Energy-saving control method of liquid cooling system and liquid cooling system

Abstract

The invention discloses an energy-saving control method of a liquid cooling system and the liquid cooling system.The liquid cooling system is provided with a liquid supply header pipe, a liquid return header pipe and a plurality of refrigeration modules connected between the liquid supply header pipe and the liquid return header pipe in parallel, and the energy-saving control method comprises the steps that the temperature of the liquid supply header pipe and the actual total energy efficiency C of the liquid cooling system are collected; when the temperature of the liquid supply header pipe is in the target liquid supply interval, whether the actual total energy efficiency C is smaller than a set value a or not is judged; if not, an energy-saving optimization strategy is executed, and the refrigeration module with the lowest energy efficiency is selected for compressor frequency reduction; and if yes, a forced energy-saving strategy is executed, the refrigeration module with the lowest energy efficiency is selected for compressor frequency reduction, and the refrigeration module with the highest energy efficiency is selected for compressor frequency increasing. According to the invention, the operation state of the control target is adjusted through coordinated control of each refrigeration module, so that the effect of improving the energy efficiency performance of the system is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid cooling systems, and in particular to an energy-saving control method for a liquid cooling system and a liquid cooling system. Background Art

[0002] Liquid cooling technology is a heat dissipation method that uses liquid as a heat transfer medium to remove heat from heating devices through circulation. Compared with traditional air cooling technology, liquid cooling technology has the advantages of higher heat conduction efficiency, smaller size and weight, and lower noise, and is widely used in various fields.

[0003] In application scenarios with high requirements for cooling, a liquid cooling system with multiple parallel refrigeration modules is commonly used. Taking the energy storage battery pack as an example, usually, a set of energy storage battery packs requires 6 to 8 refrigeration modules to cool them together. The coolant that has been cooled by the refrigeration module flows to the cooling plate of the energy storage battery pack, taking away the heat generated by the energy storage battery pack.

[0004] During actual operation, the heat generated by the energy storage battery pack may change dynamically. The existing control scheme is to simultaneously adjust all refrigeration modules in the liquid cooling system or individually adjust certain refrigeration modules in the liquid cooling system. When the system detects that the required cooling capacity is reduced, all refrigeration modules are controlled to reduce the frequency at the same time or reduce the frequency of the corresponding refrigeration module. When the system detects that the required cooling capacity is increased, all refrigeration modules are controlled to increase the frequency at the same time or increase the frequency of the corresponding refrigeration module.

[0005] The above existing control schemes are all guided by the required cooling capacity of the energy storage battery pack. After the cooling capacity demand is met, the operating status of the liquid cooling system is usually no longer adjusted, the cooling resources cannot be reasonably allocated, and the energy efficiency performance of the system needs to be improved.

[0006] Therefore, how to perform joint control and adjustment on the refrigeration modules in the liquid cooling system while meeting the required cooling capacity to achieve energy-saving operation of the system is a technical problem that needs to be solved urgently in the industry. Summary of the invention

[0007] In order to solve the defect of low energy efficiency performance of existing liquid cooling systems, the present invention proposes an energy-saving control method and a liquid cooling system for a liquid cooling system. The energy-saving control method coordinates and controls each refrigeration module and adjusts the operating state of the control target to achieve the effect of improving the energy efficiency performance of the system.

[0008] The technical solution adopted by the present invention is to design an energy-saving control method for a liquid cooling system, wherein the liquid cooling system has a liquid supply main pipe and a liquid return main pipe, and a plurality of refrigeration modules connected in parallel between the liquid supply main pipe and the liquid return main pipe. The energy-saving control method comprises:

[0009] Collect the temperature of the liquid supply main pipe of the liquid cooling system and the actual total energy efficiency C;

[0010] When the temperature of the liquid supply main pipe is in the target liquid supply range, determine whether the actual total energy efficiency C is less than the set value a;

[0011] If not, the optimized energy-saving strategy is executed, and the refrigeration module with the lowest energy efficiency is selected to reduce the compressor frequency;

[0012] If so, a mandatory energy-saving strategy is executed, selecting the refrigeration module with the lowest energy efficiency to reduce the frequency of the compressor and selecting the refrigeration module with the highest energy efficiency to increase the frequency of the compressor.

[0013] Further, selecting the refrigeration module with the lowest energy efficiency to reduce the frequency of the compressor includes:

[0014] Detect the actual stand-alone energy efficiency Cx of each cooling module and find the cooling module with the lowest energy efficiency as the target frequency reduction module;

[0015] The target frequency reduction module is frequency-reduced, and the actual single-machine temperature difference △Tx of the target frequency reduction module is detected to determine whether △Tx ≥ △T, where △Tx is the return liquid temperature of the target frequency reduction module minus the supply liquid temperature, and △T is the return liquid main pipe temperature of the liquid cooling system minus the supply liquid main pipe temperature;

[0016] If yes, return to the step of down-converting the target down-converting module;

[0017] If not, the target frequency reduction module stops frequency reduction.

[0018] Further, selecting the refrigeration module with the lowest energy efficiency to reduce the frequency of the compressor also includes: the target frequency reduction module is marked after stopping the frequency reduction, and each time the waiting period S is set 周期 Re-search the cooling module with the lowest energy efficiency among the unmarked cooling modules as the target frequency reduction module.

[0019] Furthermore, the frequency reduction of the target frequency reduction module each time is △F, the interval between the two adjustments of the target frequency reduction module is △S, and the cycle time is set F max To set the maximum frequency, F min To set the minimum frequency; wherein, after the target frequency reduction module is frequency reduced, the compressor frequency of the target frequency reduction module is not lower than the set minimum frequency.

[0020] Furthermore, selecting the most energy-efficient refrigeration module for compressor frequency increase includes:

[0021] Detect the actual stand-alone energy efficiency Cx of each cooling module and find the cooling module with the highest energy efficiency as the target frequency-upgrading module;

[0022] Upgrade the target frequency-upgrading module and determine whether C n <C n+1 , Cn+1 is the actual total energy efficiency of the liquid cooling system after this adjustment, C n The actual total energy efficiency of the liquid cooling system after the previous adjustment;

[0023] If yes, return to the step of upscaling the target upscaling module;

[0024] If not, the target frequency increase module is restored to the compressor frequency before this adjustment.

[0025] Furthermore, selecting the most energy-efficient refrigeration module for compressor frequency increase also includes:

[0026] After the target frequency-upgrading module is frequency-upgraded, the actual condensing temperature T of the target frequency-upgrading module is obtained. 冷凝 , according to the actual condensation temperature T 冷凝 The size of the target frequency-increasing module is used to adjust the condensing fan frequency, and then determine whether C n <C n+1 .

[0027] Furthermore, according to the actual condensation temperature T 冷凝 The size adjustment target of the condensing fan frequency of the frequency-increasing module includes:

[0028] Calculate the actual condensation temperature difference △T 冷凝 , △T 冷凝 =T 冷凝 -T 维持 , T 维持 To set the condensation temperature;

[0029] The actual condensing temperature difference △T is obtained from the comparison relationship between the preset condensing temperature difference and the frequency change 冷凝 The corresponding target frequency change;

[0030] The condensing fan of the target frequency-increasing module is adjusted according to the target frequency change.

[0031] Further, selecting the most energy-efficient refrigeration module for compressor frequency increase also includes: after the target frequency increase module is restored to the compressor frequency before the current adjustment, it is marked, and each time the waiting period S is set 周期 Find the cooling module with the highest energy efficiency among the unmarked cooling modules again as the target frequency-upgrading module.

[0032] Furthermore, the frequency reduction of the target frequency increasing module each time is △F, the interval between the two adjustments of the target frequency increasing module is △S, and the cycle time is set F max To set the maximum frequency, F min To set the minimum frequency; wherein, after the target frequency-up module is frequency-up, the compressor frequency of the target frequency-up module is not higher than the set maximum frequency.

[0033] In some embodiments, the actual total energy efficiency Actual single unit energy efficiency of cooling module Among them, △T is the return liquid main pipe temperature of the liquid cooling system minus the supply liquid main pipe temperature, Q is the total power of the liquid cooling system, △Tx is the return liquid temperature of the cooling module minus the supply liquid temperature, Qx is the single machine power of the cooling module, and n is the number of cooling modules in the liquid cooling system.

[0034] The present invention also proposes a liquid cooling system, comprising: a liquid supply main pipe and a liquid return main pipe, and a plurality of refrigeration modules connected in parallel between the liquid supply main pipe and the liquid return main pipe. The controller of the liquid cooling system executes the above energy-saving control method.

[0035] Furthermore, the liquid cooling system also includes: a cooling plate that contacts and exchanges heat with the heating element, and a cooling pipe of the cooling plate is connected in series between the liquid supply main pipe and the liquid return main pipe.

[0036] Compared with the prior art, the present invention has at least one of the following beneficial effects:

[0037] 1. Under the condition of meeting the required cooling capacity, different energy-saving strategies are selected according to the actual total energy efficiency of the liquid cooling system, and each cooling module in the liquid cooling system is coordinated and controlled to adjust the operating status of the control target to achieve the effect of improving the energy efficiency performance of the system;

[0038] 2. Select the cooling module with the lowest energy efficiency for frequency reduction, reduce the proportion of the cooling capacity of the cooling module in the total cooling capacity of the liquid cooling system, and improve the energy efficiency performance of the liquid cooling system; and / or select the cooling module with the highest energy efficiency for frequency increase, increase the proportion of the cooling capacity of the cooling module in the total cooling capacity of the liquid cooling system, and improve the energy efficiency performance of the liquid cooling system;

[0039] 3. When looking for control targets, exclude refrigeration modules that have been adjusted, so that each refrigeration module in the liquid cooling system has the opportunity to be adjusted and optimized. As each module is gradually optimized, the energy efficiency performance of the entire system is improved, and the reliability and stability of the system reach the best state. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The present invention is described in detail below with reference to the embodiments and accompanying drawings, wherein:

[0041] Figure 1 is a connection schematic diagram of the liquid cooling system of the present invention;

[0042] Figure 2 is a connection diagram of the refrigeration module of the present invention;

[0043] Figure 3 It is a flow chart of the energy-saving control method of the present invention;

[0044] Figure 4It is a schematic diagram of the flow of frequency reduction control of the present invention;

[0045] Figure 5 It is a schematic diagram of the process of frequency up-conversion control of the present invention;

[0046] Description of the drawings: 1. Refrigeration module; 11. Compressor; 12. Condenser; 121. Condensing fan; 13. Throttling element; 14. Evaporator; 141. Liquid supply branch pipe; 142. Liquid return branch pipe; 15. Gas-liquid separator; 16. Liquid pump; 2. Liquid supply main pipe; 3. Liquid return main pipe; 4. Heating element; 5. Cooling plate. DETAILED DESCRIPTION

[0047] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0048] like Figure 1 , 2 As shown, the energy-saving control method proposed in the present invention is applicable to a liquid cooling system, which includes a cooling liquid circulation loop and a plurality of refrigeration modules 1 for supplying cooling to the cooling liquid circulation loop.

[0049] Specifically, the refrigeration module 1 includes a compressor 11, a condenser 12, a throttling element 3 and an evaporator 14. The refrigerant is sent out from the exhaust port of the compressor 1, passes through the condenser 12, the throttling element 13 and the evaporator 14 in sequence, and then passes through the gas-liquid separator 15 and returns to the suction port of the compressor 11. The compressor 11 provides power for the flow of the refrigerant.

[0050] The coolant circulation loop includes a liquid supply main pipe 2 and a liquid return main pipe 3. The evaporator 14 of the refrigeration module 1 is connected in parallel between the liquid supply main pipe 2 and the liquid return main pipe 3. The coolant flowing out of the liquid return main pipe 3 is sent to the evaporator 14 of the refrigeration module 1 for cooling, and then flows into the liquid supply main pipe 2, and then the low-temperature coolant is sent out by the liquid supply main pipe 2.

[0051] Generally speaking, the evaporator 14 of the refrigeration module 1 adopts a plate heat exchanger. The evaporator 14 has two heat exchange tubes. The first heat exchange tube is used to circulate the refrigerant, and the second heat exchange tube is used to circulate the cooling liquid. The outlet of the second heat exchange tube is connected to the liquid supply main pipe 2 through the liquid supply branch pipe 141, and the inlet of the second heat exchange tube is connected to the liquid return main pipe 3 through the liquid return branch pipe 142. The second heat exchange tube is also connected to a liquid pump 16 that provides power for the flow of the cooling liquid. The cold energy generated by the refrigeration module 1 is exchanged with the cooling liquid at the evaporator 14 to cool the cooling liquid.

[0052] Based on a liquid cooling system with multiple refrigeration modules in parallel, the energy-saving control method of the present invention performs joint control and adjustment on the refrigeration modules in the liquid cooling system while meeting the required refrigeration capacity to achieve energy-saving operation of the system. The control logic is described in detail below.

[0053] like Figure 3 As shown, the energy-saving control method includes:

[0054] Collect the temperature of the liquid supply main pipe of the liquid cooling system and the actual total energy efficiency C;

[0055] When the temperature of the liquid supply main pipe is in the target liquid supply range, it means that the liquid supply temperature of the liquid cooling system meets the cooling demand. In this state, the energy efficiency performance of the system can be improved by reasonably allocating cooling resources. Therefore, first determine whether the actual total energy efficiency C is less than the set value a. The set value a is generally the minimum value required by the national standard, such as 1.6;

[0056] If not, it means that the total energy efficiency of the liquid cooling system meets the energy efficiency requirements. The optimized energy-saving strategy is implemented to select the refrigeration module with the lowest energy efficiency to reduce the frequency of the compressor, reduce the proportion of the refrigeration capacity of the refrigeration module in the total refrigeration capacity of the liquid cooling system, and improve the energy efficiency performance of the liquid cooling system;

[0057] If so, it means that the total energy efficiency of the liquid cooling system has not met the energy efficiency requirements. A mandatory energy-saving strategy is implemented, in which the refrigeration module with the lowest energy efficiency is selected to reduce the frequency of the compressor and the refrigeration module with the highest energy efficiency is selected to increase the frequency of the compressor. The proportion of the cooling capacity of the low-efficiency refrigeration module in the total cooling capacity of the liquid cooling system is reduced, and the proportion of the cooling capacity of the high-efficiency refrigeration module in the total cooling capacity of the liquid cooling system is increased, so as to rapidly improve the energy efficiency performance of the liquid cooling system.

[0058] The benefit of this design is that while meeting the required cooling capacity, different energy-saving strategies are selected based on the actual total energy efficiency of the liquid cooling system, and coordinated control is performed on each cooling module in the liquid cooling system to adjust the operating status of the control target. The cooling module with the lowest energy efficiency is selected for frequency reduction and / or the cooling module with the highest energy efficiency is selected for frequency increase, so as to achieve the effect of improving the energy efficiency performance of the system.

[0059] It should be understood that during the execution of the energy-saving strategy, if the temperature of the liquid supply main exceeds the target liquid supply range, the energy-saving strategy is stopped and the liquid cooling system is adjusted based on the required cooling capacity.

[0060] like Figure 4 As shown, in some embodiments of the present invention, selecting the refrigeration module with the lowest energy efficiency to reduce the frequency of the compressor includes:

[0061] Detect the actual stand-alone energy efficiency Cx of each cooling module and find the cooling module with the lowest energy efficiency as the target frequency reduction module;

[0062] The target frequency reduction module is frequency-reduced, and the actual single-machine temperature difference △Tx of the target frequency reduction module is detected to determine whether △Tx ≥ △T, where △Tx is the return liquid temperature of the target frequency reduction module minus the supply liquid temperature, and △T is the return liquid main pipe temperature of the liquid cooling system minus the supply liquid main pipe temperature;

[0063] If yes, it means that the output cooling capacity of the target frequency reduction module is too large, and the process returns to the step of reducing the frequency of the target frequency reduction module, and continues to reduce the proportion of the cooling capacity of the cooling module in the total cooling capacity of the liquid cooling system, so as to improve the energy efficiency performance of the liquid cooling system;

[0064] If not, it means that the target frequency reduction module outputs an appropriate cooling capacity, and the target frequency reduction module stops reducing the frequency to maintain the energy efficiency performance of the liquid cooling system, avoiding excessive adjustment of the target frequency reduction module to cause the liquid supply main pipe temperature to exceed the target liquid supply range.

[0065] The principle of this design is that the cooling modules in the liquid cooling system are connected in parallel between the liquid supply main pipe and the liquid return main pipe, and the return liquid temperature sent to each cooling module is the same. Therefore, the lower the liquid supply temperature, the greater the actual single-machine temperature difference △Tx. △Tx ≥ △T means that the cooling capacity of the target frequency reduction module exceeds the average cooling capacity of the liquid cooling system, and △Tx < △T means that the cooling capacity of the target frequency reduction module does not exceed the average cooling capacity of the liquid cooling system. On this basis, when the cooling capacity of the cooling module with the lowest energy efficiency is higher than or equal to the average cooling capacity of the liquid cooling system, it means that the cooling module accounts for a large proportion, and the frequency reduction adjustment is performed to improve the energy efficiency performance of the liquid cooling system.

[0066] In some embodiments of the present invention, in the control logic of selecting the refrigeration module with the lowest energy efficiency to reduce the frequency of the compressor, when it is determined that the target frequency reduction module stops reducing the frequency, it means that the target frequency reduction module has been adjusted, and the target frequency reduction module is marked, and each time the waiting period S is set 周期 Re-search the cooling module with the lowest energy efficiency among the unmarked cooling modules as the target frequency reduction module.

[0067] The purpose of this design is to exclude the refrigeration modules that have been adjusted when searching for the control target, so that each refrigeration module in the liquid cooling system has the opportunity to be adjusted and optimized, avoiding the situation where a single refrigeration module is repeatedly adjusted and the compressor frequency in the same system varies too much. As the modules in the liquid cooling system are gradually optimized, the energy efficiency performance of the entire system is improved, and the reliability and stability of the system are optimal.

[0068] It should be understood that in the process of executing energy-saving strategies (including optimized energy-saving strategies and forced energy-saving strategies), the frequency reduction limit of the target frequency reduction module is the set minimum frequency, that is, when the compressor frequency of the target frequency reduction module drops to the set minimum frequency or it is determined that the target frequency reduction module stops reducing the frequency, the compressor frequency of the refrigeration module will no longer be adjusted and the current frequency will be maintained.

[0069] Based on the search logic of the target frequency reduction module mentioned above, the preferred solution is to reasonably set the set cycle time S 周期 Specifically, the frequency reduction of the target frequency reduction module each time is △F, the interval between the two adjustments of the target frequency reduction module is △S, and the cycle time is set F max To set the maximum frequency, F min To set the minimum frequency.

[0070] According to the maximum time required for the compressor to adjust from the set maximum frequency to the set minimum frequency, the set cycle time S between the two searches for the target frequency reduction module is designed. 周期 , which can ensure that after the current target frequency reduction module is selected, the target frequency reduction module has enough time to adjust the compressor frequency to achieve the best performance state - that is, it is determined that the target frequency reduction module stops reducing the frequency, and then the next target frequency reduction module is adjusted to improve control efficiency and accuracy.

[0071] like Figure 5 As shown, in some embodiments of the present invention, selecting the refrigeration module with the highest energy efficiency to perform compressor frequency increase includes:

[0072] Detect the actual stand-alone energy efficiency Cx of each cooling module and find the cooling module with the highest energy efficiency as the target frequency-upgrading module;

[0073] Upgrade the target frequency-upgrading module and determine whether C n <C n+1 , C n+1 is the actual total energy efficiency of the liquid cooling system after this adjustment, C n The actual total energy efficiency of the liquid cooling system after the previous adjustment;

[0074] If yes, it means that increasing the compressor frequency of the target frequency-increasing module can improve the actual total energy efficiency of the liquid cooling system, and the process returns to the step of frequency-increasing the target frequency-increasing module to improve the energy efficiency performance of the liquid cooling system;

[0075] If not, it means that increasing the compressor frequency of the target frequency-upgrading module will lead to a decrease in the actual total energy efficiency of the liquid cooling system. The target frequency-upgrading module is restored to the compressor frequency before this adjustment to maintain the actual total energy efficiency of the liquid cooling system at a high level, avoiding excessive adjustment of the target frequency-upgrading module and resulting in a decrease in the actual total energy efficiency.

[0076] The principle of this design is that the cooling module with the highest energy efficiency operates best, and the cooling module with the lowest energy efficiency operates worst. The reduced cooling capacity of the target frequency reduction module is allocated to the target frequency increase module. While keeping the liquid supply temperature of the liquid cooling system stable, the actual total energy efficiency of the liquid cooling system is optimized and quickly improved to meet the energy efficiency requirements.

[0077] In some embodiments of the present invention, in order to ensure that after adjusting the compressor frequency of the target frequency-up module, the cooling capacity of the target frequency-up module can accurately match the current demand, selecting the refrigeration module with the highest energy efficiency for compressor frequency-up further includes:

[0078] After the target frequency-upgrading module is frequency-upgraded, the actual condensing temperature T of the target frequency-upgrading module is obtained. 冷凝 , according to the actual condensation temperature T 冷凝 The size of the target frequency-increasing module is used to adjust the condensing fan frequency, and then determine whether C n <C n+1 .

[0079] The advantage of this design is that after adjusting the compressor frequency of the target frequency-increasing module, the actual condensing temperature T of the refrigeration module 冷凝 The actual condensation temperature T 冷凝 Maintain it within an appropriate range. Since adjusting the condensing fan frequency has a positive effect on the cooling efficiency of the target frequency-increasing module, after adjusting the condensing fan frequency, it is necessary to determine whether C n <C n+1 The accuracy of the control method can be improved.

[0080] It should be noted that the frequency adjustment logic of the condensing fan can be designed according to the actual application scenario. For example, in some feasible embodiments of the present invention, according to the actual condensing temperature T 冷凝 The size adjustment target of the condensing fan frequency of the frequency-increasing module includes:

[0081] Calculate the actual condensation temperature difference △T 冷凝 , △T 冷凝 =T 冷凝 -T 维持 , T 维持 To set the condensation temperature;

[0082] The actual condensing temperature difference △T is obtained from the comparison relationship between the preset condensing temperature difference and the frequency change 冷凝 The corresponding target frequency change;

[0083] The condensing fan of the target frequency-increasing module is adjusted according to the target frequency change.

[0084] The advantage of this design is that the fan frequency is automatically adjusted through a preset control relationship to ensure that the condenser of the target up-conversion module operates at the optimal efficiency point. When the condensing temperature difference changes, the condensing fan frequency is adjusted in time to avoid overcooling or insufficient cooling, thereby improving the cooling efficiency of the target up-conversion module.

[0085] For ease of understanding, an application example of the present invention is used for illustration.

[0086] According to the calculated actual condensation temperature difference ΔT 冷凝 , adjust the condensing fan frequency according to the following conditions. The interval between two adjustments of the condensing fan frequency must be more than 3 seconds. If the condensing fan frequency rises to the highest frequency, it will maintain the highest frequency. If the condensing fan frequency drops to the lowest frequency, it will maintain the lowest frequency.

[0087] ΔT 冷凝 ≥5℃, the condensing fan frequency increases

ΔF 风机升频1

[0088] 5>ΔT 冷凝 ≥3℃, the condensing fan frequency increases

ΔF 风机升频2

[0089] 3>ΔT 冷凝 ≥1℃, the condensing fan frequency increases

ΔF 风机升频3

[0090] 1>ΔT 冷凝 ≥0℃, the condensing fan frequency increases

ΔF 风机升频4

[0091] 0>ΔT 冷凝 ≥-1℃, the condensing fan maintains the current operating frequency;

[0092] -1>ΔT 冷凝 ≥-2℃, the condensing fan frequency is reduced

ΔF 风机降频1

[0093] ΔT 冷凝 <-2℃, the condensing fan frequency decreases

ΔF 风机降频2

[0094] Where, ΔF 风机升频1 , ΔF 风机升频2 , ΔF 风机升频3 , ΔF 风机升频4 , ΔF 风机降频1 , and ΔF 风机降频2 All of them are used to set the frequency change, and the specific values ​​can be designed according to actual needs.

[0095] In some embodiments of the present invention, in the control logic of selecting the most energy-efficient refrigeration module for compressor frequency increase, when the target frequency increase module is restored to the compressor frequency before the current adjustment, it means that the target frequency increase module has been adjusted, and the target frequency increase module is marked, and each time the waiting period S is set. 周期Find the cooling module with the highest energy efficiency among the unmarked cooling modules again as the target frequency-upgrading module.

[0096] The purpose of this design is to exclude the refrigeration modules that have been adjusted when searching for the control target, so that each refrigeration module in the liquid cooling system has the opportunity to be adjusted and optimized, avoiding the situation where a single refrigeration module is repeatedly adjusted and the compressor frequency in the same system varies too much. As the modules in the liquid cooling system are gradually optimized, the energy efficiency performance of the entire system is improved, and the reliability and stability of the system are optimal.

[0097] It should be understood that in the process of executing energy-saving strategies (including optimized energy-saving strategies and forced energy-saving strategies), the frequency increase limit of the target frequency increase module is the set maximum frequency, that is, when the compressor frequency of the target frequency increase module rises to the set maximum frequency or the target frequency increase module is restored to the compressor frequency before this adjustment, the compressor frequency of the refrigeration module is no longer adjusted and the current frequency is maintained.

[0098] Based on the above target frequency-upgrading module search logic, the preferred solution is to reasonably set the set cycle time S 周期 Specifically, the frequency reduction of the target frequency-up module each time is △F, the interval between the two adjustments of the target frequency-up module is △S, and the cycle time is set. F max To set the maximum frequency, F min To set the minimum frequency.

[0099] According to the maximum time required for the compressor to adjust from the set minimum frequency to the set maximum frequency, the set cycle time S between the two searches for the target frequency-increasing module is designed. 周期 , which can ensure that after the current target frequency-up module is selected, the target frequency-up module has enough time to adjust the compressor frequency to achieve the best performance state - that is, restore the target frequency-up module to the compressor frequency before this adjustment, and then adjust the next target frequency-up module to improve control efficiency and accuracy.

[0100] It should be pointed out that the calculation method of the actual total energy efficiency of the liquid cooling system and the actual single-unit energy efficiency of each cooling module can be designed according to the actual application scenario, for example, the actual total energy efficiency Actual single unit energy efficiency of cooling module △T is the return temperature of the liquid cooling system minus the supply temperature of the liquid cooling system, Q is the total power of the liquid cooling system. △Tx is the return temperature of the cooling module minus the supply temperature, Qx is the single power of the cooling module, and n is the number of cooling modules in the liquid cooling system.

[0101] This design uses the temperature difference between the liquid supply and return liquid of the liquid cooling system and the refrigeration module to represent the cooling capacity, which simplifies the energy efficiency calculation process. Since the refrigeration modules are connected in parallel, the return liquid main pipe temperature and the supply liquid main pipe temperature are the same for all refrigeration modules, so the numerator of the actual total energy efficiency needs to be multiplied by the number of refrigeration modules.

[0102] It should be pointed out that, with respect to the design logic for marking the adjusted refrigeration modules mentioned above, when the temperature of the liquid supply main exceeds the target liquid supply range, the energy-saving strategy is stopped and all refrigeration modules are restored to unmarked; and / or when the temperature of the liquid supply main is in the target liquid supply range but the energy-saving strategy is switched to be executed, all refrigeration modules are also restored to unmarked.

[0103] like Figure 1 As shown, the present invention also proposes a liquid cooling system, including: a liquid supply main pipe 2 and a liquid return main pipe 3, and a plurality of refrigeration modules 1 connected in parallel between the liquid supply main pipe 2 and the liquid return main pipe 3, and a controller of the liquid cooling system executes the above energy-saving control method. Different energy-saving strategies are selected according to the actual total energy efficiency of the liquid cooling system, and each refrigeration module 1 in the liquid cooling system is coordinated and controlled to adjust the operating state of the control target, and the refrigeration module with the lowest energy efficiency is selected for frequency reduction and / or the refrigeration module with the highest energy efficiency is selected for frequency increase, so as to achieve the effect of improving the energy efficiency performance of the system.

[0104] In some embodiments of the present invention, the liquid cooling system further includes: a cooling plate 5 that contacts and exchanges heat with the heating element 4, and the cooling pipe of the cooling plate 5 is connected in series between the liquid supply main pipe 2 and the liquid return main pipe 3, and the heating element 4 includes but is not limited to an energy storage battery pack. By directly contacting the cooling plate 5 with the heating element 4, a large amount of heat can be quickly absorbed and taken away, thereby improving the heat dissipation efficiency. This direct contact method reduces the intermediate links of heat transfer, allowing the heat to be dissipated into the coolant more quickly. The series design of the cooling pipes allows the coolant to form a continuous circulation flow between the liquid supply main pipe 2 and the liquid return main pipe 3. This flow ensures that the coolant can continuously absorb heat from the heating element 4 and take the heat away through the liquid return main pipe 3, thereby maintaining continuous and efficient heat dissipation of the system.

[0105] It should be noted that the terms used above are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. When the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof. The order of execution of actions, steps, etc. in the devices and methods shown in the specification and the accompanying drawings can be implemented in any order as long as there is no special explicit limitation on the order and the output of the previous processing is not used in the subsequent processing. Similar terms of order used for the convenience of description do not mean that they must be implemented in such an order.

[0106] Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods, and apparatus should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0107] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An energy-saving control method for a liquid cooling system, wherein the liquid cooling system comprises a liquid supply main pipe and a liquid return main pipe, and a plurality of refrigeration modules connected in parallel between the liquid supply main pipe and the liquid return main pipe, characterized in that: The energy-saving control method comprises: Collecting the temperature of the liquid supply main pipe and the actual total energy efficiency C of the liquid cooling system; When the temperature of the liquid supply main pipe is in the target liquid supply range, determining whether the actual total energy efficiency C is less than a set value a; If not, the optimized energy-saving strategy is executed, and the refrigeration module with the lowest energy efficiency is selected to reduce the compressor frequency; If so, a mandatory energy-saving strategy is executed, selecting the refrigeration module with the lowest energy efficiency to reduce the frequency of the compressor and selecting the refrigeration module with the highest energy efficiency to increase the frequency of the compressor.

2. The energy-saving control method according to claim 1, characterized in that: Selecting the least efficient cooling module for compressor downclocking includes: Detecting the actual stand-alone energy efficiency Cx of each of the refrigeration modules, and finding the refrigeration module with the lowest energy efficiency as the target frequency reduction module; Down-converting the target frequency reduction module, detecting the actual single-machine temperature difference △Tx of the target frequency reduction module, and judging whether △Tx≥△T, where △Tx is the return liquid temperature of the target frequency reduction module minus the supply liquid temperature, and △T is the return liquid main pipe temperature of the liquid cooling system minus the supply liquid main pipe temperature; If yes, return to the step of down-converting the target down-converting module; If not, the target frequency reduction module stops frequency reduction.

3. The energy-saving control method according to claim 2, characterized in that: Selecting the refrigeration module with the lowest energy efficiency to reduce the frequency of the compressor also includes: the target frequency reduction module is marked after stopping the frequency reduction, and each time waits for a set cycle time S 周期 Re-search the cooling module with the lowest energy efficiency among the unmarked cooling modules as the target frequency reduction module.

4. The energy-saving control method according to claim 3, characterized in that: Each time the frequency reduction of the target frequency reduction module is △F, the interval between the two adjustments of the target frequency reduction module is △S, and the set cycle time is F max To set the maximum frequency, F min To set the minimum frequency; Wherein, after the target frequency reduction module is frequency reduced, the compressor frequency of the target frequency reduction module is not lower than the set minimum frequency.

5. The energy-saving control method according to claim 1, characterized in that: Selecting the most energy efficient cooling module for compressor upscaling includes: Detecting the actual stand-alone energy efficiency Cx of each of the refrigeration modules, and finding the refrigeration module with the highest energy efficiency as the target frequency-upgrading module; The target frequency-upgrading module is frequency-upgraded to determine whether C n <C n+1 , C n+1 is the actual total energy efficiency of the liquid cooling system after this adjustment, C n is the actual total energy efficiency of the liquid cooling system after the previous adjustment; If yes, returning to the step of performing frequency up-conversion on the target frequency up-conversion module; If not, the target frequency increase module is restored to the compressor frequency before the current adjustment.

6. The energy-saving control method according to claim 5, characterized in that: Selecting the most energy-efficient cooling module for compressor upscaling also includes: After the target frequency-upgrading module is frequency-upgraded, the actual condensing temperature T of the target frequency-upgrading module is obtained. 冷凝 , according to the actual condensation temperature T 冷凝 The size of the target frequency-increasing module is adjusted to adjust the condensing fan frequency, and then determine whether C n <C n+1 .

7. The energy-saving control method according to claim 6, characterized in that: According to the actual condensation temperature T 冷凝 The magnitude of the target frequency-upgrading module for adjusting the condensing fan frequency includes: Calculate the actual condensation temperature difference △T 冷凝 , △T 冷凝 =T 冷凝 -T 维持 , T 维持 To set the condensation temperature; The actual condensing temperature difference ΔT is obtained from the comparison relationship between the preset condensing temperature difference and the frequency change. 冷凝 The corresponding target frequency change; The condensing fan of the target frequency increasing module is adjusted according to the target frequency change.

8. The energy-saving control method according to claim 5, characterized in that: Selecting the refrigeration module with the highest energy efficiency to perform compressor frequency increase also includes: the target frequency increase module is marked after it returns to the compressor frequency before the current adjustment, and each time waits for a set cycle time S 周期 Find the cooling module with the highest energy efficiency among the unmarked cooling modules again as the target frequency-upgrading module.

9. The energy-saving control method according to claim 8, characterized in that: Each time the frequency of the target frequency-up module is △F, the interval between the two adjustments of the target frequency-up module is △S, and the set cycle time is F max To set the maximum frequency, F min To set the minimum frequency; Wherein, after the target frequency-up module is frequency-upgraded, the compressor frequency of the target frequency-up module is not higher than the set maximum frequency.

10. The energy-saving control method according to any one of claims 1 to 9, characterized in that: Actual total energy efficiency The actual single-unit energy efficiency of the refrigeration module Among them, ΔT is the return liquid main pipe temperature of the liquid cooling system minus the supply liquid main pipe temperature, Q is the total power of the liquid cooling system, ΔTx is the return liquid temperature of the refrigeration module minus the supply liquid temperature, Qx is the single-machine power of the refrigeration module, and n is the number of refrigeration modules of the liquid cooling system.

11. Liquid cooling system, including: A liquid supply main pipe and a liquid return main pipe, and a plurality of refrigeration modules connected in parallel between the liquid supply main pipe and the liquid return main pipe, characterized in that the controller of the liquid cooling system executes the energy-saving control method according to any one of claims 1 to 10.

12. The liquid cooling system according to claim 11, characterized in that: Also includes: A cooling plate for heat exchange in contact with the heating element, wherein the cooling pipe of the cooling plate is connected in series between the liquid supply main pipe and the liquid return main pipe.

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