Rear Door Heat Exchanger and CDU Liquid Cooling Application Analysis
Driven by booming AI advancement, high-performance servers see rapidly growing deployment demands. Limited by site condition, capital budget and construction cycle, new infrastructure construction can hardly satisfy all computing requirements. It gives rise to massive upgrade demands for existing computer rooms, making data center liquid cooling solution a practical way to tackle heat dissipation challenges brought by high-density power servers.
Rear Door Heat Exchanger serves as a cabinet-mounted air-liquid heat exchanger. Firmly installed at server cabinet rear, it integrates high-density fin heat exchangers and liquid cooling channels. Hot exhaust air from servers conducts efficient heat exchange with circulating coolant inside the unit. The device captures 80% to 100% cabinet heat load and balances internal temperature, working compatibly with mature cold plate liquid cooling systems to achieve effective rack heat neutralization.
Requiring no large-scale infrastructure reconstruction, RDHx greatly improves rack power bearing capacity and cuts overall air conditioning consumption. It acts as a pivotal upgrade option for traditional air-cooled rooms adapting to high-density operation, perfectly catering to practical demands of AI data center cooling.
Distinct gaps exist between RDHx and conventional computer room air conditioners in heat dissipation logic, energy consumption and applicable scenarios. RDHx realizes near-source heat interception with 40% to 70% higher heat removal efficiency. It optimizes pPUE to 1.05-1.15 and supports rack load up to 100kW. Featuring modular quick installation and reliable multi-layer leakage protection, the product fits diverse deployment modes including row level liquid cooling.
RDHx is widely applied in multiple mainstream scenarios. It supports GPU cluster operation of small AI computing centers, facilitates density upgrade of outdated data centers, adapts to narrow-space edge computing stations, and meets computing demands of laboratories and leased server rooms. Its compact and flexible layout also satisfies deployment needs of container data center liquid cooling.
Rack-mounted air-liquid CDU builds a closed secondary cooling loop inside cabinets. It absorbs heat from server chips and dissipates heat via internal heat exchangers. Realizing seamless compatibility between liquid-cooled servers and original air-cooled facilities, it lowers reconstruction investment by 30% to 50% and delivers stable and economical heat management for liquid cooling for AI GPU data center.
As the core equipment of liquid-to-liquid cooling architecture, rack-mounted liquid-liquid CDU achieves efficient heat isolation and exchange. Capable of bearing rack load from 80kW to 120kW, it supports ultra-high power AI training clusters with heat exchange efficiency over 95%. With excellent expandability and energy-saving performance, it provides solid guarantee for stable liquid cooling high density computing.
To sum up, RDHx maximizes heat dissipation potential of air cooling systems. Air-liquid CDU works as flexible transitional equipment, while liquid-liquid CDU represents the ultimate cooling form for future computing power. With over half of AI servers adopting liquid cooling by 2026, diversified products will jointly drive steady and efficient data center liquid cooling renovation across the whole industry.
As a world-class authority in liquid cooling, EXTRCOOL designs fully customized solutions specifically for high-density AI and HPC data centers. Our complete portfolio of premium thermal management hardware includes dual-mode CDUs, various manifold assemblies, cold plates, rear-door heat exchangers, dry coolers, and integrated containerized cooling units. These field-proven systems deliver stable performance, broad interoperability, and straightforward scalability—enabling a seamless, one-stop full liquid cooling deployment. With deep professional expertise, we support data center operators and enterprise clients across Eastern Europe, the Middle East, South Asia, Central Africa, North America, and other strategic global markets.
