伺服器節能之分區流場管理

Power Saving for Server from a Method of Regional Partition Development

近年來，資料中心的成長持續往上提高，其 IT 設備的耗能亦相當可觀，而資料中心主要由伺服器佔大部分，本研究以節能為出發點，針對伺服器以一種分區管理流場之方法以增加冷卻效率，達到節能之目的。本研究以CFD 方式進行分析，將IT 設備內之伺服器系統以分區之方法應用於將各發熱元件，各區可各自管理自己之流場以避免分流，甚至在已經有節能機制之風扇轉速控制下也有顯著的效果，以1 U 伺服器在35 度的環境溫度下，有分區管理可節省風扇耗能約31.0% 及減少系統風量使用約12.9%。當95 W CPU 在較少耗能76 W 的情況下，即使啟動風扇轉速控制機制後因節能而已經減少風扇轉速及電力31.2%，在使用分區管理流場後，風扇電力可從31.2% 再節省至46.2%，由結果來看，此分區管理流場之方法確實有效減少伺服器內風扇之耗能而達到節能之效果。

The quantity of data centers grows year by year. The power consumptionof IT equipment is huge. Servers are the main equipment of adata center. In this study, a divided zone method is developed to improvethe cooling efficiency for purpose of power saving. The analysis is bysimulation. A divided zone partition can concentrate airflow for keycomponents to avoid airflow bypass for better cooling, even when a FSC(fan speed control) function is already implemented for the system. Thepartition in a 1U server can save 31.0% of the total fan power consumptionand reduce the system airflow rate by 12.9% at 35 degrees Celsius ambient.For a specific load change in the server, the FSC function can save 31.2% of the fan power consumption when the CPU load is decreased from 95 Wto 76 W. Power savings can be enhanced from 31.2% to 46.2% after implementingthe divided zone partition with a FSC function. Obviously,the divided zone partition can introduce extra cooling efficiency to savemore power.