From Chip to Cooling Tower Data Center Modeling: Influence of Air-Stream Containment on Operating Efficiency
From Chip to Cooling Tower Data Center Modeling: Influence of Air-Stream Containment on Operating Efficiency
复制标题
从芯片到冷却塔数据中心建模：气流遏制对运行效率的影响
DOI：
--
复制
发表时间：
2012
期刊：
影响因子：
--
通讯作者：
N. Kumari
中科院分区：
文献类型：
--
作者：
T. J. Breen;E. Walsh;J. Punch;Amip Shah;C. Bash;B. Rubenstein;Scot Heath;N. Kumari
在提高数据中心能效的努力中，热通道冷通道提升地板布置中的气流遏制前景受到了极大关注。这种密封防止了气流再循环，消除了冷热气流的混合效应，因为冷热气流会在设备机架的入口处造成不必要的温度升高。业界的直观评估是，消除此类混合影响可通过以更高的入口温度输送空气，从而减少所需的基础设施冷却量，从而提高数据中心冷却系统的能效。本文采用端到端的建模方法，分析了机房内气流围堵的效果及其对系统整体效率的影响。无因次热指数参数被用来表征机房环境中安全壳、再循环和混合的影响。结果表明，再循环的程度主要影响机架和CRAC级冷却系统的运行，冷水机组系统也会受到影响。对整个冷却系统性能和数据中心效率的整体影响需要平衡这些影响。通过该模型分析表明，在某些情况下，安全壳可能会对整体能效产生负面影响，而在某些系统相关的操作阈值下，再循环实际上可能对整体能效有利。版权所有：ASME版权所有©2011
In the drive to enhance data center energy efficiency, much attention has been placed on the prospect of airflow containment in hot-aisle cold-aisle raised floor arrangements. Such containment prevents airflow recirculation, eliminating the mixing effects of the hot and cold air streams that can cause an undesirable temperature rise at the inlet of the equipment racks. The intuitive assessment of the industry has been that the elimination of such mixing effects increases the energy efficiency of the data center cooling system by enabling delivery of air at higher inlet temperatures, thus reducing the amount of infrastructure cooling required. This paper employs an end-to-end modeling approach to analyze the effect of air stream containment in the computer room and its impact on the holistic system efficiency. Dimensionless heat index parameters are employed to characterize the effects of containment, recirculation and mixing within the computer room environment. The extent of recirculation is shown to primarily influence the operation of the rack and CRAC level cooling systems, with the chiller systems also impacted. The overall effect on the complete cooling system performance and data center efficiency requires balancing of these effects. Through this model analysis, it is shown that containment may negatively impact overall energy efficiency in some circumstances, and that recirculation may actually be beneficial to overall energy efficiency under certain system dependent operating thresholds.Copyright © 2011 by ASME