What Is Heat Rejection?_
In liquid cooling, heat rejection occurs after the coolant absorbs heat from GPU components and flows to a heat exchanger (e.g., a dry cooler or facility water loop interface). The heat is then dissipated to the outside environment or building chilled water system. Effective heat rejection is critical to maintaining coolant temperatures within OEM-specified limits for high-density GPU clusters.
Technical Details
Heat rejection systems typically use a liquid-to-air or liquid-to-liquid heat exchanger, with fans or pumps moving the secondary fluid. The design must account for ambient temperature, humidity, and facility water conditions as specified by the cooling system manufacturer. In data-center deployments, heat rejection capacity is matched to the total thermal load of the rack, often with redundancy per the facility's cooling architecture. Proper flow rates and pressure drops across the heat exchanger are verified during commissioning against the OEM's performance curves.
How Leviathan Systems Works with Heat Rejection
During Leviathan Systems field commissioning, we verify heat rejection by measuring coolant temperatures at the rack inlet and outlet, and confirming that the facility loop or dry cooler maintains the required delta-T. We also inspect for any air pockets or blockages in the heat rejection circuit that could reduce efficiency.
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