On Wed, May 22, 2019 at 4:24 AM Chuck Guzis via cctalk < cctalk@classiccmp.org> wrote:
> On 5/22/19 12:49 AM, Christian Corti via cctalk wrote: > > On Tue, 21 May 2019, Patrick Finnegan wrote: > >> Plumbing (unless you're doing aisle containment or RDHx) shouldn't run > >> through the IT space in the data center. > > > > So how exactly do you attach a modern water cooled rack system to your > > cooling water system if not using plumbing? > > So how are data centers cooled with water now? Does the water cool > coldplates directly? > That's an option. I support 20-30kW/rack systems with using Coolcentric (passive) rear door heat exchangers, which have a dewpoint-adjusted cooling loop. The air is generally managed using CRAC units / building air handlers. > I recall visiting the Honeywell plant in Phoenix not long after they > took it over from GE and the engineers there were tinkering with a > direct water-cooling setup--water circulated in each rack (connected by > what was probably vinyl tubing, I don't recall, only that it was > translucent), with copper diaphragms serving as the interface between > the water and the semiconductors. I recall from comments made that > algae was a problem and adding an algicide to the cooling water tended > to corrode the copper diaphragms. > New versions of that are made by companies such as Cool-IT, or HPE's SGI systems. The materials used have progressed quite a bit, mostly eliminating the algae and corrosion problems, and people have mostly settled on ~25-40C (77-104F) water for cooling, to avoid condensing humidity. Pat
