液冷温控单元循环泵切换方案对系统稳定性影响的试验研究

Experiment on effect of circulating pump switching scheme for coolant distribution unit on system stability

针对液冷服务器运行不能断液特性,采用双泵式液冷温控单元(CDU)试验装置,进行热备和冷备运行模式不同轮询切换和故障切换试验,分析系统压差、流量、负载出液温度的变化,为液冷服务器的可靠安全运行提供可借鉴的循环泵切换方案。结果表明:循环泵热备模式的调节响应和重新调节稳态效果优于冷备模式。针对正常状态在线运转液冷温控单元数量不少于2台的单泵式CDU并联液冷系统,冷备模式循环泵可借鉴LL4和LG3切换方案。采用多台双泵式CDU并联液冷系统,若CDU之间采用热备模式,则单CDU内双循环泵可采用LL4切换方案,但需要将不同CDU内循环泵轮询切换时间错开设置,避免多台循环泵同时切换。

In view of the operating characteristics of the liquid cooling server,that is the working fluid cannot stop flow at run time,the double pump coolant distribution unit(CDU)test device is adopted to carry out different tests of polling switching and fault switching of hot standby and cold standby operation modes,to analyze the changes of system pressure difference,flow rate and load outlet-fluid temperature,thus providing a reliable and safe reference scheme of circulating pump switching for the liquid cooling server.The results show that the regulation response and the readjust steady-state effect of hot standby mode of circulating pump are better than that of cold standby mode.Adopting the single pump CDU parallels liquid cooling system,the circulation pump in cold standby mode can learn from the switching scheme LL4 and LG3 on the premise of ensuring that the number of CDU online in normal operation is not less than two.Adopting multiple double pump CDU parallels liquid cooling system,if hot standby mode is adopted between CDU,the switching scheme LL4 can be adopted for double circulating pump in single-CDU,but the polling switching time of circulating pumps in different CDU shall be staggered to avoid simultaneous switching of multiple circulating pumps.