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An L2A CDU rejects secondary-loop heat to room air or outdoors through a liquid-to-air heat exchanger — deployable without facility water, ideal for retrofits and no-chiller sites. Mainstream units run 70 kW class (10-80 kW); verify room sensible capacity, air
Direct liquid cooling usually covers only major heat sources; memory, power, networking and auxiliary devices still generate heat. Quantify residual air heat and make the boundary explicit: uncovered heat is removed by rack airflow or captured by rear-door hea
Quick connects concentrate leak risk. Per OCP UQD v1.0: working pressure 0-600 kPa, cycle life ≥5,000, fluid loss ≤0.07 mL per cycle (UQD08 limit), 100% helium leak testing at production. Self-sealing on disconnect, bubble-free on connect; blind-mate versions
In L2L systems, primary (facility) and secondary (IT loop) water quality must be managed separately: facility water quality, particulates and pressure swings must not enter the secondary. The CDU isolates via a plate heat exchanger; the secondary runs its own
Redundancy and fault domains define availability: N+1 pumps keep the rack running through a single failure (flow/pressure recovery ≤30 s per industry practice), and branch-level isolation lets one node be serviced without stopping the rack. Design makes explic
Condensation is a hidden risk: when cold-plate surface temperature falls below the room dew point, moisture condenses and can short electronics. Controls: supply temperature above dew point (typically 3-5 °C margin), insulation on cold plates and lines, humidi
Acceptance runs on measured data across five areas: venting and flushing, water quality, flow/pressure/temperature, leak and power recovery. A 550 W-class cold plate is accepted on measured temperature and pressure drop (91 °C / 5.8 kPa); racks close with full
A chip-level direct-liquid cold plate for GPUs, CPUs and AI accelerators. Microchannel, jet-impingement or hybrid flow paths can be developed around the device heat map, mechanical envelope, flow and pressure-drop budget, with evidence built through simulation, prototypes and liquid-loop testing.
Integrates heat exchange, pumping, filtration, monitoring and controls between the IT secondary loop and facility cooling.
Distributes supply and return flow to server nodes with branch balancing, pressure drop, quick connections, isolation and service access considered.
Combines rack manifolds, piping, filtration, monitoring and CDU interfaces into an isolatable, air-managed and serviceable secondary loop.
Integrates pumps, valves, filtration, sensing and controls around system flow, differential-pressure and redundancy requirements.