Data Center

Coolant Distribution (CDU)

Coolant distribution is the hydraulic interface between the facility water loop of a data centre and the technology loop inside the rack. A coolant distribution unit keeps both loops physically separate, holds the secondary supply temperature above the dew point of the rack environment, matches flow rate to the heat the servers actually release and keeps system pressure inside the window the cold plates allow. Heat exchanger, circulation pump, pressure maintenance, filtration and instrumentation for temperature, pressure and conductivity all belong to this assembly. Direct-to-chip cooling cannot be run safely without it.

This section currently lists no articles. The branch is structured by function in the cooling loop first, and the range is being built up: distribution units, water-to-water heat exchangers, pump groups, pressure maintenance and spare parts. Until stock arrives, the subcategories set out what each assembly does in the loop and which materials survive in the water-glycol mixture of an IT loop. Requests for specific assemblies are handled as project business.

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Buying guide

How to choose Coolant Distribution (CDU)

What matters when choosing: properties, comparison and typical applications.

What coolant distribution does

⚡ Loop separation - secondary water and facility water stay physically apart, so dirt and hardness do not reach the cold plate

↕ Dew point control - supply temperature is held above the dew point in the rack, so no condensate forms on hoses and manifolds

⚙ Flow follows load - pump and control valve track the released heat instead of a fixed set point

◆ Pressure maintenance - membrane vessel and make-up hold pressure within the range the cold plate seals accept

✓ Material rule of this branch - stainless steel, PP, PE, PVDF, PTFE, POM and PVC are unrestricted, brass, gunmetal, bronze and copper only in single-metal pairings, galvanised steel and aluminium not at all

◎ Range under construction - the subcategories exist and describe the function, articles follow as series are released

Assemblies of the cooling loop compared

Which assembly performs which task in the secondary loop

Assembly	Task in the loop	Selection criterion	Material note
Coolant distribution unit	separates primary and secondary loop, controls temperature and flow	heat load, temperature spread, pump redundancy	wetted parts in stainless steel and plastics
Water-to-water heat exchanger	transfers heat between the loops	approach temperature, pressure drop, cleanability	stainless steel plates, check the brazing material
Circulation pump and pump group	generates the flow rate in the secondary loop	head at the duty point, control mode, redundancy	housing in stainless steel or plastics
Expansion vessel and pressure maintenance	absorbs volume change and holds system pressure	system volume, temperature swing, static height	membrane resistant to water-glycol
Spare and wear parts	replace seals, filters and sensors	device series, sealing material	EPDM and PTFE are common in glycol loops

Typical applications

Direct-to-chip cooling of AI and HPC racks with cold plates
Rear door heat exchangers on existing server cabinets
Retrofitting air cooled floor space with individual liquid cooled islands
Colocation sites where facility loop and customer loop are owned separately
Test benches and laboratory loops with a defined supply temperature
Secondary loops for power electronics and power supplies inside the rack