應用氣簾改善小型數據中心熱回流之實驗分析

Abstract

本研究主要探討以加裝氣簾裝置應用於改善天花板供風之小型機房過熱和熱回流情形，以實驗方式針對氣簾供風角度，供風速度，供風量與抽風量關係進行探討，其中包括氣簾供風角度為+20°，0°，-20°、供風速度為12m/s，10m/s，8.5m/s，7m/s、供風量等於，大於，小於抽風量，機房發熱量設定為50kW，機房內包含10台機櫃和開啟5個供風口，每台機櫃皆以42個風扇進行強制對流，結果顯示，在供風量等於抽風量的條件下，氣簾工作角度為0°，工作速度為12m/s時，機櫃過熱程度最低，可將RCI從47%提高至67 %，其中A1與A2機櫃過熱程度也達到最低，RCI值分別為65%與62%。在供風量大於抽風量的條件下，氣簾工作角度為0°，工作速度為12m/s時，A1與A2機櫃過熱程度最低，其中RCI值分別為60%與61%。在供風量小於抽風量的條件下，氣簾工作角度為0°，工作速度為12m/s時，A1與A2機櫃過熱程度最低，其中RCI值分別為36%與33%。

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.