Why it matters

Cooling limits density. Understanding shapes buildouts.

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The architecture

Air: CRAC/CRAH + hot/cold aisles.

Liquid: rear-door heat exchanger, cold plate, immersion.

Cooling evolutionAir coolingup to 30kW/rackLiquid transitionrear-door / DLCImmersion1-2 phaseModern H100/B200 racks need direct liquid or immersion
Cooling.
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How it works end to end

Air: 15-30kW/rack ceiling.

Rear-door HX: bridge to ~50kW.

Direct liquid cooling (DLC): to 120kW+.

Immersion: highest density.