Editorial review 2026-09-10 · Jurisdiction: General technical orientation; Swedish examples
Cooling technologies
Air, mixed and liquid systems win in different rooms. Free cooling in a northern climate is a design opportunity, not a permit. Liquid loops help high-density racks and can raise the temperature of recoverable heat. They also add fluids, CDUs and a rejection path. atNorth SWE01 describes direct liquid cooling and heat recovery with Stockholm Exergi. That is an operator description of one hall, not a ranking of Sweden.
General orientation. Assess the specific project separately. Applies to: Readers comparing cooling claims in Swedish files.
Compare on assumptions
Do not declare a national winner. Declare which assumption set you used.
- IT density the system is designed for.
- Water use, if any, and the source.
- Where heat is rejected — air, tower, or district network.
- Whether heat reuse is piped, contracted, or delivered.
Sources
- SWE01 Stockholm metro site — atNorth, 2026-01-01. Checked 2026-09-10.
- Welcome to Facebook Luleå Sweden — Meta Careers, 2013-06-12. Checked 2026-09-10.
- GleSYS Falkenberg data center — GleSYS, 2026-01-01. Checked 2026-09-10.