| With the rise of Artificial Intelligence,the generation of all kinds of data requires great space for storage and calculation,and the speed of information transmission and the amount of data storage have been reached a record level.The data center,which is responsible for the storage and processing of large amounts of data,gradually presents the development trend of high heat flux and high energy consumption.The high heat flux generated by the server will cause the chip temperature to rise sharply,which challenges the safe and stable operation of the data center.The advanced data center thermal management system can not only ensure the safe operation of the server chip throughout the year,but also realize the adjustment of the operation mode of the refrigeration system combined with outdoor meteorological parameters,so as to reduce the energy consumption of the data center cooling system.Therefore,in order to improve the thermal management of data center,most scholars at home and abroad have carried out a variety of research.However,because most of the current research focuses on the construction and performance analysis of the enhanced heat transfer of liquid cooling radiator,the performance parameters of cooling water required for liquid cooling are not studied,and the relationship between the energy consumption of cooling water parameters required for liquid cooling and cooling system has not been established.Therefore,on the basis of strengthening the liquid-cooled heat sink structure and combining with the local climatic conditions in Tianjin,this article calculated and analyzed the energy consumption of the overall cooling system of the data center,proposed effective energysaving methods,and provided reference for the future research on the liquid-cooled cooling system of the server cabinet of the data center.According to the above theoretical and technical status quo,the research content of this paper is as follows:(1)COMSOL software was used to simulate the structure of the water-cooled heat sink,and the influence rule of the flow channel structure and the number of fins on the heat dissipation performance of the chip was analyzed.According to the design index of the heat sink,the optimal structure of the heat sink is determined,and then the optimal parallel mode of multiple groups of chips is determined.The simulation results show that the best performance structure is the horizontal long-runner water-cooled heat sink with rib spacing of 0.3mm.Compared with other structures,the comprehensive performance factor is up to about 41%.(2)A server cabinet model with 12 water-cooled radiator chips in parallel was established with the optimal structure of the chip water-cooled radiator as the unit.The numerical simulation results of the maximum temperature of chips in the data center server cabinet were compared with the experimental test results.The difference of the maximum temperature results of most chips is less than 15%,indicating that the model has a certain reliability.Then,a heat dissipation model with different numbers of chips connected in parallel is established,the corresponding operating power range is 0.625～7.5k W,the water flow range in the heat dissipation system is set at 0.03～0.16kg/s,and the inlet water temperature is 4～35℃ for various cooling water operations Working conditions,carry out numerical simulation research on the cooling performance of the cabinet,study the influence of different inlet water temperature and cooling water flow on the temperature of each group of chips,and determine the minimum cooling water flow required by the cabinet at the safe temperature of the chip.Further take the cabinet as a unit,connect multiple cabinets in parallel,and after changing the cooling water inlet parameters,fit the three-dimensional surface diagram of thermal power,inlet water temperature and minimum cooling water flow,and provide the cooling water required for safe operation of the cabinets under different working conditions.Parameter ranges provide guidance.(3)According to the annual climatic conditions of Tianjin,the cooling methods that can be used throughout the year are analyzed,the use conditions of different water-cooled operation modes are determined,and the switching of data center operation modes throughout the year is studied.the energy-saving potential of the data center is analyzed by calculating the annual operating energy consumption.The results show that the data center in the mixed refrigeration system mode is 1.11,and that in the single air-cooled water cooling unit refrigeration mode is 1.88,and the energy saving rate is 41%. |
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