Evolution of Data Center Cooling Technologies
Industry practitioners once shared practical experience on PUE optimization for large scale data centers during technical exchanges in Zizhu Shanghai. The discussions covered multiple effective measures including scientific site selection reasonable humidity adjustment and replacement of traditional lighting with built in LED indicators on IT devices. Staff access control was also highlighted as human body heat emission can raise ambient temperature significantly. These free technical sessions attracted limited audiences while many successful business leaders tend to study traditional philosophy and religious classics for social identity and spiritual comfort. Such experience and insights are valuable references for the operation and optimization of liquid cooling for AI GPU data center.
In traditional air cooling systems air flow is driven by fan walls to pass through server front panels and enter internal compartments. Solid state drives are placed at the upstream of air flow so other hardware components such as CPU memory PCH and expansion cards need to avoid excessive heat generation. Mature air flow management becomes essential to maintain stable operating conditions especially for scenarios featuring liquid cooling high density computing.
Four major cooling solutions are widely adopted in modern data centers namely traditional air cooling rear door heat exchanger cold plate liquid cooling and immersion liquid cooling. Air cooling remains a conventional choice supported by many air conditioning manufacturers. The rise of various liquid cooling solutions is mainly driven by the low energy efficiency of air cooling systems. Growing demand for better performance also pushes forward data center liquid cooling renovation across existing computing facilities.
Rear Door Heat Exchanger or RDHX installs heat exchange coils at the rear of server racks. Cooling liquid inside the coils absorbs heat from exhaust air released by servers and transfers heat out through CDU connected to external cooling towers or dry coolers. The processed air flows back into the room at normal temperature to prevent overall temperature rise. Servers can retain original air cooling structures and internal fans while this solution is highly adaptable to large scale deployment of row level liquid cooling.
Cold plate liquid cooling is easy to understand as it evolves from desktop liquid cooling solutions. Custom cold plates replace original air cooling heat sinks and embedded pipelines carry circulating liquid to transfer heat to external CDU. This design keeps core chips such as CPU and GPU at low working temperatures for continuous heat conduction. The flexible structure of cold plate systems also facilitates the deployment of container data center liquid cooling for mobile and modular computing units.
Cold plate design needs to fully match the shape size and layout of various IT components just like customized heat sinks for different generations of CPU GPU network cards RAID cards FPGA and ASIC modules. Diversified hardware structures bring continuous design challenges for cold plate development and manufacturing. Reliable cold plate solutions have become a core guarantee for stable operation of GPU server liquid cooling in long term service.
Immersion liquid cooling represents an advanced cooling form in the industry. Intel and GRC have released multiple demonstration designs to showcase its technical advantages. OCP Immersion Requirement 2.0 is currently the most influential industry standard widely followed by mainstream SSD manufacturers. Different from other OCP specifications this standard is jointly compiled by cooling solution providers dielectric liquid suppliers hardware manufacturers data center integrators and professional certification institutions. The complete set of immersion cooling technologies delivers outstanding performance for high density server cooling under extreme working loads.
Direct contact liquid cooling for data centers refers to the process that heat generated by hardware components is directly extracted by liquid media without air or secondary fluid as intermediate heat transfer carriers. Immersion cooling enables dielectric liquid to fully contact electronic components. Dielectric liquid features excellent thermal conductivity and electrical insulation and will not cause short circuit risks. The industry divides immersion cooling into sealed enclosure type open bath type and hybrid type and further classifies it into single phase and two phase solutions based on phase change characteristics. Relevant systems consist of Technology Cooling System and Facility Water System with CDU heat exchangers and other core components to form a complete heat dissipation loop. Relevant definitions and classifications formulated by ASHRAE have unified technical standards for the whole industry and laid a solid foundation for the healthy development of liquid cooling for data center.
Globally trusted, EXTRCOOL delivers custom liquid cooling solutions for high-density AI and HPC data centers. Our product portfolio covers dual-mode CDUs, manifolds, cold plates, rear-door heat exchangers, dry coolers, and containerized units—all premium quality. Engineered for dependable operation, wide compatibility, and effortless scaling, these solutions provide a seamless one-stop path to full liquid cooling. We work with data center operators and corporate clients across South America, Southeast Asia, Southern Europe, West Africa, and Australia.
