Research On Superficial Cluster CPU Gravity Heat Pipe Cooling System

In the context of the era of big data,data centers have become the major consumers of information society.According to statistics,the data center of modern information society will account for 5% of the total electricity consumption of the whole society,and about 2/3 of it is used for cooling and heat removal.After analyzing the energy consumption of the energy system in the equipment room,the energy consumption of the refrigeration equipment accounts for about 40% of the total energy consumption of the data center,and the largest heat dissipation component inside the server is the CPU of the central processing unit,which accounts for 75% of the overall heat dissipation of the server.Improvements are important for energy conservation and emission reduction.According to the theory of two-phase natural circulation theory,this paper designs a water-cooled refrigerant natural circulation radiator for the blade server CPU,and conducts in-depth experimental research to solve the heat transfer problem of high heat flow,small temperature difference and no power consumption in small systems.Firstly,the natural cycle analysis model of refrigerant is established to provide qualitative analysis for the design of CPU gravity heat pipe,and the key factors affecting the heat transfer performance of natural cycle of refrigerant are obtained,which provides guidance for experimental research.Based on the study of heat transfer enhancement characteristics and system performance of evaporator,the thermal resistance of the system is analyzed,and the key factors affecting heat transfer efficiency and the variation law of CPU core temperature are obtained.The results show that the inlet temperature and feed water flow affect the heat transfer performance of the condenser,the evaporator treatment surface affects the vaporization of the evaporator,and the refrigerant working substance type and charge affect the CPU.The flow of gravity heat pipe affects the overall heat transfer performance of CPU gravity heat pipe.According to the experimental results,the CPU gravity heat pipe can be optimized to meet the requirements of efficient and stable operation of the server.Finally,a computer room with liquid cooling mode is built according to the retrofitted CPU gravity heat pipe of the server,and the automatic control,danger alarm and real-time data monitoring and recording of the computer room system are realized by using PLC control technology.According to the data recording of the experimental system,the operation characteristics and energy consumption of the liquid cooling server system are analyzed,and the CPU gravity heat pipe is used to make the server at full load.Under the working conditions,the system can run steadily and continuously.By comparing and analyzing the two typical working conditions of the liquid-cooled server system and the air-cooled server system,the liquid-cooled heat dissipation accounts for 62%~65% of the total energy consumption of the liquid-cooled server,and saves 18813.6 kWh of the air-conditioning power consumption compared with the ordinary server in one hour,accounting for 68% of the air-conditioning power consumption of the ordinary server.The PUE value of the whole liquid-cooled server system ranges from 1.05 to 1.09,which is about 29% lower than the current PUE value of most network data centers,meeting the needs of building green data centers.