Project Horizon uses closed-loop, liquid-to-chip cooling. A coolant circulates in a sealed loop directly to the processors. Heat is carried out of the data hall by that coolant and rejected to ambient air at the chiller plant.
In practice, the coolant in the loop is reused continuously rather than consumed during operation. That is why the water usage for the buildings is extremely small (approximately the daily irrigation requirement for two acres of West Texas alfalfa) relative to different cooling mechanisms that allow water to evaporate.
Closed-loop cooling — schematic.
Coolant circulates in a sealed loop between the data hall and the chiller plant. Heat is rejected to ambient air at the chiller plant.
All campus water is sourced from non-potable groundwater sources, within existing permitted water allocations. The campus does not draw from the City of Fort Stockton's municipal supply.