Aquasar: A hot water cooled data center with direct energy reuse

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• 作者：Severin Zimmermann^a ; ^b ; Ingmar Meijer^b ; Manish K. Tiwari^a ; Stephan Paredes^b ; Bruno Michel^b ; Dimos Poulikakos^a ; ^{dimos.poulikakos@ethz.ch}
• 关键词：Electronic cooling ; Exergy ; Value of heat ; Hot water Cooling ; Energy reuse ; Green computing
• 刊名：Energy
• 出版年：2012
• 期刊代码：11_03605442
• 类别：pw
• 出版时间：July, 2012
• 卷：43
• 期：1
• 页码：237-245
• 文件大小：1231 K

摘要

We report the energy and exergy efficiencies of Aquasar, the first hot water cooled supercomputer prototype. The prototype also has an air cooled part to help compare the coolants's performances. For example, a chip/coolant temperature differential of only 15聽掳C was sufficient for chip cooling using water. The air cooled side, however, required air pre-cooling down to 23聽掳C and a chip/coolant temperature differential of 35聽掳C. Whereas extra exergy was expended for air pre-cooling, the higher thermal conductivity and specific heat capacity of water enabled coolant temperatures to be safely raised to 60聽掳C. Using such hot water not only eliminated the need for chillers, it also opened up the possibility of heat reuse. The latter was realized by using the hot water from Aquasar for building heating. A heat recovery efficiency of 80%and an exergetic efficiency of 34%were achieved with a water temperature of 60聽掳C. All these results establish hot water as a better coolant compared to air. A novel concept of economic value of heat was introduced to evaluate different reuse strategies such as space heating and refrigeration using adsorption chillers. It was shown that space heating offers the highest economic value for the heat recovered from data centers.