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As computing systems move toward denser processors, tightly coupled server nodes, and higher-power racks, managing the heat they generate has become a defining challenge in data center design. Modern AI accelerators can dissipate well over 1,000 watts, and a single rack may release more than 100 kilowatts of heat. This is far beyond what air cooling can practically remove. Single-phase direct liquid cooling addresses this by circulating water or a water-glycol coolant through coldplates mounted directly on high-heat components. The coolant absorbs the heat and carries it away in a closed loop to a coolant distribution unit. Because liquid stores far more heat than air and removes it much faster, this approach supports higher chip and rack densities within a smaller footprint. This paper explains how single-phase direct liquid cooling works, how it compares with two-phase and immersion cooling, and how rising processor power and rack density are shaping the future of thermal
