Experimental Analysis of Reducing the Effect of Hot Air Recirculation in Small-Scale Data Center by Using Air Curtain
|關鍵字:||氣簾;天花板供風;小型資料中心;RCI;SHI;Air curtain;CRAH flow rate;Small-scale data center;Racks flow rate;RCI;SHI|
The objective of this study is to reduce the effect of hot air recirculation in a small-scale data center by using air curtain. The influence of the inclination angle of air curtain and injection air speed is examined. The associated effects on the efficiency indexes such as rack cooling index, supply heat index and return heat index are also reported in this study. The inclination angles of air curtain include +20°, 0° and -20° with air curtain speed being in 12 m/s, 10 m/s, 8.5 m/s and 7 m/s, respectively. The total power of data center is fixed at 50 kW and is uniformly distributed in 10 racks. Each rack contains 42 fans, and tests are performed with CRAH flow rate being equal, smaller, or larger than the supplied airflow in the rack. The phenomenon of racks overheating and hot air recirculation are at the lowest level (from 47% to 67%) when test is performed at the air curtain having an inclination angle of 0° and an air curtain speed of 12m/s. At the same time the phenomenon of overheating and the effect of hot air recirculation in A1 and A2 racks reach the lowest level with RCI of 65% and 62% respectively. When the CRAH flow rate is larger than racks flow rate with the conditions of air curtain inclination angle of 0° at an air curtain speed of 12 m/s, the phenomenon of overheating and the effect of hot air recirculation in A1 and A2 racks reaches the lowest level with RCI 60% and 61%, respectively. When the CRAH flow rate is smaller than racks flow rate with the conditions of air curtain inclination angle of 0° and the air curtain speed of 12 m/s, the phenomenon of overheating and the effect of hot air recirculation in A1 and A2 racks reach the lowest level with RCI 36% and 33% respectively.
|Appears in Collections:||Thesis|