22 May
2019
22 May
'19
8:30 a.m.
On Wed, May 22, 2019 at 4:24 AM Chuck Guzis via cctalk <
cctalk at classiccmp.org> wrote:
On 5/22/19 12:49 AM, Christian Corti via cctalk
wrote:
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.
On Tue, 21 May 2019, Patrick Finnegan wrote:
So how are data centers cooled with water now? Does the water cool
coldplates directly?
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? 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