The Heart of Liquid Cooling, Inside the CDU and Where the Market Is Going
The CDU, short for Coolant Distribution Unit, is the control hub between the primary cold source and the secondary IT equipment, and it does four things: the plate heat exchanger moves GPU and CPU heat to the chilled water while keeping the loops hydraulically isolated; variable frequency pumps drive the closed loop and spread coolant evenly to every rack and cold plate; sensors adjust pump speed and valve opening to hold temperature within ±0.5°C and pressure within ±0.1bar above the dew point; leak detection, filtration and auto refill protect the loop at 0.01 to 0.1 mL/min resolution with N+1 redundancy. The AI server air liquid cooling CDU is the air-to-liquid member of this architecture; the heart pumps, the brain regulates.
A complete CDU is four modules. The heat exchange module, 25% to 30% of value, centers on the brazed plate exchanger in 316L stainless, among the highest barriers in the unit; the power module, 35% to 50%, centers on the pump, centrifugal, maglev or canned, which decides flow, head and capacity with N+1 and a 50,000-hour life target; the control module, 15% to 20%, pairs the PLC or MCU with PID and sensors for coordinated temperature-pressure control, on-demand cooling and AI predictive maintenance; the fluid module, 10% to 15%, covers valves, filters, piping, quick connectors and seals. A modular air liquid cooling CDU carries the same four modules, with air-side rejection replacing the chilled water connection.
Routes divide along three axes. Liquid-to-liquid CDUs use a plate exchanger against chilled water for new data centers; air-to-liquid CDUs reject heat through fans and coils without a water connection for retrofits. Centralized units serve a whole row with high integration; distributed units serve a single rack with short piping and fast response for high density and edge. Cabinet CDUs stand alone at 300kW to 1000kW and above; rack-mounted CDUs fit the server rack at 4U to 6U; wall-mounted units serve small rooms. The high efficiency CDU for data center is chosen along all three axes at once.
The 2026 market shows overseas giants on top and domestic vendors accelerating. Dongwu Securities puts the global CDU market at about $3.6 billion in 2026, $33.4 billion by 2030, a compound rate above 70%; the domestic market passed 9.2 billion yuan in 2025. Envicool leads cold-plate delivery with 30% to 40% share, the only domestic NVIDIA NPN Tier 1 vendor, with capacity above 30,000 units; Shenling holds over 50% of Huawei Ascend CDU supply with 8.6 billion yuan of orders; Sugon Chuang leads immersion at 58% to 65% with 200kW per rack at PUE 1.03; Goaland covers cold plate, immersion and containerized as a ByteDance supplier with dual NVIDIA and Google certification; Tongfei took 38.7% of the domestic integration market serving CATL, BYD and Intel. The data center liquid cooling CDU market is where these five fight.
Vertiv, NVIDIA's top cooling partner and exclusive GB200 supplier, builds the CoolChip at 2.3MW; Schneider holds 18% to 22% after Motivair and leads supercomputing; CoolIT reaches 2MW in the CHx2000 with sub-0.5 ppm annual leaks. The component layer feeds both camps: Alfa Laval, Kelvion and SWEP against domestic Fu'erfa and Airuide; Feilong supplies GB300 CDUs and Dayuan holds over 30% of pumps; Lingyi and Liminda supply NVQD connectors and JONHON leads blind-mate; Chuanhuan builds PTFE-lined piping and Dingtong 316L stainless. For an AI GPU liquid cooling CDU supplier, certification access matters more than capacity.
Six trends shape the road. Power capacity leaps: 2.6MW and 3MW CDUs are already in mass production for GB200 and Rubin clusters with 5MW as the target, and in-rack units iterate from 20 to 40kW toward 60 to 120kW per rack. Integration deepens: the rack mounted liquid cooling CDU folds pump, exchanger and ion tank into one unit, freeing about 70% of cooling room floor space, with parallel power modules for N+1 and hot swap.
The power system is rebuilt: maglev canned pumps replace mechanical ones with 15% to 22% higher efficiency, 30dB less noise, MTBF beyond 400,000 hours and 20% to 100% speed range. AI control adjusts flow and temperature 10 to 30 seconds ahead of load, narrowing chip spread from ±0.8°C to ±0.2°C and cutting pump energy 12% to 18%. Waste heat is recovered: supply-return differential widens to 8 to 12°C with outlet water at 45 to 60°C and up to 75% utilization. For a liquid cooling CDU solution provider, these three lines decide the roadmap.
Safety closes the trends: fiber grating sensing, weir electrodes and branch shutoff valves form triple protection at 0.01 mL/min, water quality stabilizes below 0.3 μS/cm, and cold plate life extends from 3 to 6 to 8 years. The CDU is the heart of liquid cooling, and its reliability decides the whole system; AI demand, the dual-carbon policy and maturing standards have opened the window. The server liquid cooling distribution unit will be won by vendors who hold the high-power, intelligent, modular direction and push domestic substitution.
Reliable liquid cooling deployment relies on standardized piping workmanship, traceable quality records and high-performance components tailored to diverse data centre operational environments. EXTRCOOL delivers integrated liquid cooling platforms with cabinet-type and rack-mounted hardware including CDUs, cold plates, manifolds and piping. The company supports both finished product delivery and personalized structural design for specific site conditions. Systematic configuration brings efficient heat dissipation, reduced energy consumption and lower carbon emissions with practical effectiveness verified in global gigawatt-scale data centre projects. EXTRCOOL provides stable and continuous cooling support for mission-critical business scenarios. Users can browse complete product portfolios and apply for customized quotations at https://www.extrcool.com/.
