Facility water · FWS
The building's water loop that ultimately rejects heat to the outdoors, kept separate from the clean chip-cooling loop.
Also written as: FWS
Current numbers
~3–5 °CCDU heat-exchanger approach (FWS→TCS) as a design allowance; the OCP Project Deschutes 1.0.0 spec targets 3 °C at 2 MW
~45 °C in / ~55 °C out (Rubin example)chip-side DLC coolant in and out (NVIDIA Rubin example); facility water after the CDU runs a few degrees cooler
~41 °C FWS -> 45 °C rack coolantNVIDIA Vera Rubin example: 41 °C facility water into the CDU, 45 °C rack coolant