直接接触冷板式液冷在数据中心的节能分析

Energy-Saving Analyses on Direct Contact Liquid Cooling System in Data Centers

对分布在不同热工区属的中国36个城市中配置二次侧集中循环直接接触冷板式液冷辅助精密空调风冷散热系统的样本数据中心进行节能分析。建立了能耗计算模型,计算出不同城市的制冷散热系统的年部分电能使用效率(partial power usage effectiveness,pPUE)值,计算结果显示所有样本城市的pPUE值均低于1.13,系统节能且全国各地都适用。分析发现:pPUE值与系统中极端低温决定的乙二醇溶液浓度基本成本正比,浓度越高pPUE值越高;而同一气象区属城市采用直接接触冷板式液冷后系统的pPUE值降低率则与海拔高度基本成正比关系,海拔越高pPUE值降低率越高,采用液冷的节能效益越发凸显;降低风冷散热比例及提高风冷散热能效可进一步降低该系统pPUE值。

Energy-Saving analyses on the secondary centralized pumping direct contact liquid cooling system with auxiliary heat dissipation by computer room air conditioners in data centers which are located in 36 different cities belonging to different meteorological districts in China are carried out.An energy consumption calculation model of the system is established,and partial power usage effectiveness(pPUE)values of different cities are given.The results show that pPUE values of all the cities are smaller than 1.13 and that the system is quite energy-saving and applicable to the whole country of China.Further analyses show that pPUE value is nearly proportional to the concentration of glycol solution which is determined by the extremely low temperature of each city.In addition,the higher the concentration is,the higher the pPUE value will be.Furthermore,the decrease ratio of pPUE value adopting direct contact liquid cooling system in different cities of the same meteorological district is proportional to the altitude above the sea level of the cities,and the higher the altitude above sea level of the cities is,the larger the decrease ratio of pPUE value will be.Therefore,the energy-saving benefit of direct contact liquid cooling system in those cities is more obvious.It is also pointed out that lowering the proportion of heat dissipation by computer room air conditioners and increasing the efficiency of computer room air conditioners can further contribute to the decrease of the pPUE value of the system.