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Cooling

03 · Core systems

Heat has to go somewhere.

Water pouring out of a hand-driven mine adit in the Harz, wet rock and ferns around the openingCONCEPT

The campus and rack loops are closed. Designed to avoid potable water for primary data-centre cooling.

ArchitectureMine water at 10–12 °C, coupled to a closed campus loop.

Georgius Agricola · De re metallica, 1556 · e-rara

Boreholes, plate heat exchangers, coolant distribution, direct-to-chip, recovery, and a district heating interface. The Harz has engineered water for five hundred years, from Agricola to the mine adits; that is the tradition this design belongs to.

Cooling

  1. SOURCE
  2. LOOP
  3. CDU
  4. RACK
  5. HEAT EXPORT
Cooling loop, source to heat export

SpecificationCooling

Stand: 08/2026

Source temperature10–12 °C1
Available flow8,182 m³/day2
PUE, design target1.203
Warm loop, Quedlinburg25 / 35 °C4
Source, confirmedOpen · Engineering
Redundancy conceptOpen · Engineering
Water rights statusOpen · Engineering

03 · CoolingProof

Documents · Cooling note · the P&ID is restricted.

The figures above are source data, not our measurements. Hydrogeology and the water-rights status are being confirmed.

Control

Monitored in real time, and reported under the Energy Efficiency Act.

03 · CoolingApplication by location

in progressCampusCampus loop.
in progressQuedlinburgBuilding loop, existing asset.

Notes

  1. 110–12 °C – VERIFIED EXISTING (OFFICIAL DATA) · effective 06/2026 · source: Project data sheet · verified 06.08.2026
  2. 28,182 m³/day – VERIFIED EXISTING (OFFICIAL DATA) · effective 06/2026 · source: Project data sheet · verified 06.08.2026
  3. 31.20 – DESIGN BASIS (DESIGN BASIS) · effective 08/2026 · source: Technical concept · verified 13.08.2026
  4. 425 / 35 °C – DESIGN BASIS (DESIGN BASIS) · effective 07/2026 · source: Cooling calculation · verified 13.08.2026

Document status · Revision 1.0 · Last factual review 13 Aug 2026

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