A temperature monitoring and adjusting method based on phase change microcapsule composite coolant

Abstract

The application discloses a temperature monitoring and adjusting method based on a phase change microcapsule composite coolant, relates to the technical field of adjusting and controlling, and comprises the following steps: calculating an equivalent thermal resistance in a running process in a process in which the composite coolant continuously circulates; calculating a comprehensive impedance index by using the equivalent thermal resistance in the running process and a pressure drop of the coolant in the running process; and performing segmented adjusting operations on a circulating flow rate of the coolant and a supply liquid temperature based on the comprehensive impedance index and a hotspot area temperature, so as to obtain a segmented adjusted pressure drop of the coolant, a segmented adjusted turbidity, a circulating flow rate control value of the coolant and a supply liquid temperature control value. By calculating the comprehensive impedance index, the heat exchange performance change and the flow resistance change of the coolant under the current running state can be quantified, the adjusting overshoot and the response lag phenomena commonly existing in a single temperature control strategy are avoided, and the problem that the heat exchange capacity change and the flow resistance change are difficult to determine in coordination is solved.

Description

Technical Field

[0001] This invention relates to the field of regulation and control technology, and in particular to a method for temperature monitoring and regulation based on phase change microcapsule composite coolant. Background Technology

[0002] Currently, with the continuous increase in computing power density in fields such as AI computing and supercomputing, liquid cooling technology has become one of the mainstream solutions for heat dissipation in high-density electronic devices due to its efficient heat exchange capabilities. Phase change microcapsule composite coolants disperse microcapsules containing phase change materials in a base coolant, allowing them to absorb a large amount of latent heat near the phase change point, thereby actively suppressing temperature rise and maintaining a temperature plateau. Existing technologies for monitoring composite coolants mostly rely on threshold judgments of single physical parameters, and adjustment strategies typically employ PID control based on fixed thresholds or simple flow rate / temperature linkage to achieve preliminary management of the thermal state.

[0003] The existing technology still has room for improvement. First, the current method only uses temperature deviation as the basis for adjustment and fails to uniformly characterize changes in heat transfer capacity and flow resistance, making it difficult to synergistically determine the properties of composite coolants. Second, phase change microcapsules may break, agglomerate, or accumulate impurities during long-term circulation. Current methods usually rely on manual maintenance or periodic replacement, making it difficult to achieve stable recovery of coolant performance. Summary of the Invention

[0004] In view of the aforementioned existing problems, the present invention is proposed.

[0005] Therefore, this invention provides a method for temperature monitoring and regulation based on phase change microcapsule composite coolant to solve the problems of difficulty in synergistic determination and stability recovery of composite coolant.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0007] This invention provides a method for temperature monitoring and regulation based on phase change microcapsule composite coolant, comprising,

[0008] The temperature of the hot spot area, the supply temperature, the return temperature, the load power, the cooling pressure drop and the turbidity are obtained, and the equivalent thermal resistance after the phase change microcapsules are dispersed is calculated. The equivalent thermal resistance after the phase change microcapsules are dispersed, the cooling pressure drop and the turbidity are used as the initial reference values.

[0009] Calculate the equivalent thermal resistance of the composite coolant during continuous circulation, and use the equivalent thermal resistance and coolant pressure drop during operation to calculate the comprehensive impedance index.

[0010] Based on the comprehensive impedance index and the temperature of the hot spot area, the coolant circulation flow rate and supply temperature are adjusted in stages to obtain the coolant pressure drop, turbidity, coolant circulation flow rate control value and supply temperature control value after the stage adjustment.

[0011] By acquiring the coolant pressure drop after segmented adjustment, the turbidity after segmented adjustment, the initial reference value, the coolant circulation flow rate control value, and the supply temperature control value, the composite coolant is bypassed for filtration and maintenance, and the current coolant operating status parameters are obtained.

[0012] As a preferred embodiment of the temperature monitoring and regulation method based on phase change microcapsule composite coolant described in this invention, the specific steps for obtaining the hot spot temperature, supply temperature, return temperature, load power, coolant pressure drop, and turbidity are as follows:

[0013] Phase change microcapsules are added to the coolant to form a composite coolant;

[0014] The composite coolant is continuously circulated at a preset low circulation flow rate for a preset duration, and the temperature of the hot spot area, the supply temperature, the return temperature, the load power, the coolant pressure drop, and the turbidity are collected.

[0015] As a preferred embodiment of the temperature monitoring and regulation method based on phase change microcapsule composite coolant described in this invention, the specific steps for calculating the equivalent thermal resistance after phase change microcapsule dispersion are as follows:

[0016] The temperature difference between the hot spot area and the liquid supply is calculated using the hot spot area temperature and the liquid supply temperature.

[0017] The temperature difference and load power are used to calculate the temperature difference value corresponding to a unit load power, and the equivalent thermal resistance of the phase change microcapsules after dispersion is obtained.

[0018] As a preferred embodiment of the temperature monitoring and regulation method based on phase change microcapsule composite coolant described in this invention, the calculation of the comprehensive impedance index using the equivalent thermal resistance and coolant pressure drop during operation is carried out in the following specific steps.

[0019] The equivalent thermal resistance and cooling pressure drop during operation are made dimensionless to obtain dimensionless equivalent thermal resistance and dimensionless cooling pressure drop.

[0020] The overall impedance index is calculated using dimensionless equivalent thermal resistance and dimensionless cooling pressure drop.

[0021] As a preferred embodiment of the temperature monitoring and regulation method based on phase change microcapsule composite coolant described in this invention, the segmented regulation operation comprises the following specific steps.

[0022] The first, second, and third preset ranges are set based on the historical comprehensive impedance index, and the phase transition temperature range is set based on the hot spot temperature and equivalent thermal resistance.

[0023] The coolant circulation rate and supply temperature are adjusted based on the comprehensive impedance index, the first preset range, the second preset range, the third preset range, the hot spot temperature range, and the phase change temperature range, and the coolant circulation rate control value and supply temperature control value are recorded.

[0024] As a preferred embodiment of the temperature monitoring and regulation method based on phase change microcapsule composite coolant described in this invention, the specific steps for adjusting the coolant circulation rate and supply temperature according to the comprehensive impedance index, a first preset interval, a second preset interval, a third preset interval, the temperature of the hot spot area, and the phase change temperature interval are as follows.

[0025] When the comprehensive impedance index is within the first preset range, the coolant circulation flow rate is limited to the first predetermined range, and the supply temperature is reduced to obtain the supply temperature control value and the coolant circulation flow rate control value of the first stage.

[0026] When the comprehensive impedance index is in the second preset range, the coolant circulation flow rate is limited to the second predetermined range, and the supply temperature is kept constant to obtain the coolant circulation flow rate control value in the second stage.

[0027] When the comprehensive impedance index is in the third preset range and the temperature of the hot spot area is in the phase change temperature range, the coolant circulation flow rate is increased while the supply temperature remains constant to obtain the coolant circulation flow rate control value in the third stage.

[0028] When the temperature of the hot spot area during operation exceeds the upper limit of the phase change temperature range, the coolant circulation flow rate is kept constant and the supply temperature is reduced to obtain the supply temperature control value for phase change.

[0029] The coolant circulation flow rate control values ​​for the first stage, the second stage, and the third stage are determined as the coolant circulation flow rate control values, and the supply temperature control values ​​for the first stage and the supply temperature control values ​​for the phase change are determined as the supply temperature control values.

[0030] After segmented adjustment, the cooling pressure drop and turbidity after segmented adjustment are collected.

[0031] In a preferred embodiment of the temperature monitoring and regulation method based on phase change microcapsule composite coolant described in this invention, the bypass filtration and maintenance operation of the composite coolant includes the following specific steps.

[0032] The coolant pressure drop and turbidity after segmented adjustment are compared with the initial reference values. When either the coolant pressure drop or the turbidity after segmented adjustment exceeds the preset ratio of the corresponding initial reference value, a bypass filtration operation is performed on the composite coolant.

[0033] After bypass filtration is completed, collect the cooling pressure drop and turbidity after bypass filtration.

[0034] The pressure drop and turbidity of the coolant after bypass filtration are compared with the initial reference values. If either the pressure drop or the turbidity exceeds the preset ratio of the corresponding initial reference value, maintenance is performed on the composite coolant.

[0035] As a preferred embodiment of the temperature monitoring and regulation method based on phase change microcapsule composite coolant described in this invention, the bypass filtration operation refers to diverting a portion of the composite coolant from the main circulation path to the bypass flow path under the condition that the coolant circulation flow rate control value and the supply temperature control value remain unchanged, and using the filter medium in the bypass flow path to filter the composite coolant.

[0036] As a preferred embodiment of the temperature monitoring and regulation method based on phase change microcapsule composite coolant described in this invention, the maintenance operation refers to draining part of the composite coolant and replenishing it with new composite coolant while keeping the coolant circulation flow rate control value and supply temperature control value unchanged, until the coolant pressure drop and turbidity after maintenance return to the preset ratio of the corresponding initial reference value.

[0037] As a preferred embodiment of the temperature monitoring and regulation method based on phase change microcapsule composite coolant described in this invention, the specific steps for obtaining the current coolant operating status parameters are as follows:

[0038] After the cooling pressure drop and turbidity are restored to the preset ratio corresponding to the initial reference value, the cooling pressure drop, turbidity, hot spot temperature, supply temperature and load power are reacquired and the current equivalent thermal resistance is calculated.

[0039] The current equivalent thermal resistance, the reacquired coolant pressure drop, and the reacquired turbidity are used as the current coolant operating status parameters.

[0040] The beneficial effects of this invention are as follows: By calculating the comprehensive impedance index, the changes in heat transfer performance and flow resistance of the coolant under the current operating state can be uniformly quantified, avoiding the overshoot and response hysteresis phenomena commonly found in single temperature control strategies, improving the continuity and predictability of temperature control, and solving the problem of difficulty in coordinating the determination of changes in heat transfer capacity and flow resistance; In addition, by continuously comparing the coolant pressure drop and turbidity, the abnormal state of filterable impurities and phase change microcapsules can be graded, and the coolant operating state can be restored without interfering with the existing temperature control strategy, solving the problem of difficulty in achieving stable recovery of coolant performance. Attached Figure Description

[0041] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 This is a flowchart of a temperature monitoring and regulation method based on phase change microcapsule composite coolant.

[0043] Figure 2 A schematic diagram established for the initial reference values.

[0044] Figure 3 This is a schematic diagram for calculating the composite impedance index.

[0045] Figure 4 This is a schematic diagram for bypass filtering and maintenance operations. Detailed Implementation

[0046] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0047] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0048] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0049] Reference Figures 1-4 This is one embodiment of the present invention, which provides a method for temperature monitoring and regulation based on phase change microcapsule composite coolant, including the following steps:

[0050] S1: Obtain the temperature of the hot spot area, the supply temperature, the return temperature, the load power, the cooling pressure drop and turbidity, and calculate the equivalent thermal resistance after the phase change microcapsules are dispersed. Use the equivalent thermal resistance, cooling pressure drop and turbidity after the phase change microcapsules are dispersed as the initial reference values.

[0051] S1.1: Add phase change microcapsules to the coolant and stir the phase change microcapsules and coolant to form a composite coolant.

[0052] After the composite coolant was continuously circulated in the circulation path at a flow rate of 0.3 m / s for 20 minutes, the temperature at the locations of the computing chip, power conversion device, and outlet manifold was measured using temperature sensors located at these locations and compared. The location with the highest temperature was designated as the hot spot area, and the temperature corresponding to the hot spot area was designated as the hot spot area temperature. At the same time, the supply temperature, return temperature, load power, coolant pressure drop, and turbidity were collected.

[0053] It should also be noted that when the temperatures of the computing chip location, the power conversion device location, and the liquid outlet manifold location are the same, the computing chip location will be identified as the hot spot area.

[0054] The circulation velocity of 0.3 m / s was chosen because it ensures stable and continuous flow of the composite coolant while preventing the phase change microcapsules from breaking or aggregating abnormally due to shearing. If the velocity is greater than 0.3 m / s, the phase change microcapsules in the composite coolant will experience increased shearing during circulation, which could easily cause abnormal increases in coolant pressure drop and turbidity, causing the initial reference value to deviate from the true stable operating condition. If the velocity is less than 0.3 m / s, the driving force of the composite coolant circulation will be insufficient, which could easily lead to local stagnation or uneven distribution, resulting in fluctuations in the temperature, coolant pressure drop, and turbidity of the collected hot spots, thus reducing the stability of the initial reference value.

[0055] The reason for choosing a circulation time of 20 minutes is that it allows the composite coolant to complete the stabilization process of flow field, temperature, pressure drop and turbidity under low circulation flow rate conditions. If the circulation time is greater than 20 minutes, it is easy to introduce additional heat accumulation or environmental fluctuations, causing the initial reference value to drift. If the circulation time is less than 20 minutes, the initial reference value is easily affected by transient conditions, which reduces repeatability.

[0056] Load power refers to the heat generated during the operation of heat-using equipment that is submerged in composite coolant and dissipated by the composite coolant.

[0057] S1.2: The equivalent thermal resistance of the phase change microcapsules after dispersion is calculated using the hot spot temperature, liquid supply temperature, and load power. The expression is:

[0058] ;

[0059] in, The equivalent thermal resistance after phase change microcapsule dispersion. Temperature of hotspot areas, For the liquid supply temperature, This represents the load power.

[0060] The equivalent thermal resistance after dispersion of phase change microcapsules is used as the equivalent thermal resistance reference value, the cooling pressure drop after dispersion of phase change microcapsules is used as the cooling pressure drop reference value, and the turbidity after dispersion of phase change microcapsules is used as the turbidity reference value. The equivalent thermal resistance reference value, cooling pressure drop reference value, and turbidity reference value are collectively referred to as the initial reference value.

[0061] After the phase change microcapsules are dispersed, they become a composite coolant. This coolant is then introduced into the circulation path and continuously circulated for 20 minutes at a circulation flow rate of 0.3 m / s.

[0062] It should also be noted that by simultaneously acquiring the hot spot temperature, supply temperature, return temperature, load power, coolant pressure drop, and turbidity under stable circulation conditions of the composite coolant, and calculating the equivalent thermal resistance after phase change microcapsule dispersion based on the hot spot temperature, supply temperature, and load power, the equivalent thermal resistance, coolant pressure drop, and turbidity are made into a unified initial reference value. This provides a stable and comparable benchmark for parameter changes under subsequent operating conditions, solving the problem of inaccurate adjustment judgments caused by inconsistent initial states between different operating stages.

[0063] S2: Calculate the equivalent thermal resistance during the continuous circulation of the composite coolant, and use the equivalent thermal resistance and coolant pressure drop during operation to calculate the comprehensive impedance index.

[0064] S2.1: During the continuous circulation of the composite coolant, obtain the temperature of the hot spot area, the supply temperature, the coolant pressure drop, and the load power during operation, and use the expression for calculating the equivalent thermal resistance after the phase change microcapsules are dispersed in step S1.2 to calculate the equivalent thermal resistance during operation.

[0065] The ratio of the equivalent thermal resistance during operation to the equivalent thermal resistance reference value in the initial reference value is taken as the dimensionless equivalent thermal resistance, and the ratio of the cooling pressure drop during operation to the cooling pressure drop reference value in the initial reference value is taken as the dimensionless cooling pressure drop.

[0066] S2.2: Collect historical dimensionless equivalent thermal resistance and historical dimensionless cooling pressure drop, and calculate the standard deviation of historical dimensionless equivalent thermal resistance as the standard deviation of equivalent thermal resistance, and calculate the standard deviation of historical dimensionless cooling pressure drop as the standard deviation of cooling pressure drop.

[0067] The sum of the reciprocal of the standard deviation of equivalent thermal resistance and the reciprocal of the standard deviation of cooling pressure drop is used as the weight benchmark value. The ratio of the reciprocal of the standard deviation of equivalent thermal resistance to the weight benchmark value is used as the equivalent thermal resistance weight, and the ratio of the reciprocal of the standard deviation of cooling pressure drop to the weight benchmark value is used as the cooling pressure drop weight.

[0068] It should also be noted that when the standard deviation of equivalent thermal resistance or the standard deviation of cooling pressure drop is 0, the corresponding standard deviation should be replaced with 0.01. This is because 0.01 can prevent zero standard deviation from being misjudged as the absolute dominant factor while maintaining the stability of the weight calculation value, and will not significantly distort the relative contribution of historical fluctuation characteristics. If it is greater than 0.01, it may cause the comprehensive impedance index to respond sluggishly to changes in the actual state. If it is less than 0.01, it may cause the corresponding weight to increase abnormally, amplify small noises and cause fluctuations in the comprehensive impedance index.

[0069] The historical dimensionless equivalent thermal resistance and historical dimensionless cooling pressure drop were both obtained from continuous operating data acquired within the last 30 minutes, with a sampling period of 5 seconds. Because the continuous operating data acquired within 30 minutes and the sampling period of 5 seconds can cover the typical thermal-flow response cycle of phase change microcapsules under cyclic conditions, it avoids the instability of statistics caused by an excessively short window or the introduction of the influence of outdated operating conditions by an excessively long window. If it is longer than 30 minutes, it may cause the standard deviation of equivalent thermal resistance and the standard deviation of cooling pressure drop to decrease in sensitivity to the current adjustment decision. If it is shorter than 30 minutes, it may cause the standard deviation of equivalent thermal resistance and the standard deviation of cooling pressure drop to increase due to transient fluctuations, reducing the stability of the comprehensive impedance index calculation.

[0070] The dimensionless cooling pressure drop and dimensionless equivalent thermal resistance are weighted and summed using the cooling pressure drop weight and the equivalent thermal resistance weight, respectively. The expression is as follows:

[0071] ;

[0072] in, The overall impedance index, As the equivalent thermal resistance weight, For dimensionless equivalent thermal resistance, To reduce the weight of the cooling hydraulic fluid, The pressure drop is a dimensionless cooling pressure.

[0073] For example, the equivalent thermal resistance weight is set to 0.6, and the cooling pressure drop weight is set to 0.4. This is because the equivalent thermal resistance directly characterizes the overall heat transfer capacity change of the phase change microcapsule composite coolant and has a more direct indicative significance for temperature regulation in hot spot areas. The cooling pressure drop mainly reflects the flow resistance and microcapsule structural risks, and its changes are usually relatively lagging. If the equivalent thermal resistance weight is greater than 0.6, it may trigger regulation or maintenance actions in advance. If it is less than 0.6, it may delay the timing of regulation for abnormal temperatures in hot spot areas, affecting the timeliness of temperature control. If the cooling pressure drop weight is greater than 0.4, it may inhibit the full utilization of the latent heat advantage of phase change. If it is less than 0.4, the sensitivity to the rheological risks of microcapsules is reduced, which is not conducive to long-term stable operation.

[0074] It should also be noted that by making the equivalent thermal resistance and cooling pressure drop during operation dimensionless and then performing a weighted summation to obtain the comprehensive impedance index, the changes in heat transfer performance and flow resistance of the composite coolant during operation can be uniformly and quantitatively characterized. This avoids the one-sidedness caused by adjusting based on a single temperature or pressure drop parameter and solves the problem of difficulty in coordinating the determination of changes in heat transfer capacity and flow resistance.

[0075] S3: Based on the comprehensive impedance index and the temperature of the hot spot area, the coolant circulation flow rate and supply temperature are adjusted in stages to obtain the coolant pressure drop, turbidity, coolant circulation flow rate control value and supply temperature control value after stage adjustment.

[0076] S3.1: Collect historical composite impedance indices to form a historical composite impedance index sequence. Arrange the historical composite impedance index sequence from smallest to largest and divide it into three parts evenly according to the number of historical composite impedance indices, forming the lower third sequence, the middle third sequence, and the upper third sequence.

[0077] The first preset interval is obtained by taking the largest historical composite impedance index in the upper third tertiary sequence as the upper limit of the first preset interval and the smallest historical composite impedance index as the lower limit of the first preset interval.

[0078] The second preset interval is obtained by taking the largest historical composite impedance index in the middle three-thirds sequence as the upper limit of the second preset interval and the smallest historical composite impedance index as the lower limit of the second preset interval.

[0079] The third preset interval is obtained by taking the largest historical composite impedance index in the lower third tertiary sequence as the upper limit of the third preset interval and the smallest historical composite impedance index as the lower limit of the third preset interval.

[0080] The lower third sequence is the part with the smallest historical composite impedance index obtained by dividing the historical composite impedance index sequence into three parts evenly according to the number of elements.

[0081] The middle tertiary sequence is the second smallest part of the historical composite impedance index obtained by dividing the historical composite impedance index sequence into three parts according to the quantity.

[0082] The upper third ternary sequence is the largest part of the historical composite impedance index obtained by dividing the historical composite impedance index sequence into three parts according to the number of elements.

[0083] Collect the hot spot temperatures and the corresponding equivalent thermal resistances during historical operation to form a historical correspondence sequence. Arrange the historical correspondence sequence from low to high according to the hot spot temperatures during historical operation. Calculate the absolute value of the difference between the hot spot temperatures and the corresponding equivalent thermal resistances during historical operation of adjacent historical operation processes, and use this as the change in historical equivalent thermal resistance.

[0084] For example, if the temperatures of the hot spots in adjacent historical operating processes are 27℃ and 28℃ respectively, and the corresponding equivalent thermal resistances in the historical operating processes are 0.18 and 0.20, then the change in historical equivalent thermal resistance is 0.02.

[0085] The equivalent thermal resistance change threshold is set using the percentile method based on the historical equivalent thermal resistance change. For example, the historical equivalent thermal resistance changes are arranged from smallest to largest, and the historical equivalent thermal resistance change at the 25th percentile is used as the equivalent thermal resistance change threshold. The hot spot temperature in the historical operation process whose historical equivalent thermal resistance change does not exceed the equivalent thermal resistance change threshold is used as the candidate phase change temperature. The hot spot temperature in the historical operation process with the largest candidate phase change temperature is used as the upper limit of the phase change temperature range, and the hot spot temperature in the historical operation process with the smallest candidate phase change temperature is used as the lower limit of the phase change temperature range, thus obtaining the phase change temperature range.

[0086] The 25% historical equivalent thermal resistance change was chosen as the equivalent thermal resistance change threshold because the 25% historical equivalent thermal resistance change represents the temperature range where the equivalent thermal resistance changes most gently and stably with the temperature of the hot spot region. If it is greater than 25%, temperature points with large changes may be included in the candidate phase change temperature, which will widen the phase change temperature range and mix in non-phase change conditions. If it is less than 25%, it may reduce the number of historical hot spot temperatures that can meet the conditions, making the phase change temperature range too narrow or even unable to form a continuous range.

[0087] S3.2: The comprehensive impedance index and the temperature of the hot spot area during operation are compared with the first preset range, the second preset range, the third preset range and the phase change temperature range respectively, and the coolant circulation flow rate and supply temperature are adjusted accordingly.

[0088] Specifically, when the comprehensive impedance index is in the first preset range, the coolant circulation velocity is limited to between 0.6 m / s and 0.8 m / s, and the supply temperature is reduced by 3°C. At the same time, the adjusted coolant circulation velocity is recorded as the coolant circulation velocity control value for the first stage, and the reduced supply temperature is recorded as the supply temperature control value for the first stage.

[0089] The reason for limiting the coolant circulation velocity to between 0.6 m / s and 0.8 m / s and reducing the supply temperature by 3°C is that it can maintain stable convective heat transfer without significantly increasing the risk of shearing, and can quickly reduce the temperature of hot spots through a limited adjustment of the supply temperature. If the upper limit of the circulation velocity is higher than 0.8 m / s or the supply temperature is reduced by more than 3°C, it may increase the shear load on the phase change microcapsules and cause an abnormal increase in coolant pressure drop. If the lower limit of the circulation velocity is lower than 0.6 m / s or the supply temperature is reduced by less than 3°C, the effect of suppressing the temperature of hot spots is insufficient, which may cause the comprehensive impedance index to remain in the first preset range for a long time.

[0090] When the comprehensive impedance index is in the second preset range, the coolant circulation velocity is limited to between 0.6 m / s and 0.8 m / s, and the supply temperature is kept constant. At the same time, the adjusted coolant circulation velocity is recorded as the coolant circulation velocity control value for the second stage.

[0091] The reason for limiting the coolant circulation velocity to between 0.6 m / s and 0.8 m / s is that it can maintain stable convective heat transfer without significantly increasing the risk of shearing. This is suitable as a restricted operating range when the overall impedance index is at a medium level. If it is greater than 0.8 m / s, it is easy to cause a drop in coolant pressure and an increase in turbidity, which weakens the improvement effect on the overall impedance index. If it is less than 0.6 m / s, it will lead to a decrease in convective heat transfer capacity, a slower temperature drop rate in hot spots, and a longer residence time of the overall impedance index in the second preset range.

[0092] When the comprehensive impedance index is in the third preset range and the temperature of the hot spot area during operation is in the phase change temperature range, the coolant circulation velocity is increased to 0.9 m / s, and the supply temperature is kept constant. At the same time, the adjusted coolant circulation velocity is recorded as the coolant circulation velocity control value for the third stage.

[0093] The reason for choosing to increase the coolant circulation velocity to 0.9 m / s is that it can enhance convective heat transfer and promote the release of latent heat from phase change microcapsules when the temperature in the hot spot area enters the phase change temperature range, while avoiding entering the high shear risk range. If it is greater than 0.9 m / s, the shear stress on the phase change microcapsules during circulation will increase, which will easily cause a simultaneous increase in coolant pressure drop and turbidity. If it is less than 0.9 m / s, the enhancement effect of convective heat transfer is limited, and it is difficult to fully activate the latent heat absorption capacity within the phase change temperature range.

[0094] When the temperature of the hot spot area during operation exceeds the upper limit of the phase change temperature range, the coolant circulation flow rate is kept constant, and the supply temperature is reduced by 3°C. The reduced supply temperature is recorded as the supply temperature control value for phase change.

[0095] The reason for choosing to lower the supply temperature by 3°C is that it can rapidly enhance the driving force of sensible heat transfer without changing the coolant circulation rate, causing the temperature of the hot spot area to drop from above the upper limit of the phase change temperature range. At the same time, it avoids excessive cooling that could cause drastic fluctuations in the operating status. If the temperature is greater than 3°C, the temperature of the hot spot area may drop rapidly out of the phase change temperature range, weakening the utilization of the latent heat of the phase change microcapsules and increasing the cold source load. If the temperature is less than 3°C, the effect of suppressing the temperature of the hot spot area is limited, and it is difficult to bring the operating status back to the phase change temperature range in time.

[0096] It should also be noted that when the temperature in the hot spot area exceeds the upper limit of the phase change temperature range, the liquid supply temperature should be reduced first.

[0097] The coolant circulation flow rate control values ​​for the first stage, the second stage, and the third stage are defined as the coolant circulation flow rate control values, and the supply temperature control values ​​for the first stage and the supply temperature control values ​​for the phase change are defined as the supply temperature control values.

[0098] After segmented adjustment, the cooling pressure drop and turbidity after segmented adjustment are collected.

[0099] It should also be noted that by dividing the comprehensive impedance index into different preset ranges and combining the hot spot temperature and phase change temperature ranges to implement segmented adjustment of the coolant circulation rate and supply temperature, the adjustment strategy can respond specifically according to the differences in the current operating state of the composite coolant, avoiding adjustment overshoot or response lag during continuous adjustment, and solving the problem of insufficient continuity and stability of coolant circulation rate and supply temperature adjustment in traditional control methods.

[0100] S4: Obtain the coolant pressure drop after segmented adjustment, the turbidity after segmented adjustment, the initial reference value, the coolant circulation flow rate control value, and the supply temperature control value to perform bypass filtration and maintenance operations on the composite coolant, and obtain the current coolant operating status parameters.

[0101] S4.1: Compare the coolant pressure drop and turbidity after segmented adjustment with the initial reference values, and perform bypass filtration on the composite coolant.

[0102] Furthermore, when the coolant pressure drop after segmented adjustment exceeds 120% of the initial reference value for coolant pressure drop, or when the turbidity after segmented adjustment exceeds 120% of the initial reference value for turbidity, it is determined that there are impurities or abnormal particles in the composite coolant that can be removed by filtration, and a bypass filtration operation is performed on the composite coolant.

[0103] The 120% threshold was chosen because it strikes a balance between normal operating fluctuations and the accumulation of substantial impurities or abnormal particles. This allows bypass filtration and maintenance operations to be triggered only when necessary without being frequently disturbed by short-term fluctuations. If the threshold is greater than 120%, it can easily lead to prolonged degradation of the composite coolant and affect temperature control. If the threshold is less than 120%, it can easily cause frequent bypass filtration and maintenance operations and increase the operating burden.

[0104] Under the condition that the coolant circulation flow rate control value and the supply temperature control value remain unchanged, a portion of the composite coolant is diverted from the main circulation path into the bypass flow path, and the composite coolant is filtered by the filter medium in the bypass flow path to complete the bypass filtration operation.

[0105] S4.2: After completing the bypass filtration operation, collect the coolant pressure drop and turbidity after bypass filtration, and compare them again with the initial reference values ​​for coolant pressure drop and turbidity. If the coolant pressure drop after bypass filtration exceeds 120% of the initial reference value for coolant pressure drop, or the turbidity after bypass filtration exceeds 120% of the initial reference value for turbidity, it is determined that the operating state of the composite coolant cannot be restored by bypass filtration alone, and maintenance operations are performed on the composite coolant.

[0106] Under the condition that the coolant circulation flow rate control value and the supply temperature control value remain unchanged, drain part of the composite coolant and add new composite coolant until the coolant pressure drop after maintenance does not exceed 120% of the coolant pressure drop reference value, and the turbidity after maintenance does not exceed 120% of the turbidity reference value in the initial reference value, and the maintenance operation is completed.

[0107] S4.3: After the bypass filtration operation and maintenance operation are completed, the cooling pressure drop, turbidity, hot spot temperature, supply temperature and load power are obtained again, and the current equivalent thermal resistance is calculated using the expression for calculating the equivalent thermal resistance after phase change microcapsule dispersion in step S1.2.

[0108] The current equivalent thermal resistance, the reacquired coolant pressure drop, and the reacquired turbidity are determined as the current coolant operating parameters.

[0109] It should also be noted that by continuously comparing the coolant pressure drop and turbidity after segmented adjustment with the initial reference values, and selectively performing bypass filtration or maintenance operations while keeping the coolant circulation flow rate control value and supply temperature control value unchanged, filterable impurities or abnormal particles in the composite coolant can be graded and treated, restoring the coolant operating state without interfering with the existing temperature control strategy, thus solving the problem of the difficulty in steadily restoring coolant performance in existing methods.

[0110] This embodiment also provides a computer device applicable to a temperature monitoring and regulation method based on a phase change microcapsule composite coolant, comprising: a memory and a processor; the memory is used to store computer-executable instructions, and the processor is used to execute the computer-executable instructions to realize the temperature monitoring and regulation method based on a phase change microcapsule composite coolant as proposed in the above embodiment.

[0111] The computer device can be a terminal, comprising a processor, memory, communication interface, display screen, and input devices connected via a system bus. The processor provides computing and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs stored in the non-volatile storage media. The communication interface is used for wired or wireless communication with external terminals; wireless communication can be achieved through Wi-Fi, carrier networks, NFC (Near Field Communication), or other technologies. The display screen can be an LCD screen or an e-ink screen. The input devices can be a touch layer covering the display screen, buttons, a trackball, or a touchpad on the computer device's casing, or an external keyboard, touchpad, or mouse.

[0112] This embodiment also provides a storage medium storing a computer program. When executed by a processor, the program implements a temperature monitoring and regulation method based on a phase change microcapsule composite coolant as proposed in the above embodiments. The storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read Only Memory (EPROM), Programmable Red-Only Memory (PROM), Read-Only Memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk.

[0113] In summary, this invention achieves the following: by calculating the comprehensive impedance index, the changes in heat transfer performance and flow resistance of the coolant under the current operating state can be uniformly quantified, avoiding the overshoot and hysteresis phenomena commonly found in single temperature control strategies, thus improving the continuity and predictability of temperature control and solving the problem of difficulty in coordinating the determination of changes in heat transfer capacity and flow resistance; furthermore, by continuously comparing the coolant pressure drop and turbidity, it enables the graded processing of filterable impurities and abnormal states of phase change microcapsules, which can restore the coolant operating state without interfering with the existing temperature control strategy, solving the problem of difficulty in achieving stable recovery of coolant performance.

[0114] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for temperature monitoring and regulation based on phase change microcapsule composite coolant, characterized in that: include, The temperature of the hot spot area, the supply temperature, the return temperature, the load power, the cooling pressure drop and the turbidity are obtained, and the equivalent thermal resistance after the phase change microcapsules are dispersed is calculated. The equivalent thermal resistance after the phase change microcapsules are dispersed, the cooling pressure drop and the turbidity are used as the initial reference values. Calculate the equivalent thermal resistance of the composite coolant during continuous circulation, and use the equivalent thermal resistance and coolant pressure drop during operation to calculate the comprehensive impedance index. Based on the comprehensive impedance index and the temperature of the hot spot area, the coolant circulation flow rate and supply temperature are adjusted in stages to obtain the coolant pressure drop, turbidity, coolant circulation flow rate control value and supply temperature control value after the stage adjustment. Based on the coolant pressure drop after segmented adjustment, the turbidity after segmented adjustment, the initial reference value, the coolant circulation flow rate control value, and the supply temperature control value, bypass filtration and maintenance operations are performed on the composite coolant to obtain the current coolant operating status parameters.

2. The temperature monitoring and regulation method based on phase change microcapsule composite coolant as described in claim 1, characterized in that: The specific steps for obtaining the hotspot area temperature, supply liquid temperature, return liquid temperature, load power, cooling water pressure drop, and turbidity are as follows. Phase change microcapsules are added to the coolant to form a composite coolant; The composite coolant is continuously circulated at a preset low circulation rate for a preset duration, and the temperature of the hot spot area, supply temperature, return temperature, load power, coolant pressure drop and turbidity are collected.

3. The temperature monitoring and regulation method based on phase change microcapsule composite coolant as described in claim 1, characterized in that: The specific steps for calculating the equivalent thermal resistance of the phase change microcapsules after dispersion are as follows. The temperature difference between the hot spot area and the liquid supply is calculated using the hot spot area temperature and the liquid supply temperature. The temperature difference value corresponding to a unit load power is calculated using the temperature difference and load power to obtain the equivalent thermal resistance of the phase change microcapsules after dispersion.

4. The temperature monitoring and regulation method based on phase change microcapsule composite coolant as described in claim 1, characterized in that: The calculation of the comprehensive impedance index using the equivalent thermal resistance during operation and the cooling pressure drop during operation is carried out in the following specific steps. The equivalent thermal resistance and cooling pressure drop during operation are made dimensionless to obtain dimensionless equivalent thermal resistance and dimensionless cooling pressure drop. The overall impedance index is calculated using dimensionless equivalent thermal resistance and dimensionless cooling pressure drop.

5. The temperature monitoring and regulation method based on phase change microcapsule composite coolant as described in claim 1, characterized in that: The specific steps of the segmented adjustment operation are as follows: The first, second, and third preset ranges are set based on the historical comprehensive impedance index, and the phase transition temperature range is set based on the hot spot temperature and equivalent thermal resistance. The coolant circulation rate and supply temperature are adjusted based on the comprehensive impedance index, the first preset range, the second preset range, the third preset range, the hot spot temperature range, and the phase change temperature range, and the coolant circulation rate control value and supply temperature control value are recorded.

6. The temperature monitoring and regulation method based on phase change microcapsule composite coolant as described in claim 5, characterized in that: The adjustment of coolant circulation rate and supply temperature based on the comprehensive impedance index, a first preset range, a second preset range, a third preset range, the temperature of the hot spot area, and the phase change temperature range is described in the following steps. When the comprehensive impedance index is within the first preset range, the coolant circulation flow rate is limited to the first predetermined range, and the supply temperature is reduced to obtain the supply temperature control value and the coolant circulation flow rate control value of the first stage. When the comprehensive impedance index is in the second preset range, the coolant circulation flow rate is limited to the second predetermined range, and the supply temperature is kept constant to obtain the coolant circulation flow rate control value in the second stage. When the comprehensive impedance index is in the third preset range and the temperature of the hot spot area is in the phase change temperature range, the coolant circulation flow rate is increased while the supply temperature remains constant to obtain the coolant circulation flow rate control value in the third stage. When the temperature of the hot spot area during operation exceeds the upper limit of the phase change temperature range, the coolant circulation flow rate is kept constant and the supply temperature is reduced to obtain the supply temperature control value for phase change. The coolant circulation flow rate control values ​​for the first stage, the second stage, and the third stage are determined as the coolant circulation flow rate control values, and the supply temperature control values ​​for the first stage and the supply temperature control values ​​for the phase change are determined as the supply temperature control values. After segmented adjustment, the cooling pressure drop and turbidity after segmented adjustment are collected.

7. The temperature monitoring and regulation method based on phase change microcapsule composite coolant as described in claim 1, characterized in that: The specific steps for bypass filtration and maintenance of the composite coolant are as follows. The coolant pressure drop and turbidity after segmented adjustment are compared with the initial reference values. When either the coolant pressure drop or the turbidity after segmented adjustment exceeds the preset ratio of the corresponding initial reference value, a bypass filtration operation is performed on the composite coolant. After bypass filtration is completed, collect the cooling pressure drop and turbidity after bypass filtration. The pressure drop and turbidity of the coolant after bypass filtration are compared with the initial reference values. If either the pressure drop or the turbidity exceeds the preset ratio of the corresponding initial reference value, maintenance is performed on the composite coolant.

8. The temperature monitoring and regulation method based on phase change microcapsule composite coolant as described in claim 7, characterized in that: The bypass filtration operation refers to diverting a portion of the composite coolant from the main circulation path to the bypass flow path while keeping the coolant circulation flow rate control value and the supply temperature control value constant, and using the filter medium in the bypass flow path to filter the composite coolant.

9. The temperature monitoring and regulation method based on phase change microcapsule composite coolant as described in claim 7, characterized in that: The maintenance operation refers to draining a portion of the composite coolant and replenishing it with new composite coolant, while keeping the coolant circulation flow rate control value and supply temperature control value unchanged, until the coolant pressure drop and turbidity after maintenance return to the preset ratio corresponding to the initial reference value.

10. The temperature monitoring and regulation method based on phase change microcapsule composite coolant as described in claim 1, characterized in that: The specific steps for obtaining the current coolant operating status parameters are as follows: After the cooling pressure drop and turbidity are restored to the preset ratio corresponding to the initial reference value, the cooling pressure drop, turbidity, hot spot temperature, supply temperature and load power are reacquired and the current equivalent thermal resistance is calculated. The current equivalent thermal resistance, the reacquired coolant pressure drop, and the reacquired turbidity are used as the current coolant operating status parameters.

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