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Support / Technical answers
Direct, data-backed answers to the questions that matter before and during deployment.
A CDU is the interface and control node of a liquid-cooling system: a plate heat exchanger thermally isolates the IT secondary loop from the facility primary side, pumps drive coolant to capture chip heat, and filtration, venting, make-up, leak detection and interlocks are integrated. Size it from the loop and fault domain it serves — rack-level L2L CDUs cover 30-500 kW, L2A 10-80 kW.
Secondary pumps drive coolant through cold plates and manifolds; the heat exchanger transfers heat to facility water or outdoor rejection; filtration protects microchannels, venting removes air, monitoring and interlocks protect against flow loss and leaks.
Size from rack load and profile: 50-100 kW racks take rack-level CDUs (30-500 kW); larger deployments use in-row or facility-level units (0.5-2.3 MW). Check secondary flow (about 1.0-1.5 LPM/kW) and available pressure.
L2L depends on facility-water quality and temperature windows; L2A needs room sensible-heat and noise review. Commissioning covers venting, flushing, water quality, leak and power recovery.