L2A · Liquid-to-air
Trade shorthand for a closed-loop cold-plate system rejecting heat into the existing air plant: the drop-in retrofit path, bought at the price of a hard density ceiling.
Current numbers
~60 kW/rackclosed-loop L2A sidecar capacity (Google Brazos, announced June 2026; OCP open-sourcing in progress) with no facility-water re-plumb
~10–15 °Ccoolant-to-air approach temperature for liquid-to-air CDU coils (nominal; Vertiv CDU070 15 °C, Delta 10 °C) — the budget that caps warm-coil capacity
6.6xL2L heat-rejection capacity vs L2A, at under ~2x the cost at scale