The Liebert
®
MC™ condenser offers other benets beyond
the intrinsic efciency gains.The micro-channel coil design
eliminates the need for copper/aluminum junctions,
improving the condenser’s resistance to corrosion and
extending the life of key internal components. And the
condenser’s optimized fan blade design signicantly
reduces fan noise at full load - lower operating speeds can
result in even lower sound levels.
Hassle-free Economization with
Liebert EconoPhase™ Pumped
Refrigerant Economizer
In addition to the aforementioned components, the
integrated Liebert EconoPhase pumped refrigerant
economizer – the industry’s rst – is a key component to
maximizing the Liebert DSE™ system’s efciency during
lower outdoor ambient conditions. The Liebert EconoPhase
economizer is unique from other systems particularly
because it is designed to operate without consuming
water, eliminating the need for expensive water treatment
systems and removing the risk of water leaks by not
introducing water into the data center environment. The
Liebert EconoPhase also eliminates the risk of outside
air contamination and does not require maintenance
associated with air-economizers such as damper and
louver maintenance.
Changeover between compressor mode and refrigerant
economizer mode is almost instantaneous, whereas
traditional economizer systems typically operate in
economizer mode only when the economizer season is
stable—not changing back-and-forth during the night, for
example. The Liebert EconoPhase solution is equipped
with variable speed pumps controlled to run at the most
efcient levels according to heat loads and ambient
outdoor temperatures, providing maximum economization
with minimum pump power consumption.
The Liebert EconoPhase is also unique in that it is designed
with reliability in mind. The Liebert iCOM™ control
monitors pump operation to ensure that the pumps do
not cavitate - improving system reliability and service life.
If free-cooling mode is temporarily disrupted, reliability
is maintained by switching to DX operation without
interruption. If a Liebert EconoPhase pump needs to be
serviced, it can be isolated from the system and replaced
without loss of mechanical cooling.
Fin/Tube Liebert MC +/-
Efficiency (COP) 31 47 +52%
Sound Power (dBA) 77.3 73 -4.3 dBA
Refrigerant Charge (lb) 22 6 -73%
Footprint (ft2) 39.8 33.6 -15%
Weight (lb) 670 400 -40%
Figure 1: Breakdown of typical benets offered by the Liebert MC’s micro-channel condenser design, compared to a traditional
n/tube design found in most DX cooling systems.
4
(24 pages)
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