Proceedings of the 2014 conference ICT for Sustainability

Supercomputers Keeping People Warm in the Winter

Mario Romero, Hanna Hasselqvist, Gert Svensson
Corresponding Author
Mario Romero
Available Online August 2014.
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Supercomputer, data center, waste heat recovery, heat exchanger, waste energy reuse, urban district heating and cooling, high-performance computing.
We present the design and evaluation of the heat recovery system for KTH’s Lindgren, Stockholm’s fastest supercomputer, a Cray XE6. Lindgren came into service in 2010 and has since been primarily used for complex numeric simulations of fluid mechanics and computational chemistry and biology. The heat exchange system collects the wasted heat from Lindgren’s 36,384 CPU cores and transfers it via the standard district heating and cooling system to a neighboring building which houses the Chemistry laboratories. We analyze the impact of Lindgren’s heat recycle system as a function of outside temperature and we estimate the system’s carbon emission savings. Since the original installation of Lindgren in 2010, it has become common practice to use water cooling systems for supercomputers, as water is a better heat transfer medium than air. We discuss the relevant design lessons from Lindgren as they relate to practical and sustainable waste heat recovery designs for today’s platforms. Finally, we estimate that the recovered heat from Lindgren reduced the carbon emissions by nearly 50 tons over the 2012-13 winter, the sample period of our analysis.
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ICT for Sustainability 2014 (ICT4S-14)
Part of series
Advances in Computer Science Research
Publication Date
August 2014
DOI to use a DOI?
Open Access
This is an open access article distributed under the CC BY-NC license.

Cite this article

AU  - Mario Romero
AU  - Hanna Hasselqvist
AU  - Gert Svensson
PY  - 2014/08
DA  - 2014/08
TI  - Supercomputers Keeping People Warm in the Winter
BT  - ICT for Sustainability 2014 (ICT4S-14)
PB  - Atlantis Press
SP  - 324
EP  - 332
SN  - 2352-538X
UR  -
DO  -
ID  - Romero2014/08
ER  -