jcurran@mail.com (John Curran) writes:
While the chilled water door will provide higher equipment density per rack, it relies on water piping back to a "Cooling Distribution Unit" (CDU) which is in the corner sitting by your CRAC/CRAH units.
it just has to sit near the chilled water that moves the heat to the roof. that usually means CRAC-adjacency but other arrangements are possible.
I know that it would have to be quite a bit before many folks would: 1) introduce another cooling system (with all the necessary redundancy), and 2) put pressurized water in the immediate vicinity of any computer equipment.
the pressure differential between the pipe and atmospheric isn't that much. nowhere near steam or hydraulic pressures. if it gave me ~1500w/SF in a dense urban neighborhood i'd want to learn more. -- Paul Vixie