Google Brazos: Liquid Cooling for Air-Cooled Data Centers
Quick answer
Google's Brazos brings liquid cooling to air-cooled data centers without facility overhauls. Rack-mounted, 60kW per rack, and open-sourced via OCP.
Google just dropped Brazos, a rack-mounted liquid cooling system that slides into your existing air-cooled data center like a capybara into a cool swamp. No facility-wide plumbing overhaul needed—just plug, play, and keep those 1000W+ chips from melting.
Why Brazos?
Next-gen AI and HPC chips routinely exceed 1000W TDP. Standard air cooling? It’s like trying to cool a caiman with a paper fan. Retrofitting entire facilities with chilled water loops takes months and costs a fortune. Brazos sidesteps that by being a self-contained liquid-to-air cooling unit that fits in a standard rack.
How It Works
Brazos captures heat at the component level using liquid, then dumps it into the hot aisle via high-efficiency heat exchangers. It’s a closed-loop system that keeps the liquid inside the rack, so you get the benefits of liquid cooling without the facility plumbing. Install it one rack at a time—no downtime, no drama.
Key Specs
- Thermal capacity: 60 kW per rack (three units)
- Coolant: Deionized water or 25% propylene glycol
- Power: 40–60V DC, connects to standard rack busbars
- Safety: UL/CSA/IEC 62368-1 certified, leak detection, pressure relief
- Management: Local HMI + Modbus over TCP
Deployment & Open Source
Brazos is generally available now. Google plans to open-source the design through the Open Compute Project, so manufacturers can start cranking these out. It’s a smart move for anyone running high-density gear in legacy facilities—no need to rip out your swamp, just add a Brazos.
For more on cloud infrastructure, check out our Google Cloud review and Cloudflare Workers review.
Original announcement published on Google Cloud.