Liquid Cooling, the Thermal Foundation of High-Density AI Compute

Liquid cooling rewrites the heat boundary of dense compute: single AI chips have passed 700 watts and rack power moves toward 400 kilowatts where air cooling faces heat flux limits, density capped around a dozen kilowatts and rising fan energy, and a liquid-cooled server runs as a closed loop of cold plate, CDU, pump, manifold and couplings. Three routes answer heat remo...

CDU selection opens with central versus distributed, the hardest decision to reverse: central units sit outside the racks with secondary piping and must hold rack-to-rack differences within about 10 percent, while distributed units ride in each rack, remove secondary piping and confine an outage to one cabinet. Redundancy carries the trap that cold plate servers often ho...

The CDU works not by producing cold but by transferring heat between the outdoor cold source and the server loop through controlled exchange, and the design rests on two independent loops joined by a plate exchanger so fluids never mix: the primary loop runs to the cooling tower, dry cooler or chiller at 15 to 22 degrees, and the secondary loop carries a dedicated insula...