What Is Coolant Supply Temperature?_
Coolant supply temperature is a key parameter in liquid cooling systems, typically set at the facility-level coolant distribution unit (CDU) and monitored at the rack inlet. It directly affects the heat removal capacity and the operating temperature of GPUs, with lower supply temperatures enabling higher thermal margins but requiring more chiller energy. The target supply temperature is usually specified by the GPU system OEM to ensure reliable operation and prevent condensation.
Technical Details
Coolant supply temperature is measured at the rack's liquid inlet manifold, often using inline temperature sensors that feed data to the CDU controller. The difference between supply and return temperatures, along with flow rate, determines the heat load removed from the rack. For high-density GPU systems like the NVL72, the supply temperature is typically set within a narrow range (e.g., 20–30°C) to balance cooling performance and energy efficiency, as per the OEM spec. The supply temperature must be maintained above the dew point to avoid condensation on cold surfaces inside the rack.
How Leviathan Systems Works with Coolant Supply Temperature
During rack assembly and commissioning, Leviathan Systems field crews verify that the coolant supply temperature matches the site's CDU setpoint and that temperature sensors are correctly wired and calibrated. We also check that the supply temperature is stable before powering on GPUs, as fluctuations can trigger thermal throttling or alarms.
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