Liquid cooling system and control method therefor

Abstract

A liquid cooling system for cooling a server system and a control method therefor. The liquid cooling system comprises: a first flowmeter for metering an inlet flow rate of a coolant flowing from a server system into the liquid cooling system, a second flowmeter for metering an outlet flow rate of the coolant flowing out of the liquid cooling system, a radiator comprising a plurality of fans, a water storage tank comprising at least one pump, and a controller for detecting a flow rate difference between the inlet flow rate and the outlet flow rate and recording an instantaneous value of the inlet flow rate or the outlet flow rate as a comparison value. The radiator receives a high-temperature coolant from the server system and then operates the fans to cool the coolant. The water storage tank receives the cooled coolant and inputs the coolant to the server system via the pump. Before the flow rate difference reaches a set pressure difference, if the inlet flow rate or the outlet flow rate rises to a first constant multiple of the comparison value, the rotation speed of the fans is increased.

Description

Liquid cooling system and its control method Technical Field

[0001] This invention relates to a liquid cooling system and its control method, and more particularly to a liquid cooling system and its control method for controlling fan speed to promote cooling. Background Technology

[0002] In existing liquid cooling systems, the supply water temperature is controlled by a controller (e.g., a PID controller). In some liquid cooling systems equipped with fans, the fan speed needs to change in the supply water temperature before the controller can adjust accordingly to maintain the desired temperature.

[0003] However, as described above, the traditional control method requires a temperature closed-loop control system to control the fan speed. The disadvantage of the temperature closed-loop control system is that the heat dissipation efficiency is low due to the large fluctuation range of water temperature and the long response time.

[0004] Furthermore, when servers are the objects of cooling, changes in the number of servers or replacement of servers will cause significant changes in the operating heat of the servers, but the existing liquid cooling system cannot adjust in time, resulting in low heat dissipation efficiency. Summary of the Invention

[0005] To address the drawbacks of large water temperature fluctuations and long response times, this invention proposes a method for regulating fan speed primarily through flow control.

[0006] According to some embodiments disclosed herein, a liquid cooling system for cooling a server system is provided, comprising: a first flow meter for detecting the inflow rate of coolant from the server system into the liquid cooling system; a second flow meter for detecting the outflow rate of coolant from the liquid cooling system; a radiator including a plurality of fans; a water tank including at least one pump; and a controller for detecting a flow difference between the inflow rate and the outflow rate and recording an instantaneous value of the inflow rate or the outflow rate as a comparison value. The radiator receives high-temperature coolant from the server system, and each of the fans operates to cool the coolant. The water tank receives the cooled coolant and, via the operating pump, inputs the cooled coolant from the liquid cooling system to the server system. Before the flow difference reaches a set pressure difference, if the controller determines that the inflow rate or the outflow rate has risen to a first constant multiple of the comparison value, it increases the rotational speed of each fan.

[0007] In some embodiments, the controller is also configured to control the operating speed of the pump to achieve a set pressure difference in the flow rate. When the flow rate difference reaches the set pressure difference, the controller begins to record the real-time value of the inlet or outlet flow rate.

[0008] In some embodiments, the liquid cooling system further includes: a first temperature sensor for detecting an inlet water temperature of the coolant flowing into the liquid cooling system, and a second temperature sensor for detecting an outlet water temperature of the coolant flowing out of the liquid cooling system. The controller is also configured to: detect a temperature difference between the inlet water temperature and the outlet water temperature; determine that a heat load on the server system has increased when the temperature difference is greater than a set temperature difference; and stop recording the real-time values ​​of the inlet water flow rate or the outlet water flow rate and increase the pump operating speed when the heat load is determined to be increasing and the inlet water flow rate decreases.

[0009] In some embodiments, when recording the real-time values ​​of influent or effluent flow rates stops, the controller uses the last real-time value recorded in a memory as the comparison value.

[0010] In some embodiments, the controller is further configured to: increase the speed of each fan to a set speed. The set speed is a second constant multiple of the original speed. The first constant and the second constant are greater than 1.

[0011] In some embodiments, the liquid cooling system further includes: a first temperature sensor for detecting an inlet temperature of the coolant flowing into the liquid cooling system from the server system, and a second temperature sensor for detecting an outlet temperature of the coolant flowing out of the liquid cooling system. When each fan operates at a set speed, the controller further combines a set outlet temperature, an inlet temperature, and an incremental value to calculate a first speed adjustment variable.

[0012] In some embodiments, the controller is further configured to: superimpose the outlet water temperature and the set outlet water temperature to obtain a first control value; adjust the first control value through a PID calculation unit to obtain a second control value; superimpose the second control value and the instantaneous value of the fan speed to obtain a second speed adjustment variable; and superimpose the first speed adjustment variable and the second speed adjustment variable to slightly adjust the speed of each fan.

[0013] According to some other embodiments disclosed herein, a control method for a liquid cooling system for cooling a server system is provided, comprising: detecting an inlet flow rate of coolant flowing from the server system into the liquid cooling system; detecting an outlet flow rate of coolant flowing out of the liquid cooling system; operating each of the fans via a radiator including multiple fans to cool the high-temperature coolant from the server system; operating at least one pump to input the cooled coolant from the liquid cooling system into the server system; detecting a flow difference between the inlet flow rate and the outlet flow rate; recording an instantaneous value of the inlet flow rate or the outlet flow rate as a comparison value; and increasing the rotational speed of each of the fans if it is determined that the inlet flow rate or the outlet flow rate has risen to a first constant multiple of the comparison value before the flow difference reaches a set pressure difference.

[0014] In some embodiments, the control method further includes: controlling the operating speed of the pump to make the flow difference reach a set pressure difference. When the flow difference reaches the set pressure difference, the real-time value of the inlet flow rate or outlet flow rate is recorded.

[0015] In some embodiments, the control method further includes: detecting an inlet water temperature of the coolant flowing into the liquid cooling system; detecting an outlet water temperature of the coolant flowing out of the liquid cooling system; detecting a temperature difference between the inlet water temperature and the outlet water temperature; determining that a heat load of the server system increases when the temperature difference is greater than a set temperature difference; and stopping recording the real-time value of the inlet water flow rate or the outlet water flow rate and increasing the operating speed of the pump when it is determined that the heat load has increased and the inlet water flow rate or the outlet water flow rate has decreased.

[0016] In some embodiments, the control method further includes: increasing the speed of each fan to a set speed. The set speed is a second constant multiple of the original speed. The first constant and the second constant are greater than 1.

[0017] In some embodiments, the control method further includes: detecting an inlet temperature of the coolant flowing into the liquid cooling system from the server system; and detecting an outlet temperature of the coolant flowing out of the liquid cooling system. When each fan operates at a set speed, a set outlet temperature, an inlet temperature, and an incremental value are combined to calculate a first speed adjustment variable.

[0018] In some embodiments, the control method further includes: superimposing the outlet water temperature and the set outlet water temperature to obtain a first control value; adjusting the first control value through a PID calculation unit to obtain a second control value; superimposing the second control value and the instantaneous value of the fan speed to obtain a second speed adjustment variable; and superimposing the first speed adjustment variable and the second speed adjustment variable to slightly adjust the speed of each fan. Attached Figure Description

[0019] When reading the accompanying drawings, the following detailed description will provide the best understanding of all aspects of this disclosure. It should be noted that, according to standard operating procedures in the industry, the various features are not necessarily drawn to scale. In fact, the dimensions of various features may be arbitrarily enlarged or reduced for clarity of illustration.

[0020] Figure 1 is an exemplary schematic diagram of a liquid cooling system and a server system according to some embodiments of the present disclosure;

[0021] Figure 2A is a flowchart of a control method for a liquid cooling system according to some embodiments of the present disclosure;

[0022] Figure 2B is a flowchart of a fan control method based on flow rate according to some embodiments of the present disclosure;

[0023] Figure 3 is a block diagram of the controller of the liquid cooling system according to some embodiments of the present disclosure;

[0024] Figure 4 is a flowchart of the control method corresponding to the block diagram in Figure 3.

[0025] Reference numerals: 100: Liquid cooling system; 110: First flow meter; 120: Second flow meter; 130: Radiator; 135: Fan; 140: Water tank; 145: Pump; 150: First temperature sensor; 160: Second temperature sensor; 170: Controller; 200: Server system; 201: Server; 301: Set outlet water temperature; 302: Inlet water temperature; 303: Incremental value; 304: First speed regulation variable; 305: Outlet water temperature; 306: First control value; 307: PID calculation unit; 308: Second control value; 309: Real-time value; 310: Second speed regulation variable; C: Coolant; S201, S202, S203, S204, S205, S206: Steps; S207, S208, S209, S210, S211, S212: Steps; S401, S402, S403, S404, S405: Steps Detailed Implementation

[0026] The following disclosure provides many different embodiments or examples, and describes specific examples of the various components and their arrangements to implement the different features of this disclosure. For example, if this specification describes a first feature formed "above" or "on top of" a second feature, it means that it may include embodiments in which the first and second features are in direct contact, or embodiments in which additional features are formed between the first and second features, so that the first and second features are not in direct contact.

[0027] Relative spatial terms, such as "below" or "above," may be used in the embodiments to facilitate the description of the relationship between elements or features in the drawings and other elements or features. In addition to the orientations shown in the drawings, these spatial terms are intended to encompass different orientations of the device in use or operation. The device may be turned to different orientations (rotated 90 degrees or other orientations), and the spatial terms used herein may be interpreted in the same manner.

[0028] Please refer to Figure 1 first. Figure 1 is an exemplary schematic diagram of a liquid cooling system 100 and a server system 200 according to some embodiments of the present disclosure. In the embodiments of the present disclosure, the liquid cooling system 100 is used to cool the server system 200. Specifically, the heat generated by the server system 200 is transported to the liquid cooling system 100 by the coolant C circulating in the liquid cooling system 100 and the server system 200, and the coolant C is cooled by the heat dissipation device in the liquid cooling system 100. The cooled coolant C is then sent back to the server system 200 to achieve the effect of cooling the server system 200. In Figure 1, solid lines represent cooled coolant C, and dashed lines represent coolant C after absorbing heat.

[0029] As shown in Figure 1, the server system 200 includes multiple servers 201. Coolant C flows through each server 201 to collect the heat generated by the operation of the servers 201 and transfer this heat to the liquid cooling system 100. The arrangement and location of the servers 201 are only illustrative and are not particularly limited thereto. The number of servers 201 is also not particularly limited and can be determined according to the user's actual needs. The way the coolant C flows through the servers 201 is also not particularly limited and any suitable known configuration can be used.

[0030] As shown in Figure 1, the liquid cooling system 100 includes: a first flow meter 110, a second flow meter 120, a radiator 130, a water storage tank 140, and a controller 170.

[0031] The first flow meter 110 is used to detect the inflow rate of coolant C from the server system 200 into the liquid cooling system 100. The second flow meter 120 is used to detect the outflow rate of coolant C from the liquid cooling system 100. As shown in FIG1, as an example, the first flow meter 110 is located at the high-temperature liquid inlet of the liquid cooling system 100 and connected to the liquid outlet of the server system 200; the second flow meter 120 is located at the low-temperature liquid outlet of the liquid cooling system 100 and connected to the liquid inlet of the server system 200. In some embodiments, the inflow and outflow rates detected by the first flow meter 110 and the second flow meter 120 are transmitted to the controller 170.

[0032] The heat sink 130 includes multiple fans 135. Although three fans 135 are shown in Figure 1, the number of fans 135 is not specifically limited thereto and can be set according to actual needs. As shown in Figure 1, the heat sink 130 receives the high-temperature coolant C from the server system 200 and operates each of the fans 135 to cool the coolant C. In detail, as shown in Figure 1, heat in the coolant C is dissipated to the outside (left side of the figure) by airflow, thereby achieving the effect of heat dissipation.

[0033] The water tank 140 includes at least one pump 145. Although one pump 145 is shown in Figure 1, the number of pumps 145 is not particularly limited thereto and can be set according to actual needs. The water tank 140 receives cooled coolant C and, via operating the pump 145, supplies the cooled coolant C from the liquid outlet of the liquid cooling system 100 to the server system 200. In some embodiments, the controller 170 can control the pump 145 to ensure that a sufficient flow of coolant C is provided to the server system 200 to achieve a cooling effect.

[0034] The controller 170 may include a memory (not shown) for storing data or parameters related to controlling the liquid cooling system 100. In some embodiments, the controller 170 may be used to detect the flow difference between the inlet and outlet water flow rates and record the real-time values ​​of the inlet and / or outlet water flow rates as comparison values.

[0035] In some embodiments, the liquid cooling system 100 further includes a first temperature sensor 150 and a second temperature sensor 160. As an example, as shown in FIG1, the first temperature sensor 150 may be disposed at the liquid inlet of the liquid cooling system 100, near the first flow meter 110; the second temperature sensor 160 may be disposed at the liquid outlet of the liquid cooling system 100, near the second flow meter 120. The first temperature sensor 150 is used to detect the inlet temperature of the coolant C flowing into the liquid cooling system 100; the second temperature sensor 160 is used to detect the outlet temperature of the coolant C flowing out of the liquid cooling system 100. In some embodiments, the inlet and outlet temperatures detected by the first temperature sensor 150 and the second temperature sensor 160 are transmitted to the controller 170. Furthermore, in this embodiment, the controller 170 may be used to detect the temperature difference between the inlet and outlet temperatures.

[0036] In Figure 1, although the controller 170 is schematically shown as a component externally connected to the liquid cooling system 100, it is not particularly limited thereto. The controller 170 may be placed in a suitable location depending on actual needs.

[0037] Next, the control method of the liquid cooling system 100 will be described with reference to FIG2A. FIG2A is a flowchart of the control method of the liquid cooling system 100 according to some embodiments of the present disclosure.

[0038] First, coolant C flows from the server system 200 into the liquid cooling system 100 through the liquid inlet (step S201). At this time, the inlet flow rate and inlet temperature of coolant C can be detected by the first flow meter 110 and the first temperature sensor 150 installed here (step S202).

[0039] Next, the heat sink 130 operates each of the fans 135 to cool the high-temperature coolant C from the server system 200 (step S203).

[0040] Then, at least one pump 145 in the water storage tank 140 is operated to allow the cooled coolant C to flow out of the liquid cooling system 100 through the liquid outlet and into the server system 200 (step S204). At this time, the outlet flow rate and outlet temperature of the coolant C can be detected by the second flow meter 120 and the second temperature sensor 160 installed here (step S205).

[0041] The controller 170 can receive the inlet water flow rate, the outlet water flow rate, the inlet water temperature, and the outlet water temperature, and detect the flow rate difference between the inlet water flow rate and the outlet water flow rate, as well as the temperature difference between the inlet water temperature and the outlet water temperature (step S206).

[0042] Next, the control method of the controller 170 controlling the fan 135 according to the flow rate will be described with reference to FIG2B. FIG2B is a flowchart of the control method of controlling the fan 135 according to the flow rate according to some embodiments of the present disclosure.

[0043] In step S207, the server system 200 is in its normal operating state. At this time, the controller 170 controls the operating speed of the pump 145 to maintain the inlet and outlet water flow rates at a set pressure difference, thereby maintaining the circulation of coolant C between the liquid cooling system 100 and the server system 200. Under this set pressure difference, the liquid cooling system 100 can provide a sufficient flow rate of coolant C to the server system 200 to cool it, according to set conditions. Furthermore, when the flow difference between the inlet and outlet water flow rates controlled by the pump 145 (detected in step S206 above) reaches the set pressure difference, the controller 170 begins recording the real-time values ​​of the inlet and / or outlet water flow rates as comparison values.

[0044] In step S208, the thermal load of the server system 200 changes. For example, changes in the number of servers 201 in the server system 200, the replacement of servers 201, or temporary failures of other water supply systems connected to the server system 200 besides the liquid cooling system 100 can all cause changes in the thermal load of the server system 200. When the thermal load increases, the heat dissipation demand of the server system 200 increases, resulting in an increase in the flow rate demand of the coolant C. In addition, a decrease in the inlet or outlet water flow rate may also increase the heat dissipation demand of the server system 200 and the flow rate demand of the coolant C. At this time, when the increased flow rate demand reduces the inlet and outlet water pressure difference, the controller 170 stops recording the real-time values ​​of the inlet and / or outlet water flow rates. In some embodiments, when the real-time values ​​of the inlet and / or outlet water flow rates are stopped, the controller 170 uses the last real-time value recorded in the memory as the aforementioned comparison value. At this time, the controller 170 can also calculate the real-time value of the fan 135 speed based on this comparison value. The instantaneous value of the fan speed 135 can be used to calculate the set speed of fan 135 as described below.

[0045] In step S209, through a known automatic control system, pump 145 can increase its operating speed in response to increased flow demand, thereby increasing the outflow rate of the liquid cooling system 100.

[0046] In step S210, the controller 170 can determine whether the inlet water flow rate and / or outlet water flow rate rise to a first constant multiple of the logarithmic value before the flow difference reaches the aforementioned set pressure difference. In some embodiments, the first constant is greater than 1. The setting of the first constant can be used to identify whether the flow rate change is a normal phenomenon. For example, the coolant C pipeline may become slightly blocked over time, and the resulting flow rate change will not rise to a first constant multiple of the logarithmic value, so it can be excluded from the situation where the heat load increases and needs to be resolved as soon as possible. On the other hand, in cases such as a change in the number of servers 201 in the server system 200, replacement of servers 201, or temporary failure of other water supply systems connected to the server system 200 other than the liquid cooling system 100, the resulting flow rate change rises to a first constant multiple of the logarithmic value, so the controller 170 can determine that heat dissipation needs to be carried out as soon as possible.

[0047] If the controller 170 determines that the inlet water flow rate and / or outlet water flow rate has increased to a first constant multiple of the comparison value, it proceeds to step S211. In step S211, the speed of each of the fans 135 is increased to a set speed. The set speed is a second constant multiple of the current speed (the speed before the increase, i.e., the instantaneous value of the speed of the aforementioned fans 135). In some embodiments, the second constant is greater than 1. Simultaneously, the flow rate recorded in the memory is updated to the instantaneous flow rate.

[0048] Next, in step S212, the fan speed is slightly adjusted through PID calculation and feedforward control to achieve a more efficient heat dissipation effect.

[0049] Furthermore, in addition to the method described above for controlling fan speed based on inlet and / or outlet water flow rates, the embodiments disclosed herein can further adjust the fan speed using the temperature difference between the inlet and outlet water temperatures (detected in step S206 above). For example, when the detected temperature difference is greater than a set temperature difference, the controller 170 can determine that the thermal load of the server system 200 has increased. Similar to steps S208 and S209 above, when the thermal load is determined to have increased, the recording of the real-time values ​​of the inlet or outlet water flow rates is stopped and the operating speed of the pump 145 is increased.

[0050] Next, the PID control method of step S212 described above will be explained in more detail with reference to Figures 3 and 4. Figure 3 is a block diagram of the controller 170 of the liquid cooling system 100 according to some embodiments of this disclosure. Figure 4 is a flowchart of the control method corresponding to the block diagram of Figure 3.

[0051] In Figure 3, the outlet water temperature 301 is set to the preset coolant C supply temperature. First, please refer to the loop at the top of Figure 3. In this loop, which serves as feedforward control, when each of the fans 135 operates at the aforementioned set speed, the controller 170 can combine the set outlet water temperature 301, the inlet water temperature 302, and the increment value 303 to calculate a first speed adjustment variable 304 (step S401). Specifically, the difference between the set outlet water temperature 301 and the inlet water temperature 302 can be considered as the thermal load of the server system 200. Based on this thermal load, the corresponding increment value 303 is determined as compensation for the fan speed. For example, when the temperature difference is greater, i.e., the thermal load of the server system 200 is greater, the fan speed can be increased earlier, shortening the response time of the controller 170.

[0052] Next, please refer to the loop shown at the bottom of Figure 3. In this loop, firstly, the outlet water temperature 305 and the set outlet water temperature 301 are superimposed to obtain a first control value 306 (step S402). The difference between the outlet water temperature 305 and the set outlet water temperature 301 can be used as the basis for determining whether the fan speed should increase or decrease, and this is used as the first control value 306. The first control value 306 is adjusted by the PID calculation unit 307 to obtain a second control value 308 (step S403). Next, the second control value 308 is superimposed with the instantaneous value of the fan speed 309 (the fan speed at the previous moment) to obtain a second speed adjustment variable 310 (step S404). Finally, the first speed adjustment variable 304 and the second speed adjustment variable 310 are superimposed and input to the liquid cooling system 100 to slightly adjust the speed of each of the fans 135 (step S405).

[0053] In summary, according to some embodiments disclosed herein, the liquid cooling system 100 can be controlled from two aspects: flow rate and temperature. When the outlet water flow rate increases, it can be determined that the heat dissipation demand of the server system 200 has increased, and the fan speed is increased accordingly. Simultaneously, by detecting the difference between the set outlet water temperature and the inlet water temperature, the fan speed can be increased in advance to respond to the thermal load of the server system 200. This effectively reduces the response time of the controller 170, decreases the fluctuation range of water temperature, and improves the effect of fan-assisted liquid cooling.

[0054] While the embodiments and advantages of the present invention have been disclosed above, it should be understood that any person skilled in the art can make modifications, substitutions, and refinements without departing from the spirit and scope of the invention. Furthermore, the scope of protection of the present invention is not limited to the processes, machines, manufacturing, material composition, apparatus, methods, and steps described in the specific embodiments of the specification. Any process, machine, manufacturing, material composition, apparatus, method, and step that is currently or will be developed in the future can be understood from the disclosure of the present invention, and can be used according to the present invention as long as it can perform substantially the same function or obtain substantially the same results in the embodiments described herein. Therefore, the scope of protection of the present invention includes the aforementioned processes, machines, manufacturing, material composition, apparatus, methods, and steps. In addition, each claim constitutes an individual embodiment, and the scope of protection of the present invention also includes combinations of the various claim scopes and embodiments.

Claims

1. A liquid cooling system for cooling a server system, comprising: The first flow meter is used to detect the inflow rate of coolant from the server system into the liquid cooling system; The second flow meter is used to detect the flow rate of the coolant flowing out of the liquid cooling system; A heat sink includes multiple fans, wherein the heat sink receives the coolant at high temperatures from the server system, and operates each of the multiple fans to cool the coolant; A water tank, including at least one pump, wherein the water tank receives the cooled coolant and supplies the cooled coolant from the liquid cooling system to the server system via operating the pump; as well as The controller is used to detect the flow difference between the inlet flow rate and the outlet flow rate, and record the real-time value of the inlet flow rate or the outlet flow rate as a comparison value. Specifically, if the controller determines that the inflow rate or the outflow rate has risen to a first constant multiple of the comparison value before the flow rate difference reaches the set pressure difference, then the speed of each of the plurality of fans is increased.

2. The liquid cooling system according to claim 1, wherein the controller is further configured to: By controlling the operating speed of the pump, the flow difference is made to reach the set pressure difference; in, When the flow rate difference reaches the set pressure difference, the controller starts recording the real-time value of the inlet flow rate or the outlet flow rate.

3. The liquid cooling system according to claim 2, further comprising: A first temperature sensor is used to detect the inlet temperature of the coolant flowing into the liquid cooling system; as well as A second temperature sensor is used to detect the outlet temperature of the coolant flowing out of the liquid cooling system; The controller is further configured to: Detect the temperature difference between the inlet water temperature and the outlet water temperature; When the temperature difference exceeds a set temperature difference, it is determined that the thermal load of the server system has increased; and When it is determined that the heat load increases and the inlet flow rate or the outlet flow rate decreases, the recording of the instantaneous value of the inlet flow rate or the outlet flow rate is stopped and the operating speed of the pump is increased.

4. The liquid cooling system according to claim 3, wherein, When the real-time value of the inflow or outflow rate is stopped being recorded, the controller uses the last real-time value recorded in the memory as the comparison value.

5. The liquid cooling system according to claim 1, wherein the controller is further configured to: Increase the speed of each of the plurality of fans to a set speed; in, The set rotation speed is a second constant multiple of the rotation speed before the increase; Wherein, the first constant and the second constant are greater than 1.

6. The liquid cooling system according to claim 5, further comprising: A first temperature sensor is used to detect the inlet temperature of the coolant flowing from the server system into the liquid cooling system; as well as A second temperature sensor is used to detect the outlet temperature of the coolant flowing out of the liquid cooling system; When each of the plurality of fans operates at the set speed, the controller is also used to combine the set outlet water temperature, the inlet water temperature and the incremental value to calculate the first speed adjustment variable.

7. The liquid cooling system according to claim 6, wherein the controller is further configured to: The outlet water temperature is superimposed with the set outlet water temperature to obtain a first control value; The first control value is adjusted by the PID calculation unit to obtain the second control value; The second control value is superimposed with the real-time values ​​of the rotational speeds of the plurality of fans to obtain the second speed adjustment variable; as well as The first speed adjustment variable and the second speed adjustment variable are superimposed to slightly adjust the speed of each of the plurality of fans.

8. A control method for a liquid cooling system for cooling a server system, comprising: The flow rate of coolant flowing from the server system into the liquid cooling system is detected. Detect the flow rate of the coolant exiting the liquid cooling system; Each of the multiple fans is operated by a heatsink comprising multiple fans to cool the coolant from the high temperature of the server system; Operate at least one pump to allow the cooled coolant to be input from the liquid cooling system to the server system; Detect the flow difference between the inflow rate and the outflow rate; Record the real-time values ​​of the inflow rate or the outflow rate as comparison values; as well as If, before the flow difference reaches the set pressure difference, it is determined that the inflow rate or the outflow rate rises to a first constant multiple of the comparison value, then the rotational speed of each of the plurality of fans is increased.

9. The control method according to claim 8, further comprising: Control the operating speed of the pump so that the flow difference reaches the set pressure difference; Specifically, when the flow difference reaches the set pressure difference, the instantaneous value of the inflow flow or the outflow flow is recorded.

10. The control method according to claim 9, further comprising: Detect the inlet water temperature of the coolant flowing into the liquid cooling system; Detect the outlet temperature of the coolant flowing out of the liquid cooling system; Detect the temperature difference between the inlet water temperature and the outlet water temperature; When the temperature difference is greater than the set temperature difference, it is determined that the thermal load of the server system has increased; as well as When it is determined that the heat load increases and the inlet flow rate or the outlet flow rate decreases, the recording of the instantaneous value of the inlet flow rate or the outlet flow rate is stopped and the operating speed of the pump is increased.

11. The control method according to claim 8, further comprising: Increase the speed of each of the plurality of fans to a set speed; Wherein, the set rotational speed is a second constant multiple of the rotational speed before the increase; Wherein, the first constant and the second constant are greater than 1.

12. The control method according to claim 11, further comprising: Detect the inlet water temperature of the coolant flowing from the server system into the liquid cooling system; as well as Detect the outlet temperature of the coolant flowing out of the liquid cooling system; When each of the plurality of fans operates at the set speed, the set outlet water temperature, the inlet water temperature, and the incremental value are combined to calculate the first speed adjustment variable.

13. The control method according to claim 12, further comprising: The outlet water temperature is superimposed with the set outlet water temperature to obtain a first control value; The first control value is adjusted by the PID calculation unit to obtain the second control value; The second control value is superimposed with the real-time values ​​of the rotational speeds of the plurality of fans to obtain the second speed adjustment variable; as well as The first speed adjustment variable and the second speed adjustment variable are superimposed to slightly adjust the speed of each of the plurality of fans.

Images