# Single-Phase Direct Liquid Cooling Is Proven for the Next Decade of Ultra-Dense Compute

> Source: <https://content.knowledgehub.wiley.com/single-phase-direct-liquid-cooling-is-proven-for-the-next-decade-of-ultra-dense-compute/>
> Published: 2026-09-16 13:24:18+00:00

## Download this complimentary White Paper today!

This White Paper provides a comprehensive overview of how single-phase direct liquid cooling manages the rising thermal demands of AI and high-performance computing, and how it compares with two-phase and immersion approaches.

**What you will learn about:**

- Why rising compute density has made heat the central design constraint in AI and high-performance computing, where individual processors now exceed 1,000 watts and racks dissipate more than 100 kilowatts.
- How semiconductors respond to excess heat through thermal throttling, and why maintaining thermal margin supports higher performance and longer hardware life.
- Why air cooling reaches its practical limit at high rack densities, and how liquid absorbs and carries away far more heat in a closed loop.
- How single-phase direct liquid cooling works at the chip and system levels, and how it compares with two-phase and immersion cooling.
- How processor power and rack density are expected to grow, and what these trends mean for the future of thermal design.

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# *Presented by IEEE Spectrum* and Wiley, sponsored by CoolIT Systems

## More Information

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