Instability issues in the server room cooling system

  • Tomasz Kwiatkowski National Centre For Nuclear Research
  • Piotr Prusinski National Centre for Nuclear Research
  • Dariusz Zgorzelski National Centre for Nuclear Research
  • Sylwester Kozioł National Centre for Nuclear Research


Since 2009, the National Center for Nuclear Research in Poland has been constructing its own High Performance Computing(HPC) Centre under the name S´wierk Computing Centre (CIS´ ). Now, it is ready reaching its target—1 PFLOPS—in December2015. However at the early operation stage, one of its major problems was the unstable work of the HPC cluster coolingsystem, resulting in increased maintenance costs. The main aim of this work is to thoroughly investigate the origin of theproblem and to find the best solution for it based on results from a Computational Fluid Dynamics (CFD) analysis. Theconstructors suspected that the oscillations in the flow domain are caused by thermal flow stratification, but something elsewas proved. In this paper, a wide range of cases will be analyzed, covering different work regimes of the installation as wellas various geometry modifications. Finally, certain improvement to the current design will be suggested by the CFD AnalysisGroup.


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How to Cite
KWIATKOWSKI, Tomasz et al. Instability issues in the server room cooling system. Journal of Power Technologies, [S.l.], v. 97, n. 3, p. 252-258, nov. 2017. ISSN 2083-4195. Available at: <>. Date accessed: 05 aug. 2021.
Energy Conversion and Storage


HPC, computer cluster, efficient cooling, CFD

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