of water-cooled units, each of the water-cooled units is respectively connected to the cooling device through a branch, and a continuous regulating valve is provided on each of the branches;

[0042] A first determination module for determining the average value W of the actual total operating power of all water-cooled units within a first time period i ;

[0043] A second determination module for determining the number of times a of the interruption fault of each water-cooled unit within a second time period;

[0044] A third determination module for determining a correction coefficient b of each water-cooled unit according to the number of times a of the interruption fault;

[0045] A control module for adjusting the opening degrees of the respective continuous regulating valves according to the average value W i 、the rated total operating power W of all water-cooled units e and the correction coefficient b.

[0046] In this embodiment, the first determination module determines the average value W of the actual total operating power of all water-cooled units within a first time period i , the second determination module determines the number of times a of the interruption fault of each water-cooled unit within a second time period, the third determination module determines the correction coefficient b of each water-cooled unit according to the number of times a of the interruption fault, adjusts the opening degrees of the respective continuous regulating valves, continuously controls the flow rate of the cooling water on its branch through the continuous regulating valve, meets the demand of the corresponding water-cooled unit for the flow rate of the cooling water, improves the balance of the cooling water flow rate distribution, and prevents the problem of pipeline oscillation caused by local hydraulic imbalance. Brief Description of the Drawings

[0047] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0048] Figure 1 It is a flowchart of a control method for a cooling system according to an embodiment of the present application;

[0049] Figure 2 It is a schematic structural diagram of a cooling system according to an embodiment of the present application;

[0050] Figure 3 It is a characteristic curve diagram of a water pump in a control method for a cooling system according to an embodiment of the present application.

[0051] Description of the reference numerals:

[0052] 1. Cooling device; 2. Water-cooled unit; 3. Cooling water pump; 4. Branch; 5. Continuous regulating valve; 6. Cooling water outlet pipe; 7. Cooling water return pipe; X. Cooling water outlet direction; Y. Cooling water return direction. Detailed Embodiments

[0053] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present application.

[0054] With the innovative development of the subway station air conditioning system solutions, the number of application projects of water-cooled direct expansion units and water-cooled multi-connected units air conditioning systems is gradually increasing. Water-cooled direct expansion units and water-cooled multi-connected units air conditioning system projects generally configure multiple water-cooled direct expansion units and multiple water-cooled multi-connected units. The cooling water system needs to supply cooling water to both the water-cooled direct expansion units and the water-cooled multi-connected units with significantly different cooling capacities at the same time. However, the flow rate and pressure drop characteristics of each unit are different, and it is very difficult to control the cooling water flow rate of each unit, resulting in unbalanced flow distribution and local hydraulic imbalance, which in turn causes system oscillation or a sharp drop in the efficiency of some units.

[0055] In the related art, an electric butterfly valve or a ball valve is provided on the pipelines of a water-cooled direct expansion unit and a water-cooled multi-connected unit, which can only play the role of opening and closing, and cannot adjust the cooling water volume according to the requirements of each water-cooled direct expansion unit and water-cooled multi-connected unit. Therefore, the present application provides a control method and a cooling system for the cooling system to solve or improve the problems of unbalanced distribution of cooling water flow, local hydraulic disorder, and pipeline oscillation caused thereby.

[0056] The following will describe the embodiments of the present application in conjunction with Figures 1 to 3 , the embodiments of the present application will be described.

[0057] According to an embodiment of the present application, on the one hand, as Figure 1 shown, a control method for a cooling system is provided. The cooling system includes a cooling device 1 and a plurality of water-cooled units 2. Each water-cooled unit 2 is respectively connected to the cooling device 1 through a branch 4, and a continuous regulating valve 5 is provided on each branch 4; as Figure 1 shown, the control method includes:

[0058] Step S111: Determine the average value W of the actual operating total power of all water-cooled units 2 within a first time period i .

[0059] Step S112: Determine the number of times a of interruption failure of each water-cooled unit 2 within a second time period.

[0060] Step S113: Determine the correction coefficient b of each water-cooled unit 2 according to the number of times a of interruption failure.

[0061] Step S114: Adjust the opening γ of each continuous regulating valve 5 according to the average value W i , the rated operating total power W of all water-cooled units 2 e and the correction coefficient b.

[0062] In this embodiment, according to the number of times a of interruption failure of each water-cooled unit 2 within a second time period, the correction coefficient b of each water-cooled unit 2 is determined. According to the average value W i of the actual operating total power of all water-cooled units 2 within a first time period, the rated operating total power W e of all water-cooled units 2 and the correction coefficient b of each water-cooled unit 2, the opening of the continuous regulating valve 5 connected to the branch 4 of the corresponding water-cooled unit 2 is obtained. The flow rate of the cooling water on its branch 4 is continuously regulated through the continuous regulating valve 5 to meet the demand for the cooling water flow rate of the corresponding water-cooled unit 2. For different water-cooled units 2, the cooling water with the required flow rate is increased, the balance of the cooling water flow rate distribution is improved, and the problems of local hydraulic disorder and pipeline oscillation caused thereby are prevented.

[0063] In some embodiments, the above steps can be executed in the order described, or they can be executed in the order of step S112, step S113, step S111, and step S114.

[0064] In some embodiments, step S111 and step S112 have no specific order.

[0065] In some embodiments, the second time period can be the 168-hour period before the moment when the number of times of flow interruption faults a is determined. During this time period, the number of times of flow interruption faults of the cooling water flow switch of the water-cooled unit 2 is counted.

[0066] It should be noted that the flow interruption fault of the cooling water flow switch of the water-cooled unit 2 means that the flow supplied to the water-cooled unit 2 is less than the minimum flow required by it. Each time the above situation occurs, one flow interruption fault is recorded.

[0067] Furthermore, the opening γ of the continuous regulating valve 5 is calculated using the following equation;

[0068] where b represents the correction coefficient, a represents the number of times of flow interruption faults, γ represents the opening of the continuous regulating valve 5, W i represents the average value of the actual total operating power of all water-cooled units 2, and W e represents the rated total operating power of all water-cooled units 2.

[0069] In some embodiments, the initial value of the correction coefficient is set to zero.

[0070] In some embodiments, the load rate of multiple water-cooled units 2 corresponding to multiple continuous regulating valves 5 is detected once every ten seconds, and the sum is obtained to get the total load rate. Then, the actual total operating power is obtained through the total load rate, and the average value W of the actual total operating power within the first time period is calculated i .

[0071] In a further embodiment, the first time period can be the ten-minute period before the moment when the load rate of the water-cooled unit 2 is detected.

[0072] In some embodiments, load rate × rated total power of the unit = actual total operating power.

[0073] In some embodiments, the actual operating power of the water-cooled unit 2 can be directly detected through a metering electric meter.

[0074] In one embodiment, it further includes:

[0075] According to the average value W i and the rated water flow of each cooling water pump 3, the target number of operating cooling water pumps 3, n, is determined i ;

[0076] Adjust the actual number of operating units n of the cooling water pump 3 s to the target number of operating units n of the cooling water pump 3 i .

[0077] In this embodiment, according to the mean value W i , the current total cooling water flow value Q is calculated i , and the target number of operating units n of the cooling water pump 3 that can transport the current total cooling water flow value Q is calculated i , and the actual number of operating units n of the cooling water pump 3 is adjusted i to the target number of operating units n of the cooling water pump 3 s to ensure that the current total cooling water flow value Qi can be fully transported to the working water-cooled units 2, avoiding insufficient cooling water flow to some or part of the water-cooled units 2, resulting in a decrease in the efficiency of the water-cooled units 2 and inability to work properly. i， Specifically, the rated operating frequency of each cooling water pump 3 is 50 Hz.

[0078] In one embodiment, after adjusting the actual number of operating units n of the cooling water pump 3

[0079] to the target number of operating units n of the cooling water pump 3 s , the following steps are further included: i Determine the target operating frequency f of each cooling water pump 3

[0080] ; i Determine the first difference between the target operating frequency f of each cooling water pump 3

[0081] and the actual operating frequency f of each cooling water pump 3 i ; s Judge whether the first difference is less than the preset difference;

[0082] If so, keep the actual operating frequency f of each cooling water pump 3

[0083] ; s If not, adjust the actual operating frequency f of each cooling water pump 3

[0084] to the target operating frequency f of each cooling water pump 3 s ; i .

[0085] In this embodiment, after determining the actual number of operating units n of the cooling water pump 3 s , calculate the target operating frequency f of each cooling water pump 3 i so that each cooling water pump 3 operates according to the target operating frequency f i to be able to transport the current total cooling water flow value Q iIt is evenly distributed to each cooling water pump 3 to prevent large local pressure deviation of the cooling water in the cooling system pipeline due to different frequencies of the cooling water pumps 3, resulting in an unstable system.

[0086] Specifically, the preset difference is 5 Hz.

[0087] In one embodiment, determining the target operating frequency f of each cooling water pump 3 i , includes the steps:

[0088] Determine the current total cooling water flow value Q i ;

[0089] According to the flow attenuation coefficient ε of the parallel operation of the cooling water pumps 3, the current total cooling water flow value Q i and the target number of operating units n of the cooling water pumps 3 i , determine the target operating frequency f of each cooling water pump 3 i .

[0090] In this embodiment, the calculation adopts n i units of cooling water pumps 3 to transport the cooling water with the total cooling water flow value Q i before to the water-cooled unit 2, and the most reasonable operating frequency of the cooling water pumps 3 can ensure the safe and efficient operation of multiple cooling water pumps 3, preventing large local pressure deviation of the cooling water in the cooling system pipeline and an unstable system due to different frequencies of the cooling water pumps 3.

[0091] Furthermore, calculate using the following equation, the target operating frequency f of each cooling water pump 3 i ;

[0092] Among them, Q i represents the current total cooling water flow value, ε represents the flow attenuation coefficient of the parallel operation of the cooling water pumps 3, Q e represents the rated water flow of a single cooling water pump 3, and n i represents the target number of operating units of the cooling water pumps 3.

[0093] In some embodiments, as Figure 3 shown, ε can be determined according to the pump characteristic curve.

[0094] In some embodiments, Q e is 122 m 3 / h.

[0095] In one embodiment, determining the current total cooling water flow value Q i , includes the steps:

[0096] Determine the average value η1 of the external efficiencies of all water-cooled units 2 in the first time period;

[0097] Determine the average value η2 of the internal efficiency of all water-cooled units 2 within the first time period;

[0098] Based on the average value η1, the average value η2, and the set value ΔT of the cooling water temperature difference i and the average value W i , determine the current total cooling water flow value Q i .

[0099] In this embodiment, based on the above data, obtain the current total cooling water flow value Q i , which can ensure that the flow rate of the cooling water can meet the flow rate required by all water-cooled units 2 within the entire cooling system, and can avoid the phenomenon that the flow rate of the cooling water supplied by the cooling device 1 is insufficient, resulting in some or part of the water-cooled units 2 being unable to operate normally.

[0100] Moreover, the current total cooling water flow value Q calculated through the average value η1 of the external efficiency of all water-cooled units 2 and the average value η2 of the internal efficiency of all water-cooled units 2 i can reflect the current required flow rate of the cooling water, enabling the flow rate of the cooling water supply and use within the entire cooling system to reach balance.

[0101] In some embodiments, the external efficiency of all water-cooled units 2 is detected once every ten seconds, and the total external efficiency is obtained by summation, and the average value η1 of the external efficiency within the first time period is calculated.

[0102] In a further embodiment, the first time period can be the ten-minute time period before the moment when the external efficiency is detected.

[0103] In some embodiments, the internal efficiency of all water-cooled units 2 is detected once every ten seconds, and the total internal efficiency is obtained by summation, and the average value η2 of the internal efficiency within the first time period is calculated.

[0104] In a further embodiment, the first time period can be the ten-minute time period before the moment when the internal efficiency is detected.

[0105] Furthermore, use the following equation to calculate the current total cooling water flow value Q i .

[0106] where W i represents the average value of the actual total operating power of all water-cooled units 2, η1 represents the average value of the external efficiency of all water-cooled units 2, η2 represents the average value of the internal efficiency of all water-cooled units 2, and ΔT i represents the set value of the cooling water temperature difference.

[0107] Specifically, the set value ΔT of the cooling water temperature difference i is 5°C.

[0108] In one embodiment, determining the mean η1 of the external efficiency of all water-cooled units 2 within a first time period includes:

[0109] Determining the mean η1 based on the mean T1 of the evaporation temperature and the mean T2 of the condensation temperature of all water-cooled units 2 within the first time period.

[0110] In this embodiment, measuring the mean T1 of the evaporation temperature and the mean T2 of the condensation temperature of all water-cooled units 2 within the first time period can improve the accuracy of the mean η1 of the external efficiency.

[0111] Moreover, the mean η1 of the external efficiency of all current water-cooled units 2 can be reflected by the mean T1 of the evaporation temperature and the mean T2 of the condensation temperature, improving the calculation accuracy of the flow rate of the cooling water required within the entire cooling system.

[0112] In some embodiments, the first time period can be a time period of the ten minutes before the moment when the evaporation temperature and the condensation temperature are detected.

[0113] Furthermore, the mean η1 of the external efficiency is calculated using the following equation.

[0114] Wherein, T1 represents the mean of the evaporation temperature of all water-cooled units 2 within the first time period, and T2 represents the mean of the condensation temperature of all water-cooled units 2 within the first time period.

[0115] In one embodiment, determining the mean η2 of the internal efficiency of all water-cooled units 2 within a first time period includes:

[0116] Determining the mean η2 based on the mean α of the operating load rates of all water-cooled units 2 within the first time period.

[0117] In this embodiment, measuring the mean α of the load rates of all water-cooled units 2 over a period of time can improve the accuracy of the mean α of the load rates.

[0118] Moreover, the mean η2 of the internal efficiency of all current water-cooled units 2 can be reflected by the mean α of the load rates, improving the calculation accuracy of the flow rate of the cooling water required within the entire cooling system.

[0119] In some embodiments, the first time period can be a time period of the ten minutes before the moment when the load rate is detected.

[0120] Furthermore, the mean η2 of the internal efficiency is calculated using the following equation.

[0121] Specifically, η2 = -cα 2 + dα + e, where c, d, and e are constants, and α represents the mean of the operating load rates of all water-cooled units 2 within the first time period.

[0122] In some embodiments, c is -0.3509, d is 0.7126, and e is 0.2827.

[0123] In some embodiments, c is -0.4136, d is 0.9018, and e is 0.1145.

[0124] In one embodiment, it further includes:

[0125] Determine the actual average temperature difference ΔT between the outlet water temperature and the return water temperature of the cooling water within the third time period s ;

[0126] Judge the actual average temperature difference ΔT s from the set value ΔT of the cooling water temperature difference i whether the first absolute value of the difference is less than the preset value T of the cooling water temperature difference y ;

[0127] If so, keep the actual operating frequency f of each cooling water pump 3 s unchanged;

[0128] If not, adjust the actual operating frequency f of each cooling water pump 3 s .

[0129] In this embodiment, according to the actual average temperature difference ΔT between the outlet water temperature and the return water temperature of the cooling water s , adjust the actual operating frequency f of each cooling water pump 3 s , ensure that the outlet water temperature and the return water temperature are within a reasonable range, indicating that when each cooling water pump 3 operates at the frequency f s , it can ensure that the cooling water is fully transported to the water-cooled unit 2, and ensure that each water-cooled unit 2 can obtain the appropriate flow of cooling water to ensure its stable and normal operation.

[0130] At the same time, using the average value can reduce the interference of instantaneous fluctuations, combined with the comparison between the set value ΔT of the cooling water temperature difference i and the preset value T of the cooling water temperature difference y , to achieve dynamic adaptive adjustment.

[0131] By dynamically adjusting the actual operating frequency f of each cooling water pump 3 s , avoid the energy waste caused by constant frequency operation. When the average value ΔT s is close to the set value ΔT of the cooling water temperature difference i , keep the frequency stable and reduce unnecessary frequency fluctuations.

[0132] In some embodiments, the third time period may be the time period of the first two minutes before the moment when the outlet water temperature and the return water temperature are detected.

[0133] In some embodiments, the temperature difference between the outlet water temperature of the cooling water outlet pipe 6 and the return water temperature of the cooling water return pipe 7 is detected every ten seconds, and the sum is obtained to get the total temperature difference value, and then the actual temperature difference average value ΔT within the third time period is calculated. s .

[0134] Specifically, the preset value T of the cooling water temperature difference y is 0.5 °C.

[0135] In one embodiment, adjusting the actual operating frequency f of each cooling water pump 3 s includes the steps:

[0136] Determine the actual temperature difference average value ΔT s is higher than the set value ΔT of the cooling water temperature difference i under the condition, then increase the actual operating frequency f of each cooling water pump 3 s ;

[0137] Determine the actual temperature difference average value ΔT s is lower than the set value ΔT of the cooling water temperature difference i under the condition, then decrease the actual operating frequency f of each cooling water pump 3 s .

[0138] In this embodiment, by setting the preset value T of the cooling water temperature difference y , the adjustment of the actual operating frequency f of each cooling water pump 3 is further refined s , and the accuracy of the adjustment of the actual operating frequency f of each cooling water pump 3 is improved s to ensure the effective delivery of cooling water by the cooling water pump 3.

[0139] Specifically, when the actual temperature difference average value ΔT s is higher than the set value ΔT of the cooling water temperature difference i , and the difference between the actual temperature difference average value ΔT s and the set value ΔT of the cooling water temperature difference i is greater than 0.5 °C, then increase the frequency of the cooling water pump 3 so that the difference between the actual temperature difference average value ΔT s and the set value ΔT of the cooling water temperature difference i is less than 0.5 °C.

[0140] Specifically, when the actual temperature difference average value ΔT s is higher than the set value ΔT of the cooling water temperature difference i by 0.5 °C, it means that the cooling water supply of a certain or some water-cooled units 2 is insufficient and more cooling water is needed. Therefore, increase the frequency of the cooling water pump 3 to make it deliver more cooling water so that the difference between the actual temperature difference average value ΔT s and the set value ΔT of the cooling water temperature difference i is less than 0.5 °C.

[0141] Specifically, when the actual average temperature difference ΔT s is lower than the set value of the cooling water temperature difference ΔT i and the difference between the set value of the cooling water temperature difference ΔT i and the actual average temperature difference ΔT s is greater than 0.5 °C, the frequency of the cooling water pump 3 is lowered so that the difference between the actual average temperature difference ΔT s and the set value of the cooling water temperature difference ΔT i is less than 0.5 °C.

[0142] Specifically, when the actual average temperature difference ΔT s is lower than the set value of the cooling water temperature difference ΔT i by 0.5 °C, it indicates that the cooling water supply of the water-cooled unit 2 is sufficient and the flow rate of the cooling water is relatively excessive. Therefore, the frequency of the cooling water pump 3 is lowered to reduce the flow rate of the cooling water it conveys, so that the difference between the actual average temperature difference ΔT s and the set value of the cooling water temperature difference ΔT i is less than 0.5 °C.

[0143] According to an embodiment of the present application, on the other hand, a cooling system is also provided, as shown in Figure 2 and includes:

[0144] a cooling device 1;

[0145] a plurality of water-cooled units 2, each water-cooled unit 2 is respectively connected to the cooling device 1 through a branch 4, and a continuous regulating valve 5 is provided on each branch 4;

[0146] a first determination module for determining the average value W of the actual total operating power of all water-cooled units 2 in the first time period i ;

[0147] a second determination module for determining the number of times a of the interruption fault of each water-cooled unit 2 in the second time period;

[0148] a third determination module for determining the correction coefficient b of each water-cooled unit 2 according to the number of times a of the interruption fault;

[0149] a control module for adjusting the opening degrees of the respective continuous regulating valves 5 according to the average value W i , the rated total operating power W of all water-cooled units 2 e and the correction coefficient b.

[0150] In this embodiment, the first determination module determines the average value W of the actual total operating power of all water-cooled units 2 in the first time period i, the second determination module determines the number of times a of the flow interruption fault of each water-cooled unit 2 within the second time period, and the third determination module determines the correction coefficient b of each water-cooled unit 2 according to the number of times a of the flow interruption fault. Through the formula and calculate the opening degree of the corresponding continuous regulating valve 5. Continuously regulate the flow rate of the cooling water on its branch 4 through the continuous regulating valve 5 to meet the demand of the corresponding water-cooled unit 2 for the cooling water flow rate, improve the balance of the cooling water flow rate distribution, and prevent problems such as local hydraulic imbalance and pipeline oscillation.

[0151] In some embodiments, the second time period may be the time period of 168 hours before the moment when the number of times a of the flow interruption fault is determined. Within this time period, the number of times of the flow interruption fault of the cooling water flow switch of the water-cooled unit 2 is counted.

[0152] It should be noted that the flow interruption fault of the cooling water flow switch of the water-cooled unit 2 means that the flow rate supplied to the water-cooled unit 2 is less than the minimum flow rate required by it. Each time the above situation occurs, a flow interruption fault is recorded.

[0153] In some embodiments, the initial value of the correction coefficient is set to zero.

[0154] In some embodiments, the load factor of multiple water-cooled units 2 corresponding to multiple continuous regulating valves 5 is detected once every ten seconds, and the total load factor is obtained by summing. Then, the actual total operating power is obtained through the total load factor, and the average value W of the actual total operating power within the first time period is calculated i .

[0155] In some embodiments, the first time period may be the time period of 10 minutes before the moment when the load factor of the water-cooled unit 2 is detected.

[0156] Next, taking an embodiment as an example, in combination with Figures 1 to 3 elaborate on the above all solutions comprehensively.

[0157] According to the average value T1 of the evaporation temperature and the average value T2 of the condensation temperature of all water-cooled units 2 within the first time period, the average value η1 is obtained; according to the average value α of the load factors of all water-cooled units 2, the average value η2 of the internal efficiencies of all water-cooled units 2 is obtained; according to the average value η1, the average value η2, the set value ΔT of the cooling water temperature difference i and the average value W i obtain the current total cooling water flow value Q i . The calculated current total cooling water flow value Q i can reflect the current required cooling water flow rate, so that the cooling water flow rate within the entire cooling system reaches balance.

[0158] The cooling device 1 transports the cooling water to each water-cooled unit 2 along the cooling water outlet direction X through the cooling water outlet pipeline 6 and each branch 4. After heat exchange in the water-cooled unit 2, the cooling water returns to the cooling device 1 along the cooling water return direction Y and through the corresponding branch 4 and the cooling water return pipeline 7.

[0159] Based on the current total cooling water flow rate value Q i , the target number of operating units n of the cooling water pumps 3 capable of transporting the current total cooling water flow rate value Q i is calculated. i The actual number of operating units n of the cooling water pumps 3 s is adjusted to the target number of operating units n of the cooling water pumps 3 i， to ensure that the current total cooling water flow rate value Qi can be fully transported to multiple water-cooled units 2, avoiding insufficient cooling water flow rate transported to the water-cooled units 2, which may lead to a decrease in the efficiency of the water-cooled units 2.

[0160] After determining the actual number of operating units n of the cooling water pumps 3 s , the target operating frequency f of each cooling water pump 3 is calculated i so that each cooling water pump 3 operates according to the target operating frequency f of each cooling water pump 3 i to distribute the current cooling water to each cooling water pump 3, preventing large local pressure deviations of the cooling water in the cooling system pipeline due to different frequencies of the cooling water pumps 3, which may lead to system instability.

[0161] According to the actual temperature difference mean ΔT between the outlet temperature and the return temperature of the cooling water s , the actual operating frequency f of each cooling water pump 3 is adjusted s to ensure that the outlet temperature and the return temperature are within a reasonable range, indicating that when each cooling water pump 3 operates at the frequency f s , it can ensure that the cooling water is fully transported to the water-cooled units 2, ensuring that each water-cooled unit 2 can obtain an appropriate flow rate of cooling water to ensure its stable and normal operation.

[0162] Although the embodiments of the present application are described with reference to the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations fall within the scope defined by the appended present application.

Claims

1. A control method for a cooling system, characterized in that, The cooling system includes a cooling device (1) and a plurality of water-cooled units (2). Each of the water-cooled units (2) is respectively connected to the cooling device (1) through a branch (4), and a continuous regulating valve (5) is provided on each of the branches (4); The control method includes: Determine the mean value W of the total actual operating power of all water-cooled units (2) during the first time period i ; Determine the number of times a of the interruption fault of each water-cooled unit (2) within the second time period; Determine the correction coefficient b of each water-cooled unit (2) according to the number of times a of the interruption fault; According to the mean value W i , the total rated operating power W of all water-cooled units (2) e and the correction factor b, adjust the opening degrees of the respective continuous regulating valves (5).

2. The control method of the cooling system according to claim 1, wherein It further includes: According to the mean value W i and the rated water flow rate of each cooling water pump (3), determine the target number of operating cooling water pumps (3) n i ; Adjust the actual number of operating units n of the cooling water pump (3) s to the target number of operating units ni of the cooling water pump (3).

3. The control method of the cooling system according to claim 2, characterized in that, The actual number of operating units n of the cooling water pump (3) s is adjusted to the target number of operating units n of the cooling water pump (3) i After that, the method further includes the steps of: Determine the target operating frequency f of each cooling water pump (3) i ; Determine the target operating frequency f of each cooling water pump (3) i and the actual operating frequency f of each cooling water pump (3) s to obtain the first difference Judge whether the first difference is less than a preset difference; If so, maintain the actual operating frequency f of each cooling water pump (3) s ; If not, adjust the actual operating frequency f of each cooling water pump (3) s to the target operating frequency f of each cooling water pump (3) i .

4. The control method of the cooling system according to claim 3, characterized in that, The determination of the target operating frequency f of each cooling water pump (3) i , includes the steps of: Determine the current total cooling water flow rate value Q i ; According to the flow attenuation coefficient ε of the parallel operation of the cooling water pumps (3), the current total cooling water flow value Q i and the target number of operating units n of the cooling water pumps (3) i , determine the target operating frequency f of each cooling water pump (3) i .

5. The control method of the cooling system according to claim 4, wherein, The determination of the current total cooling water flow rate value Q i , includes the steps of: Determine the average value η1 of the external efficiency of all the water-cooled units (2) within the first time period; Determine the average value η2 of the internal efficiency of all the water-cooled units (2) within the first time period; Based on the mean value η1, the mean value η2, and the set value ΔT of the cooling water temperature difference i and the mean value W i , determine the current total cooling water flow rate value Q i .

6. The control method of the cooling system according to claim 5, wherein, The determination of the average value η1 of the external efficiency of all the water-cooled units (2) within the first time period includes: Determine the average value η1 according to the average evaporation temperature T1 and the average condensation temperature T2 of all the water-cooled units (2) within the first time period.

7. The control method of the cooling system according to claim 5 or 6, characterized in that, The determination of the average value η2 of the internal efficiency of all the water-cooled units (2) within the first time period includes: Determine the average value η2 according to the average load factor α of all the water-cooled units (2) within the first time period.

8. The control method of the cooling system according to claim 3, characterized in that, It further includes: Determine the actual average temperature difference ΔT between the outlet water temperature and the return water temperature of the cooling water during the third time period s ; Determine the actual average temperature difference ΔT s and the set value of the cooling water temperature difference ΔT i Whether the first absolute value of the difference is less than the preset value T of the cooling water temperature difference y ; If so, keep the actual operating frequency f of each cooling water pump (3) s unchanged; If not, adjust the actual operating frequency f of each cooling water pump (3). s .

9. The control method of the cooling system according to claim 8, wherein Adjusting the actual operating frequency f of each cooling water pump (3) s comprises the steps of: Determine the average value of the actual temperature difference ΔT s Higher than the set value of the cooling water temperature difference ΔT i Under the condition, increase the actual operating frequency f of each cooling water pump (3) s ; Determine the actual average temperature difference ΔT s Lower than the set value of the cooling water temperature difference ΔT i Under such conditions, lower the actual operating frequency f of each cooling water pump (3) s .

10. A cooling system, characterized in that, It includes: Cooling device (1); A plurality of water-cooled units (2). Each of the water-cooled units (2) is respectively connected to the cooling device (1) through a branch (4), and a continuous regulating valve (5) is provided on each of the branches (4); The first determination module determines the average value W of the total actual operating power of all water-cooled units (2) within the first time period i ; A second determination module for determining the number of times a of the interruption fault of each water-cooled unit (2) within the second time period; A third determination module for determining the correction coefficient b of each water-cooled unit (2) according to the number of times a of the interruption fault; The control module, according to the mean value W i and the total rated operating power W of all water-cooled units (2) e and the correction coefficient b, adjust the opening degrees of the respective continuous regulating valves (5).

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