DCX puts chemical treatment inside the AI cooling unit

A data-centre cooling unit can now arrive with its own chemical-dosing pumps. On 14 October, DCX announced built-in coolant monitoring and treatment for its Facility Distribution Unit family, rated for 5–8 megawatts of heat transfer. The company says the feature is available immediately.[1]

The unit separates two liquid circuits. Facility water carries heat towards the building’s cooling equipment; a closed technology loop carries it away from the servers’ cold plates. A heat exchanger passes heat between the circuits while keeping their fluids apart. The fluid on the server side has its own maintenance requirements.[2]

The fluid is part of the equipment

Open Compute Project guidance treats glycol coolant as a formulation: propylene glycol, water and inhibitors matched to the metals they touch. Its specification links the liquid to seals, connectors and other wetted components. Changing those materials during a hardware refresh can require the fluid’s compatibility to be reassessed.[3]

This gives fluid monitoring several separate jobs. Dynalene’s laboratory programme distinguishes glycol concentration, acidity, buffering capacity, electrical conductivity, particles, inhibitors and dissolved contaminants. Its OCP presentation describes testing sensors against deliberately disturbed coolants: the diagnostic meaning of a reading depends on the formulation and the disturbance.[4]

DCX’s announcement names measurements including pH, conductivity, turbidity, glycol concentration and corrosion rate. Three dosing channels supply inhibitors, pH-control additives and biocides. The machine therefore combines readings with a way to act on the liquid, with doses counted and logged.[1]

A top-up changes more than the level

In DCX’s described control sequence, a pH correction is followed by a wait for mixing before another correction. Fresh make-up fluid triggers inhibitor and biocide dosing in proportion to the volume added. The illustrated dashboard values are demonstration settings, not readings from an operating customer installation.[2]

An original dilution example shows why concentration needs its own measurement. Suppose a well-mixed loop contains 1,000 litres of fluid at 25% glycol by volume. Removing 100 litres removes 25 litres of glycol. Replacing that volume with pure water leaves 225 litres of glycol in 1,000 litres: 22.5%. This simplified calculation assumes additive volumes; it is not a DCX test or a treatment instruction.

The OCP guide’s operating range for PG25 is 24.5–29.5% glycol by volume. Our example has fallen below it even though the loop is full again. That is a concentration problem; correcting a pH reading would address a different property.[3]

Putting treatment into the circulation system

Continuous monitoring already has a place in the OCP guidance: it says to consider it for critical systems or larger loops, giving more than 250 gallons as an example. It also describes chemical-addition ports for use while the loop keeps running. Adjustments remain tied to the fluid supplier’s analysis and guidance.[3]

DCX packages that activity into the distribution unit itself. Its technical account puts chemical dosing beside flow, temperature and pressure on one controller, and describes support for both PG25 and deionized-water circuits. The useful integration is the connection between a fluid reading, a corrective dose and a record of what changed.[2]

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