About CDU Loop

CDU Loop builds engineering tools for liquid-cooled AI data centers. The calculators answer the questions that come up when a loop is designed, commissioned or changed: how long racks last when flow stops, how fast the standby pump must start, how warm the supply can run, and whether a flush reaches minimum velocity everywhere.

Who builds it

A licensed Professional Engineer with a background in turbomachinery, propulsion and thermal systems. The models are the same transient methods used for aircraft thermal management, applied to coolant distribution units and cold-plate racks.

Where the numbers come from

Rack data comes from public vendor and standards documents: Lenovo's GB300 NVL72 product guide and environmental tables, QCT's GB200 NVL72 paper, and the Open Compute Project's liquid cooling guidelines. Each value and its source is listed on the calculator page. Where no public number exists (cold-plate heat capacity, coolant volume inside the rack), the calculator uses an estimate and lets you replace it.

What it covers

The ride-through calculator models one rack with the supply temperature held steady. It was checked against a full network model of a 16-rack hall and agrees within 2% on ride-through and standby timing. It does not model your specific piping, valves or controls. For that, request a full loop scan from the calculator page.

Disclaimer

Results are engineering estimates for planning and review. They are not a design approval and do not replace the equipment vendor's requirements or a review by the engineer of record.