Structural Classification & Working Principle of Cold Plate Liquid Cooling CDU for Data Centers
A complete cold plate liquid cooling solution for data center servers consists of outdoor cold source, primary loop, CDU (Coolant Distribution Unit), secondary loop and liquid cooling racks. The primary loop carries heat away from CDU to outdoor equipment via cooling water, while the secondary loop transfers rack heat to CDU with coolant. Heat exchange between primary and secondary fluids takes place inside the heat exchanger of CDU, forming a closed and stable heat circulation loop supported by the reliable liquid distribution unit CDU.
CDUs come in diverse structural forms with multiple classification standards. By installation layout, they are divided into centralized cabinet-mounted CDU and distributed rack-mounted CDU; by heat exchange mode, liquid-to-liquid CDU and air-to-liquid CDU are mainstream models; in terms of internal pressure bearing design, positive pressure CDU and negative pressure CDU are available to match different project requirements. As core hardware of the whole thermal control system, the mature efficient liquid CDU cooling system covers all above types to satisfy differentiated data center construction demands.
Centralized CDU is placed side by side with liquid cooling racks, delivering cooling capacity to all connected racks through prefabricated secondary ring pipelines. It fits large and super-large data centers with fixed operation scales and brings convenient daily maintenance experience for operation teams.
Distributed CDU is integrated inside each liquid cooling rack and connected to the primary cooling ring network through branch pipes. It adapts to phased server deployment and racks with varying power density, featuring flexible installation and simplified secondary pipeline layout. Professional engineers from a trusted liquid cooling CDU supplier will propose centralized or distributed layout schemes according to actual project conditions.
As the core equipment of cold plate liquid cooling technology, a standard CDU is assembled with heat exchanger, circulation pump, constant pressure liquid replenishment system, multi-type sensors, fluid pipelines and supporting valves. Coolit Systems and nVent jointly launched a rack-mounted liquid-to-liquid CDU as a typical reference model to display complete operating logic and standardized technical specifications, fully showcasing the manufacturing capacity of a professional liquid cooling CDU factory China.
This 4U rack-mounted liquid-to-liquid CDU supports ultra-high heat dissipation load with stable performance. It adopts dual redundant centrifugal pumps and dual power supply for backup operation, equipped with an integrated monitoring control system with 4.3-inch display screen. Leak detection sensors and dedicated leak trays are arranged on both primary and secondary loops to eliminate hidden liquid leakage risks. The built-in liquid cooling CDU coolant tank contains level monitoring sensors and 100-micron filters, which can accommodate coolant thermal expansion, with drain outlets and dew point control functions reserved for stable long-term circulation.
The primary loop complies with ASHRAE W4 temperature standards with flexible inlet temperature range. It is equipped with flow, pressure and temperature sensors together with flow control valves, connected via 1.5-inch sanitary clamp joints. The secondary loop uses PG25 coolant with independent monitoring and adjustment components, all customized and produced by a reliable custom liquid cooling CDU manufacturer.
Strict performance indicators guarantee stable round-the-clock operation of the equipment. The unit boasts long mean time between failures and supports alternating pump operation to extend service life. Pressure protection valves and bypass valves are set on primary and secondary loops for safe pressure relief, while low-noise structural design keeps running sound within a low decibel range. The wide universal voltage input design can adapt to power supply standards of global data center sites.
The heat exchange capacity of CDU is closely correlated with approach temperature difference under fixed secondary flow and dual-pump simultaneous operation mode. As a professional data center CDU, this device achieves precise matching of cooling output according to actual temperature difference changes, maximizing heat exchange efficiency. All structural and functional designs comply with the design logic of standard coolant distribution unit for liquid cooling, providing standardized and customizable liquid cooling solutions for AI computing hubs, large IDC parks and edge data center projects worldwide.
EXTRCOOL custom-builds liquid cooling systems for AI and HPC data centers, offering a full suite of CDUs, manifolds, cold plates, rear-door heat exchangers, dry coolers, and containerized units. Engineered for reliability, easy integration, and scalable growth, these solutions deliver a complete cooling package to clients across East Asia, South Asia, Western Europe, North Africa, and Latin America.
