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CN-121975497-A - Composite cooling liquid for data center server thermal management system and preparation method and application thereof

CN121975497ACN 121975497 ACN121975497 ACN 121975497ACN-121975497-A

Abstract

The invention provides a composite cooling liquid for a data center server thermal management system, and a preparation method and application thereof. The composite cooling liquid comprises a basic cooling liquid, phase-change microcapsules, a dispersion stabilizer and optional other additives, wherein the basic cooling liquid is a fluorinated liquid, the phase-change microcapsules take polymethyl methacrylate as a wall material, n-octadecane as a core material, and the dispersion stabilizer is PEG, PAA or PEI. The invention solves the problems of limited heat capacity, easy sedimentation and agglomeration of phase-change microcapsules, insufficient mechanical stability, poor chemical compatibility and the like of the traditional cooling liquid, has excellent dispersion stability (no sedimentation or layering in 6 months), mechanical reliability (no turbidity or precipitation after cyclic test, and capsule breakage rate of < 3%) and thermal performance (specific heat capacity of > 2J/(g, K)), and completely meets the use requirement of a thermal management system of a data center server.

Inventors

  • ZENG YIZHENG
  • TAN YAQING
  • WU JIEDA

Assignees

  • 海斯福(深圳)科技有限公司

Dates

Publication Date
20260505
Application Date
20260127

Claims (10)

  1. 1.A composite coolant for a data center server thermal management system, comprising the following components in parts by weight: 70-95 parts of basic cooling liquid; 3-25 parts of phase-change microcapsule; 0.5-5 parts of dispersion stabilizer; 0-2 parts of other additives; the basic cooling liquid is a fluoridation liquid.
  2. 2. The composite cooling liquid according to claim 1, wherein the mass ratio of the base cooling liquid, the phase-change microcapsules and the dispersion stabilizer is (7-9): 1 (0.2-0.4).
  3. 3. The composite cooling fluid of claim 1, wherein the fluorinated fluid is selected from one or more of a hydrofluoroether or a perfluoropolyether.
  4. 4. The composite coolant of claim 3, wherein the hydrofluoroether is selected from one or more of HFE347, HFE458 or HFE6512 and the perfluoropolyether is selected from one or more of K-type, Y-type, Z-type and D-type perfluoropolyethers.
  5. 5. The composite coolant of claim 1, wherein the phase change microcapsules are made of polymethyl methacrylate (PMMA) as a wall material and n-octadecane as a core material.
  6. 6. The composite coolant of claim 1, wherein the dispersion stabilizer is selected from one or more of polyethylene glycol (PEG), polyacrylic acid (PAA), or Polyethylenimine (PEI).
  7. 7. The composite coolant of claim 1, wherein the other additives are selected from one or more of corrosion inhibitors, defoamers, antioxidants.
  8. 8. A method of preparing a composite coolant for a data center server thermal management system as claimed in any one of claims 1 to 7, comprising the specific steps of: S1, preparing concentrated slurry, namely mixing a part of basic cooling liquid with all dispersion stabilizers to prepare premix, slowly adding the weighed phase-change microcapsules into the premix in batches, simultaneously stirring at a low speed of 100-300rpm for 0.5-1h, and stirring at a high speed of 400-800rpm for 1-3h to obtain stable phase-change microcapsule concentrated slurry; s2, diluting and blending, namely adding the rest basic cooling liquid into the phase-change microcapsule concentrated slurry prepared in the step 1, adding other additives, setting the stirring speed to be 100-400rpm, and circularly stirring at a low speed for 2-4 hours to ensure that all components are fully and uniformly mixed, and finally obtaining the high-stability composite cooling liquid.
  9. 9. The method for preparing a composite cooling liquid according to claim 8, wherein the mass ratio of the basic cooling liquid in the step S1 to the basic cooling liquid in the step S2 is (4-6): 6-4.
  10. 10. Use of a composite coolant for a data center server thermal management system according to any one of claims 1 to 7 or a composite coolant obtained by the method for preparing a composite coolant for a data center server thermal management system according to claim 8 in a data center server thermal management system.

Description

Composite cooling liquid for data center server thermal management system and preparation method and application thereof Technical Field The invention relates to the technical field of thermal energy engineering and thermal management, in particular to a composite cooling liquid for a data center server thermal management system, and a preparation method and application thereof. Background With the continuous increase of the computing power of the data center, the power density of the server is continuously increased, and the problem of thermal management becomes a key factor for restricting the operation efficiency, the service life and the safety of the data center. At present, a liquid cooling technology is generally adopted in a data center, and most of core cooling mediums are ethylene glycol aqueous solution, deionized water or organic silicone oil and other traditional fluids. The heat transfer mechanism of these traditional coolants mainly relies on self sensible heat (specific heat capacity) to absorb heat, and the heat capacity is limited. When the instantaneous high power and pulse heat load generated in the running process of the server is faced, the temperature of the traditional cooling liquid rises rapidly, so that the temperature of equipment is easily overhigh or larger temperature fluctuation occurs, the running performance of the server can be reduced, the aging of hardware can be accelerated, and even potential safety hazards are caused. In order to solve the problems, related researches propose adding high-heat-conductivity nano particles (such as nano aluminum and carbon nano tubes) into cooling liquid to improve the heat conductivity coefficient, but the nano particles have inherent defects of easy agglomeration, poor sedimentation stability and obvious attenuation of performance after long-term cyclic use, and meanwhile, the nano particles can generate abrasion action on pipelines and equipment parts and also can cause electrochemical corrosion, so that the maintenance cost of a system is increased, and the nano particles are difficult to popularize in a large scale in practical industrial application. Currently, the introduction of phase change microcapsules into a cooling fluid is an ideal technical path for increasing the heat capacity of the fluid. The phase change microcapsule utilizes the characteristic that a large amount of latent heat is absorbed or released in the phase change process of the core material, and can greatly improve the apparent specific heat capacity of the fluid, thereby enhancing the heat absorption capacity and the temperature control effect of the cooling liquid. However, the technical path faces three major core technical bottlenecks in practical application, which limits the industrialized application of the technical path: The sedimentation and agglomeration stability is poor, namely the density of the phase-change microcapsule particles is not matched with that of the base liquid, sedimentation and agglomeration are easy to occur under the action of gravity, so that a pipeline or a runner is blocked, the cooling liquid is invalid, and the normal operation of a thermal management system is influenced; The mechanical stability is insufficient, namely, the cooling liquid can be subjected to strong shearing force when flowing in equipment parts such as a circulating pump, a valve and the like, so that the shell of the phase-change microcapsule is easy to break, and the core phase-change material is easy to leak. The leaked phase change material can react with other additives to separate out solid impurities, which further cause system blockage and corrosion; the shell material of the phase-change microcapsule can be subjected to chemical reactions such as swelling, dissolution and the like with functional additives (such as corrosion inhibitors and antioxidants) in basic cooling liquid or a system, so that the structural integrity of the capsule is damaged, and the phase-change heat storage function of the capsule is lost. Therefore, it is needed to develop a phase change microcapsule composite cooling liquid capable of simultaneously solving the problems of dispersion stability, mechanical stability and chemical compatibility, and successfully apply the phase change microcapsule composite cooling liquid to a severe thermal management environment of a data center server, which has important practical significance. Disclosure of Invention In order to overcome the defects and the shortcomings of the prior art, the invention aims to provide a composite cooling liquid for a data center server thermal management system, which has the advantages of stable long-term dispersion, high mechanical strength, good chemical compatibility and high specific heat capacity, and a preparation method and application thereof, and solves a series of problems of insufficient heat capacity, easy sedimentation and agglomeration of phase-change microcapsules, poor mechanical stabi