18 Frequently Asked Questions (FAQ)
EN
88
Rittal Liquid Cooling Package
temperature conditions of up to 20 °C "better" than
one installed "above" in an enclosure. Because of
this, in order to achieve sufficient cooling of all sys-
tems in the enclosure when using this sort of cool-
ing, a significantly lower air temperature must be
used. When cooling air is provided from the side,
this problem does not arise. Cooling is more effec-
tive and more exact because the air supplied to the
units can be held within 1-2 °C.
Because the system is built as its own enclosure, the
system is protected against the risk of leaks. All wa-
ter-carrying parts are located outside the actual
server enclosure. Connection to the cooling water
network is made in the floor. Further, Rittal has many
years of experience in the field of air/ water heat ex-
changers. All of this experience is incorporated into
the construction of the Liquid Cooling Package. Be-
cause of these precautionary measures, even in the
very unlikely event of a leak, water cannot find its
way into the area for electronic components. Be-
cause of its "thin" profile of just 300 mm, the pattern
achieved in the data centre is not interrupted. Be-
cause the depth of the enclosures is not increased,
the full width of the walkways in the data centre is
maintained.
How is water connected to the Liquid Cooling
Package?
For easy installation, connection to the building or
recooling system is made, as desired, from below or
from the rear with 1
½
" threaded connections. Of
course, these may be exchanged with quick-re-
lease couplings.
Can both air-cooled and water-cooled server enclo-
sures operate side-by-side in a data centre?
Of course. There must only be a water installation
available for the water-cooled enclosures. The ad-
vantage of this is that the existing room air condition-
ing is not further burdened. Thereby, Liquid Cooling
Package Systems can be used to intercept
"hotspots" in the data centre without requiring the
expansion of the air conditioning system.
Which dimensions are usable for the Liquid Cooling
Package?
The Liquid Cooling Package itself has the dimen-
sions W x H x D 300 x 2000 x 1000/1050/1200 mm.
Every Rittal enclosure with the dimensions H x D
2000 x 1000/1200 mm, independent of width, can
be bayed. Other sizes available on request.
Does the Liquid Cooling Package require mainte-
nance?
The Liquid Cooling Package is maintenance free. All
components are designed with an extremely long
lifespan. In case of a malfunction a message is gen-
erated through the alarm output of the control unit or
through the CMC III PU.
What advantages does a water-cooled solution have
over an air-cooled solution in a data centre?
The use of water-cooled enclosures allows for con-
trolled, efficient and cost-saving cooling of heat
losses, which was not possible with conventional air
conditioning. Thus, it is possible to fully use the
space, which is physically available in the enclo-
sures, instead of being forced to erect half-empty
enclosures because of air conditioning problems.
This achieves considerable savings in the invest-
ment and operating costs of a data centre.
Is a raised floor necessary for installation? If yes, what
height is required?
A raised floor is not required for routing the cooling
water pipes. In principle, the pipes can also be laid
in channels in the floor. A main cooling pipe requires
approx. 150 mm headroom in a raised floor; an en-
closure supply line approx. 50 mm. With high-quali-
ty composite pipes, such as those used in under-
floor heating, an extremely flexible routing of the
cooling water pipelines is possible.
Can LCP-cooled enclosures also be bayed with one
another?
Basically, the Liquid Cooling Package is just a
"small" enclosure. That means that all accessories
for baying may be used. Thus, LCP-cooled systems
may be bayed without limitation.
How is condensate formation prevented in the Liquid
Cooling Package?
Condensation can only occur when air is significant-
ly cooled below the ambient temperature. Thus, its
capacity to absorb or "hold" water is reduced. In the
norm, the Liquid Cooling Package works with water
temperatures above the dewpoint. Condensate for-
mation is thus excluded. If the system is operated
with lower temperatures, the control minimises con-
densate formation. Any arising condensate is effec-
tively hindered from leaving the Liquid Cooling
Package through design measures. These meas-
ures include suitable air routing, wipe-off grids and
condensate management.
How does the Liquid Cooling Package prevent desic-
cation?
At the same time that air is cooled, it is also dehu-
midified. Because of cable entry points, the system
is not 100% sealed off from its surroundings. This
small amount of exchange with external air is suffi-
cient to hold the air`s relative humidity above 30%
and thus non-critical. At no time is there the danger
of static charges arising in the enclosure.
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