数据中心地板高度对空调送风特性的影响
Impact of floor height on air supply characteristics of air conditioning systems in data centers
摘要：
通过实验和数值模拟分析，从送风均匀性及精密空调运行工况的角度出发，讨论了不同功率、开放通道和封闭冷通道下，地板高度对数据中心机房地板送风特性及空调制冷效率的影响。研究表明：地板高度为400~1 000 mm时，开放通道和封闭冷通道下，地板越高送风越均匀；地板高度增加，空调回风温度也逐步增加，开放通道时影响幅度要大于封闭冷通道，封闭冷通道比开放通道普遍回风温度高2 ℃左右；IT负载容量不变时，地板高度变化对空调总风量的影响不明显，但通孔地板的出风趋于均匀，空调风量仅与IT负载功率有关。
Abstract：
Through test and numerical simulation analysis, from the perspectives of air supply uniformity and the operating conditions of the precision air conditioner, discusses the impact of floor height on the characteristics of underfloor air distribution and cooling efficiency of air conditioning in data centers in the cases of open and closed cold aisles with different powers. The results show that when the floor height is 400-1 000 mm, the higher the floor height, the more uniform the air supply no matter the aisle is open or not. The return air temperature rises along with the increase of the floor height which is more obviously when the aisle is open. Under the condition of closed cold aisle, the returned air temperature is 2 ℃ higher than that with open aisle. The total air rate is not changeable with the floor height when the IT load is constant. Meanwhile, the air velocity of the perforated floor tends to be uniform, and the air rate is only related to the IT load power.
Keywords:datacenter,underfloorairdistribution,floorheight,airsupplycharacteristic,simulationandexperimentalcomparison