The electric energy demand of data centers in Germany has grown rapidly from 10.5 TWh/a in 2010 to 13.2 TWh/a in 2017, an average of 25% of which are used to fulfill the data centers' cooling demand. In order to increase its energy efficiency, TU Darmstadt applies a new cooling concept in the next generation of its high‐performance computing data center “Lichtenberg II.” Instead of the current air‐cooled servers with water‐cooled rear doors at 17‐24°C, the new data center will be equipped with direct hot‐water cooling for the high‐performance computer, supplying heat at a temperature of 45°C. The high‐temperature waste heat is used for heating purposes on the university's campus Lichtwiese. For waste heat utilization, two concepts are presented, either integrating the heat in the return line of the district heating network or using it locally in buildings located near the data center. Reductions in CO₂ emission and annuity are generated both by decreased compression cooling demand for the data center and by decreased heat generation due to waste heat utilization. Depending on the scenario, a total of 20%‐50% of the waste heat emitted by the high‐performance computer can be used for heating purposes, while the remaining heat is dissipated efficiently via free cooling without additional energy demand for mechanical chillers. CO₂ emission can be decreased by up to 720 , representing a reduction of about 4% of the total emission at campus Lichtwiese. TU Darmstadt is currently implementing the waste heat integration into its district heating network and will benefit from this concept starting in 2020.

中文翻译：

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热水冷却数据中心的余热利用潜力：一个案例研究

德国数据中心的电能需求已从2010年的10.5 TWh / a迅速增长到2017年的13.2 TWh / a，其中平均25％用于满足数据中心的制冷需求。为了提高能源效率，达姆施塔特工业大学（TU Darmstadt）在其下一代高性能计算数据中心“利希滕贝格II”中采用了新的冷却概念。新的数据中心将取代用于高性能计算机的直接热水冷却系统，以提供温度为45°C的热量，而不是使用17-24°C的水冷后门的当前风冷服务器。 。高温废热用于大学校园的Lichtwiese的取暖目的。对于余热利用，提出了两个概念：将热量整合到区域供热网络的回流管线中，或在数据中心附近的建筑物中本地使用。减少二氧化碳₂排放和年金被压缩而减小冷却数据中心的需求和通过降低发热，由于废热利用产生两者。根据情况的不同，高性能计算机散发的废热总计可用于加热目的的20％-50％，而剩余的热量可通过自然冷却有效地消散，而无需额外的机械冷却器能耗。CO ₂排放量最多可减少720  ，相当于在利希特维斯校园减少约4％的总排放量。达姆施塔特工业大学目前正在将废热集成到其区域供热网络中，并将从2020年开始受益于这一概念。