Data Center Cooling Trends: Liquid Cooling, Immersion & High-Density Solutions

Your Cooling Infrastructure Was Designed for 5kW Per Rack. Your AI Workloads Are Pushing 15kW+. What Now?

By Molly Gross, Principal, Power Solutions, LLC

Rising rack densities driven by AI, Big Data, and edge computing are outpacing traditional air cooling. Here is what’s replacing it — and what small to medium data centers can do today.

Rack densities are rising rapidly as AI, IoT, Big Data, and edge computing demand more processing power in the same or smaller footprint. Traditional air cooling — already stretched thin in many facilities — cannot keep pace with densities exceeding 10kW per rack. This whitepaper explains the cooling technologies that are replacing it: liquid cooling (direct to chip and immersion), hot-aisle/cold-aisle containment, self-cooling racks, and retrofit solutions for edge computing centers and network closets. This whitepaper is a practical guide for data center managers evaluating cooling upgrades without a full build-out. Power Solutions is a vendor-neutral supplier of cooling equipment from Schneider Electric, Vertiv/Liebert, Motivair, and others.

Whitepaper Summary

Q: What is driving the increase in data center rack density?

A: AI workloads, IoT, edge computing, and Big Data are requiring dramatically more computing power per rack. Industry data shows 45% of companies expect average densities of 11kW per rack or higher — up from an average of 5kW.

Q: What is liquid cooling and when is it the right choice for a data center?

A: Liquid cooling includes direct-to-chip and immersion cooling methods. It becomes cost-effective when rack densities exceed the capacity of air cooling — typically around 15–20kW per rack and above.

Q: What is the difference between direct-to-chip and immersion cooling?

A: Direct-to-chip cooling delivers liquid coolant directly to processors via cold plates attached to the chip, while leaving other components air-cooled. Immersion cooling submerges IT components entirely in non-conductive liquid, providing higher efficiency.

Q: What cooling options are available for small edge data centers and network closets?

A: Retrofit options include self-cooling rack enclosures (like Eaton self-cooling racks), precision cooling units, and modular micro data centers with integrated cooling designed for limited space and non-traditional environments.

Q: What is hot-aisle/cold-aisle containment and how does it improve cooling efficiency?

A: Aisle containment separates hot air exhaust from cold air supply, preventing mixing and allowing cooling systems to work more efficiently. It can significantly reduce cooling energy costs in existing data centers without major infrastructure changes.

Download this whitepaper.