Liquid cooling system water pump energy efficiency optimization control method and device and liquid cooling system

Abstract

The application provides a liquid cooling system water pump energy efficiency optimization control method and device and a liquid cooling system. The method comprises the following steps: obtaining a load demand flow of a load; calculating a first energy efficiency parameter of a water pump unit when the water pump unit outputs the load demand flow under a current pump group, and a second energy efficiency parameter of the water pump unit when the water pump unit outputs an energy efficiency optimal flow under the current pump group; determining a target running pump group and a target output flow of the water pump unit; wherein the flow corresponding to the better one of the first energy efficiency parameter and the second energy efficiency parameter is taken as the target output flow of the water pump unit; controlling the water pump unit to run in the target running pump group, and controlling the water pump unit based on the target output flow; and when the target output flow is greater than the load demand flow, controlling the water pump unit to deliver the load demand flow to the load and deliver the remaining flow to a bypass. The application can control the liquid cooling system to run in an energy efficiency optimal state on the basis of meeting the load demand flow, and improve the overall efficiency of the liquid cooling system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of liquid cooling control, and in particular to a water pump energy efficiency optimization control method and device of a liquid cooling system and the liquid cooling system. BACKGROUND

[0002] To ensure the operation temperature of servers in a data center, a liquid cooling system is needed to transmit cooling liquid to the vicinity of the servers to cool them. When transmitting the cooling liquid, the water pump in the liquid cooling system should provide a flow rate corresponding to the load demand flow rate to achieve moderate cooling. The load demand flow rate is affected by parameters such as the server online rate of the data center, and the flow rate provided by the water pump should be the same as the load demand flow rate to achieve good cooling effect and avoid insufficient cooling or excessive cooling.

[0003] However, in the liquid cooling system, the working efficiency of the water pump first increases with the increase of the flow rate, and then decreases with the increase of the flow rate when reaching the energy efficiency optimum point. This results in that when the load demand flow rate is low, the water pump works in a low-frequency working condition, and a professional variable frequency motor needs to be added to the system to reduce the working frequency of the water pump, which increases the cost of the liquid cooling system, and the efficiency of the water pump cannot reach the optimal efficiency value; when the load demand flow rate is high, the working efficiency of the water pump is also lower than the optimal efficiency value. Therefore, in the control process of the liquid cooling system, it is usually difficult to balance the load demand flow rate and the optimal working efficiency. SUMMARY

[0004] Embodiments of the present application provide a water pump energy efficiency optimization control method and device of a liquid cooling system and the liquid cooling system to solve the problem of balancing the load demand flow rate and the optimal working efficiency.

[0005] In a first aspect, embodiments of the present application provide a water pump energy efficiency optimization control method of a liquid cooling system, the liquid cooling system comprising a water pump unit composed of M water pumps, the output end of the water pump unit being connected to a load and a bypass respectively; wherein M≥1 and M is an integer;

[0006] The method comprises:

[0007] Obtaining the load demand flow rate of the load;

[0008] Calculating a first energy efficiency parameter of the water pump unit when outputting the load demand flow rate under the current pump group, and a second energy efficiency parameter of the water pump unit when outputting the energy efficiency optimal flow rate under the current pump group; wherein the pump group is a combination of the water pumps in operation in the water pump unit;

[0009] Determining the target operating pump group and the target output flow rate of the water pump unit; wherein when the target operating pump group is still the current pump group, the flow rate corresponding to the better energy efficiency parameter is taken as the target output flow rate of the water pump unit, the better energy efficiency parameter being the better one of the first energy efficiency parameter and the second energy efficiency parameter;

[0010] controlling the water pump unit to operate in a target operating pump group, and controlling the water pump unit based on a target output flow rate, and when the target output flow rate is greater than the load demand flow rate, controlling the water pump unit to deliver the load demand flow rate to the load and deliver a remaining flow rate to the bypass; wherein the remaining flow rate is a difference between the target output flow rate and the load demand flow rate.

[0011] In a possible implementation, the M water pumps of the water pump unit are identical and connected in parallel to each other, where M≥2.

[0012] Before calculating a first energy efficiency parameter of the water pump unit when outputting the load demand flow rate in the current pump group, and a second energy efficiency parameter of the water pump unit when outputting an energy efficiency optimal flow rate in the current pump group, the method further comprises:

[0013] obtaining a number N of water pumps of the water pump unit operating in the current pump group, where M≥N≥1 and N is an integer, and obtaining the energy efficiency optimal flow rate of the water pump unit in the current pump group.

[0014] In a possible implementation, before determining the target operating pump group and the target output flow rate of the water pump unit, the method further comprises:

[0015] determining, based on the current pump group, an adjacent pump group to be compared; wherein the number of water pumps operating in the adjacent pump group is adjacent to the number of water pumps operating in the current pump group.

[0016] calculating a third energy efficiency parameter of the water pump unit when outputting the load demand flow rate in the adjacent pump group.

[0017] Correspondingly, determining the target operating pump group and the target output flow rate of the water pump unit comprises:

[0018] taking the pump group corresponding to the better energy efficiency parameter and the flow rate as the target operating pump group and the target output flow rate respectively; wherein the better energy efficiency parameter is a better one of the first energy efficiency parameter, the second energy efficiency parameter, and the third energy efficiency parameter.

[0019] In a possible implementation, obtaining the load demand flow rate of the load further comprises:

[0020] obtaining a change direction of the load demand flow rate; wherein the change direction comprises increasing and decreasing.

[0021] Correspondingly, determining, based on the current pump group, the adjacent pump group to be compared comprises:

[0022] if the change direction of the load demand flow rate is increasing, taking a pump group with a number of N+1 water pumps operating as the adjacent pump group to be compared.

[0023] if the change direction of the load demand flow rate is decreasing, taking a pump group with a number of N-1 water pumps operating as the adjacent pump group to be compared.

[0024] In a possible implementation, the adjacent pump set to be compared is determined based on the current pump set, including:

[0025] If the load demand flow is greater than the energy efficiency optimal flow of the current pump set, a pump set with N+1 running pumps is taken as the adjacent pump set to be compared;

[0026] If the load demand flow is less than the energy efficiency optimal flow of the current pump set, a pump set with N-1 running pumps is taken as the adjacent pump set to be compared.

[0027] In a possible implementation, before determining the target running pump set and the target output flow of the water pump unit, further including:

[0028] calculating a fourth energy efficiency parameter of the water pump unit when outputting the energy efficiency optimal flow under the adjacent pump set;

[0029] Correspondingly, the determining the target running pump set and the target output flow of the water pump unit includes:

[0030] taking the pump set corresponding to the better energy efficiency parameter and the flow as the target running pump set and the target output flow respectively; wherein the better energy efficiency parameter is the better one among the first energy efficiency parameter, the second energy efficiency parameter, the third energy efficiency parameter and the fourth energy efficiency parameter.

[0031] In a possible implementation, the energy efficiency parameter includes output power;

[0032] The calculating the first energy efficiency parameter of the water pump unit when outputting the load demand flow under the current pump set and the second energy efficiency parameter of the water pump unit when outputting the energy efficiency optimal flow under the current pump set includes:

[0033] calculating the first output power of the water pump unit when outputting the load demand flow under the N-pump condition based on the flow-power calculation formula of the N pumps of the water pump unit, and taking the first output power as the first energy efficiency parameter, and calculating the second output power of the water pump unit when outputting the energy efficiency optimal flow under the N-pump condition, and taking the second output power as the second energy efficiency parameter; wherein N is the number of running pumps of the water pump unit under the current pump set, N≥1 and N is an integer.

[0034] In a possible implementation, the energy efficiency parameter includes system efficiency;

[0035] The calculating the first energy efficiency parameter of the water pump unit when outputting the load demand flow under the current pump set and the second energy efficiency parameter of the water pump unit when outputting the energy efficiency optimal flow under the current pump set includes:

[0036] In the water pump operation efficiency library, based on the water pump operation frequency corresponding to the load demand flow output by the water pump unit at the N-pump working condition, the operation efficiency of the water pump unit at the load demand flow output at the N-pump working condition is searched and taken as the first energy efficiency parameter, and based on the water pump operation frequency corresponding to the energy efficiency optimal flow output by the water pump unit at the N-pump working condition, the operation efficiency of the water pump unit at the energy efficiency optimal flow output at the N-pump working condition is searched and taken as the second energy efficiency parameter; wherein the water pump operation efficiency library contains the operation efficiency of the water pump unit at different water pump operation quantity working conditions and different water pump operation frequencies, N is the water pump operation quantity of the water pump unit under the current pump group, N is greater than or equal to 1 and is an integer.

[0037] In a second aspect, an embodiment of the present application provides a control device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the steps of the method according to the first aspect or any possible implementation manner of the first aspect when executing the computer program.

[0038] In a third aspect, an embodiment of the present application provides a liquid cooling system, comprising a secondary side circuit and the control device according to the second aspect, the secondary side circuit comprising a main circuit, a bypass circuit, and a water pump unit comprising M water pumps, the output end of the water pump unit being connected to the bypass circuit through a bypass valve and being used to be connected to a load.

[0039] The embodiment of the present application provides a water pump energy efficiency optimization control method and device of a liquid cooling system and the liquid cooling system, the first energy efficiency parameter of a water pump unit of the liquid cooling system when outputting a load demand flow is calculated, and the second energy efficiency parameter of the water pump unit when outputting an energy efficiency optimal flow is calculated, the flow making the energy efficiency parameter more optimal is selected as a target output flow of the water pump unit, and the demand of system energy efficiency optimization is met. Meanwhile, when the target output flow is greater than the load demand flow, the excess flow is output through the bypass circuit to meet the load demand flow. Thus, the present application proposes the possibility that when the load demand flow is less than the energy efficiency optimal flow of the water pump, the liquid cooling system is more energy-saving by outputting the energy efficiency optimal flow of the water pump and returning part of the excess flow through the bypass circuit, and further configures a corresponding optimization control method, uses the obtained load demand flow to optimize the energy efficiency of the two water pump operation modes of directly outputting the load demand flow or outputting the energy efficiency optimal flow combined with the bypass return, so as to find a more optimal operation mode in the field that conforms to the actual engineering situation, so as to control the liquid cooling system to run in the energy efficiency optimal state on the basis of meeting the load demand flow, and improve the overall efficiency of the liquid cooling system. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0041] Figure 1 is the implementation flowchart of the water pump energy efficiency optimization control method of the liquid cooling system provided by an embodiment of the present application;

[0042] Figure 2 is the flow resistance curve of the water pump unit under different water pump running quantities as the flow changes, provided by an embodiment of the present application;

[0043] Figure 3 is the power curve of the water pump unit under different water pump running quantities as the flow changes, provided by an embodiment of the present application;

[0044] Figure 4 is the power and water pump running quantity curve of the water pump unit as the flow changes, provided by an embodiment of the present application;

[0045] Figure 5 is the power and water pump running quantity curve of the water pump unit considering bypass as the flow changes, provided by an embodiment of the present application;

[0046] Figure 6 is the structural schematic diagram of the liquid cooling system, provided by an embodiment of the present application;

[0047] Figure 7 is the structural schematic diagram of the water pump energy efficiency optimization control device of the liquid cooling system, provided by an embodiment of the present application;

[0048] Figure 8 is the schematic diagram of the control device, provided by an embodiment of the present application. DETAILED DESCRIPTION

[0049] In the following description, specific details are set forth in order to provide a thorough understanding of embodiments of the present application. However, persons of ordinary skill in the art will readily recognize that embodiments of the present application can be practiced without these specific details. In other instances, well-known structures, devices, circuits, and methods have not been described in detail in order to avoid obscuring the present application.

[0050] In order to make the objects, technical solutions and advantages of the present application clearer, the following will be described with reference to the drawings through specific embodiments.

[0051] As Figure 6As shown, the liquid cooling system to which the embodiment of the present application is applied comprises a water pump unit composed of M water pumps, and the output ends of the water pump unit are connected with a load and a bypass respectively; wherein M>1 and M is an integer.

[0052] Referring to Figure 1 which shows an implementation flowchart of the water pump energy efficiency optimization control method of the liquid cooling system provided by the embodiment of the present application, and the details are as follows:

[0053] In step 101, the load demand flow of the load is acquired.

[0054] In the present embodiment, in order to ensure the cooling effect, the flow delivered by the water pump to the data center needs to be the same as the load demand flow. The load demand flow is affected by parameters such as the server online rate of the data center. In actual operation, the server online rate of the data center usually does not change in real time, but the load of each server itself may change, resulting in the change of the load demand flow. The load demand flow can be acquired by communicating with the control system of the data center.

[0055] In step 102, the first energy efficiency parameter of the water pump unit when outputting the load demand flow under the current pump group, and the second energy efficiency parameter of the water pump unit when outputting the energy efficiency optimal flow under the current pump group are calculated; wherein the pump group is the combination of the water pumps in operation in the water pump unit.

[0056] In the present embodiment, since the working efficiency of the water pump has a relationship curve with the flow, which is an open downward parabola, there is a flow point that makes the efficiency of the water pump optimal, which is called the energy efficiency optimal flow. When each water pump in operation in the water pump unit outputs its own energy efficiency optimal flow, it is the energy efficiency optimal flow output by the water pump unit under the current pump group.

[0057] However, the energy efficiency optimal flow is usually different from the load demand flow, and the efficiency of the water pump working at the energy efficiency optimal flow is usually better than that working at the load demand flow, so controlling the water pump to work at the energy efficiency optimal flow can ensure the working efficiency of the water pump. However, when the energy efficiency optimal flow is greater than the load demand flow, the flow generated when the water pump works at the energy efficiency optimal flow cannot be directly delivered to the load, otherwise it will cause the temperature of the load to deviate from its control target.

[0058] The energy efficiency parameter in the embodiment is used to evaluate the overall working efficiency of the liquid cooling system, i.e. the overall energy efficiency of the system under the consideration of the flow rate and power utilization rate. Based on this, in the embodiment, for a specific load demand flow rate, the first energy efficiency parameter of the water pump unit when outputting the load demand flow rate under the current pump set and the second energy efficiency parameter of the water pump unit when outputting the energy efficiency optimal flow rate under the current pump set are calculated respectively, and the two energy efficiency parameters are compared, so as to determine which flow rate of the water pump unit has better working efficiency, flow rate and power utilization rate, thereby helping to determine the target output flow rate of the water pump unit and achieving better control effect.

[0059] In step 103, the target running pump set and the target output flow rate of the water pump unit are determined; wherein when the target running pump set is still the current pump set, the flow rate corresponding to the better energy efficiency parameter is taken as the target output flow rate of the water pump unit, and the better energy efficiency parameter is the better one of the first energy efficiency parameter and the second energy efficiency parameter.

[0060] In the embodiment, in order to improve the working efficiency of the water pump unit, the pump set can also be switched, such as increasing or reducing the number of working water pumps, so that the output flow rate of each water pump is closer to the energy efficiency optimal flow rate of the single water pump and the output flow rate of the water pump unit is close to the load demand flow rate, thereby improving the working efficiency, flow rate and power utilization rate of the water pump unit.

[0061] When the pump set is not switched, only the target output flow rate of the water pump unit under the current pump set needs to be determined, and the flow rate corresponding to the better energy efficiency parameter is taken as the target output flow rate of the water pump unit, so as to achieve better control effect.

[0062] In step 104, the water pump unit is controlled to run in the target running pump set and is controlled based on the target output flow rate, and when the target output flow rate is greater than the load demand flow rate, the water pump unit is controlled to deliver the load demand flow rate to the load and deliver the remaining flow rate to the bypass; wherein the remaining flow rate is the difference between the target output flow rate and the load demand flow rate.

[0063] In the embodiment, controlling the water pump unit based on the target output flow rate can achieve better energy efficiency parameter, and at the same time, in order to ensure that the load is moderately cooled, when the target output flow rate is the load demand flow rate, the output flow rate of the water pump unit matches the load demand flow rate, and the water pump unit is controlled according to the existing control scheme, and when the target output flow rate is the energy efficiency optimal flow rate, the target output flow rate can be greater than or equal to the load demand flow rate, and when the target output flow rate is greater than the load demand flow rate, the excess flow rate is output through the bypass and flows back to the input end of the water pump unit, so as to still deliver the load demand flow rate to the load.

[0064] The embodiment of the present application calculates the first energy efficiency parameter of the water pump unit of the liquid cooling system when outputting the load demand flow and the second energy efficiency parameter when outputting the energy efficiency optimal flow, respectively, selects the flow with better energy efficiency parameter as the target output flow of the water pump unit, and meets the system energy efficiency optimal demand. Meanwhile, when the target output flow is greater than the load demand flow, the excess flow is output through the bypass to meet the load demand flow. Thus, the embodiment of the present application proposes the possibility of making the liquid cooling system more energy-saving by outputting the water pump as the energy efficiency optimal flow and returning part of the excess flow through the bypass when the load demand flow is less than the energy efficiency optimal flow of the water pump, and further configures the corresponding optimization control method. The load demand flow is used to optimize the energy efficiency of the two water pump operation modes (referred to as bypass mode) of directly outputting the load demand flow or outputting the energy efficiency optimal flow combined with the bypass return, so as to find the better operation mode in line with the actual engineering situation on site, thereby controlling the liquid cooling system to run in the energy efficiency optimal state on the basis of meeting the load demand flow, and improving the overall efficiency of the liquid cooling system.

[0065] In a possible implementation, the M water pumps of the water pump unit are identical and connected in parallel to each other, where M≥2.

[0066] Before calculating the first energy efficiency parameter of the water pump unit when outputting the load demand flow under the current pump group and the second energy efficiency parameter of the water pump unit when outputting the energy efficiency optimal flow under the current pump group, the method further includes:

[0067] The number N of the water pumps of the water pump unit under the current pump group is obtained, where M≥N≥1 and N is an integer, and the energy efficiency optimal flow of the water pump unit under the current pump group is obtained.

[0068] In the embodiment, the output flow of each water pump under the current pump group is the same, and the sum of the output flows of the water pumps is the output flow of the water pump unit. The energy efficiency optimal flow of the water pump unit under the current pump group is the sum of the energy efficiency optimal flows of the water pumps under the current pump group.

[0069] In addition, when the number of water pumps operating in the water pump unit is multiple, there is parallel loss in the output flow of each water pump, so there is a difference between the sum of the actual flow generated by each water pump and the flow that can be output by the water pump unit to the load. At this time, if the optimal energy efficiency flow of each water pump is controlled and the bypass is opened, the remaining flow output through the bypass = optimal energy efficiency flow - parallel loss flow - load demand flow, which is less than the remaining flow in the single-pump working condition. With more pumps in the multi-pump combination, the parallel loss flow is also higher, and the remaining flow is also less. That is, the utilization rate of flow in the multi-pump working condition is higher, and the working energy efficiency is better than that in the single-pump working condition. In other words, in the multi-pump condition, it is suitable to configure each pump in the water pump unit to output the optimal energy efficiency flow and use the bypass return flow to obtain better energy efficiency parameters and improve the proportion of the flow interval of the system in the entire flow interval of the same pump group. Compared with the proportion in the single-pump condition, the proportion will be larger and wider, that is, the bypass mode is more suitable for more pumps, and the practical application value is higher.

[0070] In a possible implementation, before determining the target operating pump group and the target output flow of the water pump unit, the method further includes:

[0071] determining adjacent pump groups to be compared based on the current pump group; wherein the number of water pumps operating in the adjacent pump groups is adjacent to the number of water pumps operating in the current pump group;

[0072] calculating a third energy efficiency parameter of the water pump unit when outputting the load demand flow in the adjacent pump group;

[0073] Correspondingly, determining the target operating pump group and the target output flow of the water pump unit includes:

[0074] taking the pump group corresponding to the optimal energy efficiency parameter and the flow as the target operating pump group and the target output flow respectively; wherein the optimal energy efficiency parameter is the better one of the first energy efficiency parameter, the second energy efficiency parameter and the third energy efficiency parameter.

[0075] In this embodiment, to improve the working efficiency of the water pump unit, the pump group can also be switched, such as increasing or decreasing the number of water pumps in operation. Figure 2 The curves of the flow resistance of the water pump unit with different numbers of water pumps operating are shown, and it can be seen that Figure 2 that the greater the number of water pumps operating at the same flow, the smaller the flow resistance, and the higher the operating efficiency of the water pump unit. Figure 3 The curves of the power of the water pump unit with different numbers of water pumps operating are shown, and it can be seen that Figure 3 that the power curves of the two pump groups adjacent in the number of water pumps operating have an intersection point, that is, at a certain flow point, the power of the two pump groups adjacent in the number of water pumps operating is the same, and before and after the flow point, there is a pump group with higher power and a pump group with lower power.

[0076] Since the intersection of the power-flow curves of each pump group is difficult to determine, in the embodiment, only the feature that the power-flow curves of two pump groups adjacent in the number of running pumps have an intersection is used, and the energy efficiency parameters of the two pump groups adjacent in the number of running pumps at the same flow (load demand flow) are calculated to find the pump group with better energy efficiency parameters.

[0077] In the embodiment, the current pump group is the pump group with N running pumps, and the adjacent pump groups include the pump group with N+1 running pumps and the pump group with N-1 running pumps. When compared, one or both of the pump group with N+1 running pumps and the pump group with N-1 running pumps can be selected, the third energy efficiency parameter is calculated, and compared with the first energy efficiency parameter and the second energy efficiency parameter.

[0078] In a possible implementation, the load demand flow of the load is obtained, and the method further includes:

[0079] The change direction of the load demand flow is obtained, and the change direction includes increasing and decreasing.

[0080] Correspondingly, the adjacent pump group to be compared is determined based on the current pump group, and the method includes:

[0081] If the change direction of the load demand flow is increasing, the pump group with N+1 running pumps is taken as the adjacent pump group to be compared.

[0082] If the change direction of the load demand flow is decreasing, the pump group with N-1 running pumps is taken as the adjacent pump group to be compared.

[0083] In the embodiment, the current pump group with N running pumps can have two adjacent pump groups, i.e., the pump group with N+1 running pumps and the pump group with N-1 running pumps. Figure 4 A curve diagram of the power of the pump unit and the number of running pumps with the change of the flow is shown, and the flow interval has a corresponding relationship with the number of running pumps. If the change direction of the load demand flow is increasing, based on Figure 4 As shown in the curve, when the flow is large, more running pumps are needed to provide the corresponding flow range, so the pump group with N-1 running pumps can be excluded, the pump group with N+1 running pumps is taken as the adjacent pump group to be compared, and the pump group with N+1 running pumps can provide a wider flow range to prepare for the increase of the load demand flow.

[0084] If the change direction of the load demand flow is decreasing, based on Figure 4As shown in the curve, when the flow is small, a smaller number of pumps needs to be operated to provide the corresponding range of flow, so the pump set with N+1 pumps can be excluded, and the pump set with N-1 pumps can be taken as the adjacent pump set to be compared, and the pump set with N-1 pumps can provide a narrower flow range, which is prepared for the smaller load demand flow.

[0085] In a possible implementation, the adjacent pump set to be compared is determined based on the current pump set, including:

[0086] If the load demand flow is greater than the energy efficiency optimal flow of the current pump set, the pump set with N+1 pumps is taken as the adjacent pump set to be compared;

[0087] If the load demand flow is less than the energy efficiency optimal flow of the current pump set, the pump set with N-1 pumps is taken as the adjacent pump set to be compared.

[0088] In the embodiment, since the flow efficiency curve of the water pump is a downward-opening parabola, to improve the working efficiency of the water pump unit, the output flow of each working water pump in the current pump set should be close to the energy efficiency optimal flow of the single water pump. When the load demand flow is greater than the energy efficiency optimal flow of the current pump set, that is, the output flow allocated to each water pump is greater than the energy efficiency optimal flow of the single water pump, the pump set with N+1 pumps is taken as the adjacent pump set to be compared, so that the number of pumps is increased, and then the output flow allocated to each water pump can be reduced, so that the output flow of each water pump is close to the energy efficiency optimal flow of the single water pump.

[0089] Similarly, when the load demand flow is less than the energy efficiency optimal flow of the current pump set, that is, the output flow allocated to each water pump is less than the energy efficiency optimal flow of the single water pump, the pump set with N-1 pumps is taken as the adjacent pump set to be compared, so that the number of pumps is reduced, and then the output flow allocated to each water pump can be increased, so that the output flow of each water pump is close to the energy efficiency optimal flow of the single water pump.

[0090] In a possible implementation, before determining the target running pump set and the target output flow of the water pump unit, further including:

[0091] calculating a fourth energy efficiency parameter of the water pump unit when the output energy efficiency optimal flow under the adjacent pump set;

[0092] Correspondingly, the determining the target running pump set and the target output flow of the water pump unit includes:

[0093] the pump set corresponding to the better energy efficiency parameter and the flow are taken as the target running pump set and the target output flow respectively; wherein the better energy efficiency parameter is the better one of the first energy efficiency parameter, the second energy efficiency parameter, the third energy efficiency parameter and the fourth energy efficiency parameter.

[0094] In the embodiment, the water pump unit can output a load demand flow rate or an energy efficiency optimal flow rate under the adjacent pump group, and calculating a fourth energy efficiency parameter of the water pump unit when the water pump unit outputs the energy efficiency optimal flow rate under the adjacent pump group can help to select the most suitable target running pump group and target output flow rate.

[0095] It is worth noting that, Figure 2 , 3 , 4 is a curve diagram without considering the bypass mode. After actually considering the bypass mode, Figure 4 the flow rate interval of each pump group will shift, and within the flow rate interval of each pump group itself, finer sub-flow rate intervals will also be differentiated, i.e., sub-flow rate intervals suitable for not starting the bypass mode and sub-flow rate intervals suitable for starting the bypass mode. According to the simulation calculation results of various working conditions by the inventor of the present application, it is roughly as shown in Figure 5 , wherein "single pump (with bypass)" represents the running mode of "single pump (with bypass)", and "double pump (without bypass)" represents the running mode of "double pump (without bypass)". It can be seen that, as the flow rate gradually increases, the preferred water pump unit running mode is in turn: single pump (without bypass), single pump (with bypass), single pump (without bypass), double pump (with bypass), double pump (without bypass), three pump (with bypass), …, N-1 pump (without bypass), N pump (with bypass), N pump (without bypass). Moreover, as the number of N gradually increases, the proportion of the flow rate interval with bypass in the pump group of N pump also gradually increases.

[0096] In a possible implementation, the energy efficiency parameter includes an output power;

[0097] The first energy efficiency parameter of the water pump unit when the water pump unit outputs the load demand flow rate under the current pump group, and the second energy efficiency parameter of the water pump unit when the water pump unit outputs the energy efficiency optimal flow rate under the current pump group, are calculated, comprising:

[0098] The first output power of the water pump unit when the water pump unit outputs the load demand flow rate under the N pump condition is calculated based on the flow rate-power calculation formula of the N pump of the water pump unit, and is taken as the first energy efficiency parameter, and the second output power of the water pump unit when the water pump unit outputs the energy efficiency optimal flow rate under the N pump condition is calculated, and is taken as the second energy efficiency parameter; wherein N is the number of water pumps of the water pump unit under the current pump group, N≥1 and N is an integer.

[0099] In the embodiment, for the water pump unit composed of M water pumps with the same parameters and in parallel with each other, the power of the water pump unit under any pump group of pump operation quantity is a quadratic function of the output flow. The flow-power calculation formula under each pump operation quantity can be pre-set, and for each pump operation quantity and output flow, the corresponding output power of the water pump unit can be calculated, wherein the flow-power calculation formula is the existing calculation method, which is not described herein again. The overall efficiency of the liquid cooling system can be represented as the power obtained by the load / the output power of the water pump unit, and under the condition that the flow delivered to the load is unchanged, it can be known that the smaller the output power of the water pump unit is, the greater the overall efficiency is. Therefore, when the energy efficiency parameter is the output power of the water pump unit, the smaller energy efficiency parameter is the better energy efficiency parameter.

[0100] In a possible implementation, the energy efficiency parameter comprises system efficiency.

[0101] The first energy efficiency parameter of the water pump unit when outputting the load demand flow under the current pump group and the second energy efficiency parameter of the water pump unit when outputting the energy efficiency optimal flow under the current pump group are calculated, comprising:

[0102] In the water pump operation efficiency library, the running efficiency of the water pump unit when outputting the load demand flow under the N pump condition is found based on the water pump running frequency corresponding to the water pump unit outputting the load demand flow under the N pump condition, and is taken as the first energy efficiency parameter, and the running efficiency of the water pump unit when outputting the energy efficiency optimal flow under the N pump condition is found based on the water pump running frequency corresponding to the water pump unit outputting the energy efficiency optimal flow under the N pump condition, and is taken as the second energy efficiency parameter; wherein the water pump operation efficiency library contains the running efficiency of the water pump unit under different pump operation quantity conditions and different water pump running frequencies, N is the water pump operation quantity of the water pump unit under the current pump group, N≥1 and N is an integer.

[0103] In the embodiment, the water pump operation efficiency library containing the running efficiency of the water pump unit under different pump operation quantity and water pump running frequency can be pre-constructed. For each output flow under a certain pump operation quantity, the corresponding water pump running frequency can be determined, so that the running efficiency of the water pump unit when outputting the load demand flow under the N pump condition and the running efficiency of the water pump unit when outputting the energy efficiency optimal flow under the N pump condition can be directly found in the water pump operation efficiency library.

[0104] When the energy efficiency parameter is the running efficiency of the water pump unit, the greater energy efficiency parameter is the better energy efficiency parameter.

[0105] It should be understood that the size of the serial number of each step in the above embodiment does not mean the order of execution, and the execution order of each process should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiment of the present application.

[0106] The following is an embodiment of the device of the present application, for details not described in detail, can refer to the corresponding method embodiment described above.

[0107] Figure 7 The structure diagram of the water pump energy efficiency optimization control device of the liquid cooling system provided by the embodiment of the present application is shown, only the part related to the embodiment of the present application is shown for the convenience of description, and the details are described as follows:

[0108] As Figure 7 The water pump energy efficiency optimization control device 7 of the liquid cooling system is applied to the liquid cooling system, the liquid cooling system includes a water pump unit composed of M water pumps, the output end of the water pump unit is used for connecting with the load and the bypass respectively; wherein, M≥1 and M is an integer;

[0109] The water pump energy efficiency optimization control device 7 of the liquid cooling system includes:

[0110] The acquisition module 71 is used for acquiring the load demand flow of the load;

[0111] The calculation module 72 is used for calculating the first energy efficiency parameter of the water pump unit when outputting the load demand flow under the current pump group, and the second energy efficiency parameter of the water pump unit when outputting the energy efficiency optimal flow under the current pump group; wherein, the pump group is a combination of the water pumps running in the water pump unit;

[0112] The determination module 73 is used for determining the target running pump group and the target output flow of the water pump unit; wherein, when the target running pump group is still the current pump group, the flow corresponding to the better energy efficiency parameter is taken as the target output flow of the water pump unit, and the better energy efficiency parameter is the better one of the first energy efficiency parameter and the second energy efficiency parameter;

[0113] The control module 74 is used for controlling the water pump unit to run in the target running pump group, and controlling the water pump unit based on the target output flow, and when the target output flow is greater than the load demand flow, controlling the water pump unit to deliver the load demand flow to the load and deliver the remaining flow to the bypass; wherein, the remaining flow is the difference between the target output flow and the load demand flow.

[0114] In a possible implementation manner, the M water pumps of the water pump unit are the same and are connected in parallel with each other, wherein, M≥2;

[0115] The calculation module 72 is further used for:

[0116] Before calculating the first energy efficiency parameter of the water pump unit when outputting the load demand flow under the current pump group, and the second energy efficiency parameter of the water pump unit when outputting the energy efficiency optimal flow under the current pump group, the number N of the water pumps running under the current pump group of the water pump unit is acquired, M≥N≥1 and N is an integer, and the energy efficiency optimal flow under the current pump group of the water pump unit is acquired.

[0117] In a possible implementation, the computing module 72 is further configured to:

[0118] Before determining the target running pump group and the target output flow rate of the water pump unit, determine the adjacent pump group to be compared based on the current pump group; wherein the number of running water pumps of the adjacent pump group is adjacent to the number of running water pumps of the current pump group;

[0119] Calculate a third energy efficiency parameter of the water pump unit when outputting the load demand flow rate under the adjacent pump group;

[0120] Correspondingly, the determining module 73 is specifically configured to:

[0121] Take the pump group corresponding to the better energy efficiency parameter as the target running pump group and take the flow rate corresponding to the better energy efficiency parameter as the target output flow rate; wherein the better energy efficiency parameter is the better one of the first energy efficiency parameter, the second energy efficiency parameter and the third energy efficiency parameter.

[0122] In a possible implementation, the obtaining module 71 is further configured to:

[0123] Obtain the change direction of the load demand flow rate; wherein the change direction includes increasing and decreasing;

[0124] Correspondingly, the computing module 72 is specifically configured to:

[0125] If the change direction of the load demand flow rate is increasing, take the pump group with the number of running water pumps being N+1 as the adjacent pump group to be compared;

[0126] If the change direction of the load demand flow rate is decreasing, take the pump group with the number of running water pumps being N-1 as the adjacent pump group to be compared.

[0127] In a possible implementation, the computing module 72 is specifically configured to:

[0128] If the load demand flow rate is greater than the energy efficiency optimal flow rate of the current pump group, take the pump group with the number of running water pumps being N+1 as the adjacent pump group to be compared;

[0129] If the load demand flow rate is less than the energy efficiency optimal flow rate of the current pump group, take the pump group with the number of running water pumps being N-1 as the adjacent pump group to be compared.

[0130] In a possible implementation, the computing module 72 is further configured to:

[0131] Before determining the target running pump group and the target output flow rate of the water pump unit, calculate a fourth energy efficiency parameter of the water pump unit when outputting the energy efficiency optimal flow rate under the adjacent pump group;

[0132] Correspondingly, the determining module 73 is specifically configured to:

[0133] The pump group corresponding to the optimal energy efficiency parameter and the flow are respectively taken as a target running pump group and a target output flow; wherein the optimal energy efficiency parameter is an optimal one of the first energy efficiency parameter, the second energy efficiency parameter, the third energy efficiency parameter and the fourth energy efficiency parameter.

[0134] In a possible implementation, the energy efficiency parameter comprises an output power.

[0135] The calculation module 72 is specifically configured to:

[0136] The first output power of the water pump unit when outputting the load demand flow under the N-pump condition is calculated based on a flow-power calculation formula of N pumps of the water pump unit, and taken as the first energy efficiency parameter, and the second output power of the water pump unit when outputting the energy efficiency optimal flow under the N-pump condition is calculated, and taken as the second energy efficiency parameter; wherein N is the number of water pumps of the water pump unit under the current pump group, N≥1 and N is an integer.

[0137] In a possible implementation, the energy efficiency parameter comprises a system efficiency.

[0138] The calculation module 72 is specifically configured to:

[0139] In the water pump running efficiency library, the running efficiency of the water pump unit when outputting the load demand flow under the N-pump condition is found based on the water pump running frequency corresponding to the load demand flow, and taken as the first energy efficiency parameter, and the running efficiency of the water pump unit when outputting the energy efficiency optimal flow under the N-pump condition is found based on the water pump running frequency corresponding to the energy efficiency optimal flow, and taken as the second energy efficiency parameter; wherein the water pump running efficiency library comprises the running efficiency of the water pump unit under different water pump running quantity conditions and different water pump running frequencies, N is the number of water pumps of the water pump unit under the current pump group, N≥1 and N is an integer.

[0140] The embodiment of the present application calculates the first energy efficiency parameter of the water pump unit of the liquid cooling system when outputting the load demand flow and the second energy efficiency parameter when outputting the energy efficiency optimal flow, respectively, selects the flow with the better energy efficiency parameter as the target output flow of the water pump unit, and meets the demand of optimal system energy efficiency. Meanwhile, when the target output flow is greater than the load demand flow, the excess flow is output through the bypass to meet the load demand flow. The method can control the liquid cooling system to run in the optimal energy efficiency state on the basis of meeting the load demand flow, and improve the overall efficiency of the liquid cooling system.

[0141] Figure 8 is a schematic diagram of the control device provided by the embodiment of the present application. As shown in the figure, Figure 8As shown, the control device 8 of this embodiment includes a processor 80, a memory 81, and a computer program 82 stored in the memory 81 and executable on the processor 80. The processor 80 implements the steps in the water pump energy efficiency optimization control method embodiments of the various liquid cooling systems described above when executing the computer program 82, such as Figure 1 Steps 101 to 104 described above. Alternatively, the processor 80 implements the functions of the various modules / units in the device embodiments described above when executing the computer program 82, such as Figure 7 The functions of the modules / units 71 to 74 described above.

[0142] For example, the computer program 82 can be segmented into one or more modules / units stored in the memory 81 and executed by the processor 80 to complete the present application. The one or more modules / units can be a series of computer program instruction segments capable of completing a specific function, which are used to describe the execution process of the computer program 82 in the control device 8. For example, the computer program 82 can be segmented into Figure 7 The modules / units 71 to 74 described above.

[0143] The control device 8 can be a desktop computer, a notebook, a palm computer, a cloud server, and other computing devices. The control device 8 can include, but is not limited to, a processor 80, a memory 81. Those skilled in the art can understand that Figure 8 The control device 8 is only an example and does not constitute a limitation on the control device 8, and can include more or fewer components than those shown, or combine certain components, or different components, for example, the control device can also include an input / output device, a network access device, a bus, etc.

[0144] The processor 80 can be a central processing unit (CPU), and can also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor.

[0145] The memory 81 can be an internal storage unit of the control device 8, for example, a hard disk or a memory of the control device 8. The memory 81 can also be an external storage device of the control device 8, for example, a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. equipped on the control device 8. Further, the memory 81 can also include both the internal storage unit and the external storage device of the control device 8. The memory 81 is used to store the computer program and other programs and data required by the control device. The memory 81 can also be used to temporarily store data that has been output or is to be output.

[0146] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the above-mentioned division of each functional unit and module is exemplified, and in actual application, the above-mentioned functions can be completed by different functional units and modules according to needs, that is, the internal structure of the device is divided into different functional units or modules to complete all or part of the above-described functions. Each functional unit and module in the embodiment can be integrated in one processing unit, or each unit can be physically present separately, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or software. In addition, the specific names of each functional unit and module are only for easy distinction, and do not limit the protection scope of the present application. The specific working process of the unit and module in the above system can refer to the corresponding process in the foregoing method embodiment, which will not be described here.

[0147] As shown in Figure 6 The embodiment of the present application also provides a liquid cooling system, which comprises a heat exchanger 61, a primary side circuit 62 and a secondary side circuit 63 coupled to the heat exchanger 61, and the control device as described in the second aspect above, the primary side circuit 62 is provided with an external cold source, the secondary side circuit 63 comprises a main circuit and a bypass circuit, the main circuit is provided with a water pump unit 631 composed of M water pumps, the bypass circuit is provided with a bypass valve 632, the input end of the water pump unit 631 is connected with the output port of the heat exchanger, the output end of the water pump unit 631 is connected with the bypass circuit through the bypass valve 632, and is used to be connected with a load 633 to drive the cooling liquid back to the input port of the heat exchanger 61.

[0148] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described or recorded in detail in a certain embodiment can be referred to the related description of other embodiments.

[0149] Those skilled in the art can understand that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be realized by electronic hardware or a combination of computer software and electronic hardware. Whether the functions are realized in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0150] In the embodiments provided by the present application, it should be understood that the disclosed apparatus / control device and method can be implemented in other ways. For example, the apparatus / control device embodiments described above are merely schematic. For example, the division of the modules or units is merely a logical function division, and there can be another division manner in actual implementation. For example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed coupling or direct coupling or communication connection between each other can be indirect coupling or communication connection through some interface, device or unit, and can be electrical, mechanical or in other forms.

[0151] The units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, i.e. they can be located in one place or distributed on a plurality of network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiments.

[0152] In addition, each functional unit in each embodiment of the present application can be integrated into a processing unit, or each unit can exist physically independently, or two or more units can be integrated into one unit. The integrated unit can be realized in the form of hardware or in the form of a software functional unit.

[0153] The integrated module / unit, if implemented in the form of a software function unit and sold or used as an independent product, can be stored in a computer readable storage medium. Based on such understanding, all or part of the processes in the above-mentioned embodiment methods can also be completed by a computer program instructing related hardware, and the computer program can be stored in a computer readable storage medium. The computer program can implement the steps of the above-mentioned liquid cooling system water pump energy efficiency optimization control method embodiments when executed by a processor. The computer program includes computer program code, which can be in the form of source code, object code, executable files or some intermediate forms, etc. The computer readable medium can include any entity or device capable of carrying the computer program code, recording medium, U disk, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal and software distribution medium, etc. It should be noted that the contents included in the computer readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction, for example, in some jurisdictions, according to legislation and patent practice, the computer readable medium does not include electrical carrier signals and telecommunication signals.

[0154] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A water pump energy efficiency optimization control method of a liquid cooling system, characterized in that, The liquid cooling system comprises a water pump unit composed of M water pumps, and output ends of the water pump unit are connected with a load and a bypass respectively; wherein M≥1 and M is an integer; The method comprises: obtaining a load demand flow of the load; calculating a first energy efficiency parameter of the water pump unit when the water pump unit outputs the load demand flow under a current pump group, and a second energy efficiency parameter of the water pump unit when the water pump unit outputs an energy efficiency optimal flow under the current pump group; wherein the pump group is a combination of water pumps running in the water pump unit; determining a target running pump group and a target output flow of the water pump unit; wherein when the target running pump group is still the current pump group, a flow corresponding to a relatively optimal energy efficiency parameter is taken as the target output flow of the water pump unit, the relatively optimal energy efficiency parameter being a relatively optimal one of the first energy efficiency parameter and the second energy efficiency parameter; controlling the water pump unit to run in the target running pump group, and controlling the water pump unit based on the target output flow, and when the target output flow is greater than the load demand flow, controlling the water pump unit to deliver the load demand flow to the load and deliver a residual flow to the bypass; wherein the residual flow is a difference between the target output flow and the load demand flow; the M water pumps of the water pump unit are the same and are connected in parallel with each other, wherein M≥2; before the calculating a first energy efficiency parameter of the water pump unit when the water pump unit outputs the load demand flow under a current pump group, and a second energy efficiency parameter of the water pump unit when the water pump unit outputs an energy efficiency optimal flow under the current pump group, the method further comprises: obtaining a number N of water pumps running under the current pump group of the water pump unit, M≥N≥1 and N is an integer, and obtaining an energy efficiency optimal flow under the current pump group of the water pump unit; before the determining a target running pump group and a target output flow of the water pump unit, the method further comprises: determining an adjacent pump group to be compared based on the current pump group; wherein a number of water pumps running in the adjacent pump group is adjacent to a number of water pumps running in the current pump group; calculating a third energy efficiency parameter of the water pump unit when the water pump unit outputs the load demand flow under the adjacent pump group; correspondingly, the determining a target running pump group and a target output flow of the water pump unit comprises: taking a pump group and a flow corresponding to a relatively optimal energy efficiency parameter as the target running pump group and the target output flow respectively; wherein the relatively optimal energy efficiency parameter is a relatively optimal one of the first energy efficiency parameter, the second energy efficiency parameter and the third energy efficiency parameter.

2. The method of claim 1, wherein, the obtaining a load demand flow of the load further comprises: obtaining a change direction of the load demand flow; wherein the change direction comprises increasing and decreasing; correspondingly, the determining an adjacent pump group to be compared based on the current pump group comprises: if the change direction of the load demand flow is increasing, taking a pump group with a number of water pumps running of N+1 as the adjacent pump group to be compared; if the change direction of the load demand flow is decreasing, taking a pump group with a number of water pumps running of N-1 as the adjacent pump group to be compared.

3. The method of claim 1, wherein, the determining an adjacent pump group to be compared based on the current pump group comprises: if the load demand flow is greater than the energy efficiency optimal flow of the current pump group, the pump group with N+1 pumps running is taken as the adjacent pump group to be compared; if the load demand flow is less than the energy efficiency optimal flow of the current pump group, the pump group with N-1 pumps running is taken as the adjacent pump group to be compared.

4. The method of claim 1, wherein, Before the determining the target running pump group and the target output flow of the water pump unit, the method further comprises: calculating a fourth energy efficiency parameter of the water pump unit when the water pump unit outputs the energy efficiency optimal flow under the adjacent pump group; Correspondingly, the determining the target running pump group and the target output flow of the water pump unit comprises: taking the pump group corresponding to the better energy efficiency parameter and the flow as the target running pump group and the target output flow respectively, wherein the better energy efficiency parameter is the better one among the first energy efficiency parameter, the second energy efficiency parameter, the third energy efficiency parameter and the fourth energy efficiency parameter.

5. The pump energy optimization control method of a liquid cooling system according to any one of claims 1 to 4, characterized in that, The energy efficiency parameter comprises output power; The calculating the first energy efficiency parameter of the water pump unit when the water pump unit outputs the load demand flow under the current pump group and the second energy efficiency parameter of the water pump unit when the water pump unit outputs the energy efficiency optimal flow under the current pump group comprises: calculating the first output power of the water pump unit when the water pump unit outputs the load demand flow under N-pump condition based on the flow-power calculation formula of the N pumps of the water pump unit and taking the first output power as the first energy efficiency parameter, and calculating the second output power of the water pump unit when the water pump unit outputs the energy efficiency optimal flow under N-pump condition based on the flow-power calculation formula of the N pumps of the water pump unit and taking the second output power as the second energy efficiency parameter.

6. The pump energy optimization control method of a liquid cooling system according to any one of claims 1 to 4, characterized in that, The energy efficiency parameter comprises system efficiency; The calculating the first energy efficiency parameter of the water pump unit when the water pump unit outputs the load demand flow under the current pump group and the second energy efficiency parameter of the water pump unit when the water pump unit outputs the energy efficiency optimal flow under the current pump group comprises: in the water pump running efficiency library, based on the water pump running frequency corresponding to the water pump unit outputting the load demand flow under N-pump condition, searching for the running efficiency of the water pump unit when the water pump unit outputs the load demand flow under N-pump condition and taking the running efficiency as the first energy efficiency parameter, and based on the water pump running frequency corresponding to the water pump unit outputting the energy efficiency optimal flow under N-pump condition, searching for the running efficiency of the water pump unit when the water pump unit outputs the energy efficiency optimal flow under N-pump condition and taking the running efficiency as the second energy efficiency parameter; wherein the water pump running efficiency library contains the running efficiency of the water pump unit under different water pump running number conditions and different water pump running frequencies.

7. A control device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, The processor, when executing the computer program, implements the steps of the method of any one of claims 1 to 6.

8. A liquid cooling system, characterized by, A control device comprises a secondary side circuit and a control device as claimed in claim 7, the secondary side circuit comprises a main circuit, a bypass circuit and a water pump unit composed of M water pumps, the output end of the water pump unit is connected with the bypass circuit through a bypass valve and is used for being connected with a load.

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