2 GENERAL PRODUCT INFORMATION
2.1 Product/System Description
The Liebert DCD is an air-water heat exchanger that is integrated into the rear door of a server rack. The
Liebert DCD meets the requirements of the EN 60950 standard. The design allows installation on the
back of a server cabinet while maintaining access to the back of the servers while the chilled water
connections remain stationary. The heat exchanger is suitable for absorbing up to 35kW heat loads from
server racks 24" (600mm) x 42U. It can be configured so that no heat is released in the installation area.
Heat produced by internal components (e.g., servers), is reliably removed by the door with a built-in
chilled water system or a chilled water distribution unit, such as the Liebert DCP™ (see Figure 2.1 below).
A chilled water distribution unit provides these benefits:
• Isolates the building’s chilled water circuit from the chilled water circuit in the data center. The
Liebert DCP circulates chilled water to Liebert DCD while preventing condensation by
maintaining the water temperature above the room dew point.
• Ensures the proper flow rate to the Liebert DCD. This is critical to achieve and maintaining the
needed capacity.
• Minimizes the possibility of a leak within the data center by separating the data center from
the building chilled water circuit. Should a leak occur within the data center, the volume of
water is limited to the amount in the secondary piping system instead of the amount in the
entire building chilled water system.
Figure 2.1 Generic piping layout
Room air is drawn in through the front of the rack and picks up heat from the servers. Cooling occurs
when the server exhaust air passes through the Liebert DCD’s heat exchanger (see Figure 2.2 on the
next page). The air is moved through the heat exchanger by the server fans.
The Liebert DCD is not expected to produce any condensation because of its location within the
conditioned space and if connected to a Liebert DCP or if the chilled water temperature is maintained
above the dew point. A condensate pan is provided as a precaution. It has a drain fitting to allow any
condensate to be emptied.
Vertiv | Liebert® DCD™ User Manual | 7
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