服务器CPU两相流微槽道冷却试验研究和节能分析

Experimental study and energy-saving analysis on cooling server's CPU with two-phase flow micro-channel

设计一套采用R134a制冷剂的两相流微槽道冷却系统,用于冷却高发热密度服务器CPU。搭建测试平台,测试和对比该系统在不同CPU负荷和制冷剂过冷度下的散热性能。测试结果表明,通过饱和温度为25~30℃的R134a两相流相变传热,可将发热密度为3 W/cm2,总散热量在50~150 W的CPU表面温度控制在50~60℃。根据实测的制冷剂泵、冷却水泵功耗,在不同气候条件下(选取典型气候区的若干城市为代表),该系统应用于大型数据中心服务器散热的全年理论能效比在10以上,远高于常规机房空调。

One cooling system with two-phase flow micro-channel is proposed for high heat flux server＇s CPU,using R134 a as refrigerant.A test platform is set up,the test and comparison are conducted on the cooling performance of this system under different loads of CPU and supercooling degree of the refigerant.The test results show that through the phase-changing heat transfer of two-phase flow using R134 a with saturated temperature of 25-30 ℃,a stable temperature range of 50-60 ℃ can be obtained for the CPU surface with heat flux of 3 W/cm^2 and heat dissipated of 50-150 W.Based on the power consumption of tested refrigerant pump and cooling water pump,applying this system to cooling the server in large data centers at different climate areas（several typical cities chosen from each climate area）of China,the theoretical annual energy ratio can be over 10,which is much higher than that of common air-conditioning in computer room.