John Curran wrote:
> Chilled water to the rack implies multiple CDU's with a
colorful
> hose and valve system within the computer room
(effectively a
> miniature version of the facility chilled water loop).
Trying to
> eliminate potential failure modes in that setup will be
quite the
> adventure, which depending on your availability target
may be
> a non-issue or a great reason to consider moving to new
space.
Actually it wouldn't have to be pressurized at all if you
located a
large tank containing chilled water above and to the side,
with a
no-kink, straight line to the tank. N+1 chiller units could
feed the tank.
Thermo-siphoning would occur (though usually done with a
cold line at
the bottom and a return, warmed line at the top of the
cooling device)
as the warm water rises to the chilled tank and more chilled
water flows
down to the intake.
You would of course have to figure out how to monitor/cut
off/contain
any leaks. Advantage is that cooling would continue up to
the limit of
the BTUs stored in the chilled water tank, even in the
absence of power.
Cordially
Patrick Giagnocavo
patrick zill.net
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