Vertiv Liebert XD Series, System Design Manual

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1 SYSTEM DESCRIPTION
The Liebert XD™ family of cooling units delivers efficient, sensible cooling to high-heat environments.
Liebert XD systems are designed to cool computer racks and hot zones in a data center or computer room
without taking up expensive floor space for cooling components.
The Liebert XD family includes:
•
Liebert XDC
™—Liebert XD Chiller; cools and pumps refrigerant to cooling modules
•
Liebert XDP
™—Liebert XD Pumping unit; pumps refrigerant to cooling modules
•
Liebert XDA
™—mounts on the rear of the equipment cabinet
•
Liebert XDCF
™—Liebert XD CoolFrame; mounts on the rear of an Egenera BladeFrame EX
cabinet
•
Liebert XDH
™—Liebert XD Horizontal row cooler; integrated into hot aisle-cool aisle room
layout
•
Liebert XDO
™—Liebert XD Overhead module; suspended from the ceiling structure
•
Liebert XDR
™—Liebert XD Rear cooling module; mounts on the rear of equipment cabinets
that are 24" (600mm) wide and 42U high, approximately 79" (2000 mm)
•
Liebert XDV
™—Liebert XD Vertical module; mounted on top of the equipment cabinet or
suspended from the ceiling structure
Systems combining Liebert XDO, Liebert XDR and Liebert XDV modules can remove more than 20kW (5.7
tons) of heat per cabinet. A set of Liebert XDCF modules also can remove 20kW (5.7 tons) of heat from an
Egenera BladeFrame EX™ cabinet. A system with Liebert XDH modules can remove more than 30kW
(8.5tons) of heat per rack.
For minimum Liebert XDP and Liebert XDC load recommendations, see Liebert XDP Minimum Load on
page 16; Liebert XDC Minimum Load on page 15; and Table 9.13 on page 193and Table 9.17 on page 197.
The Liebert XD system also performs at high efficiency rates. Properly spaced cooling modules and the
Liebert XD system’s fluid phase change technology, combine to reduce a Liebert XD system’s energy
consumption to at least 27 percent less than a traditional cooling system.
The Liebert XD family maintains this energy efficiency by employing the heat absorption properties of a
liquid (pumped refrigerant) through a phase change. Refrigerant is pumped as a liquid, becomes a gas
within the heat exchangers of the cooling modules (either the Liebert XDCF, Liebert XDH, Liebert XDO,
Liebert XDR or Liebert XDV) and then is returned to either the Liebert XDP or Liebert XDC where it
condenses to a liquid. This eliminates the compression cycle required by traditional systems. And, if a leak
were to occur, the environmentally friendly refrigerant in the data center would escape as a gas, causing
no harm to critical equipment. Because no compressor is used in the pumped refrigerant circuit, no oil is
needed.
Liebert XD cooling modules further increase efficiency with optional control board that reduces fan use
when maximum cooling levels are not required. The control board is available on Liebert XDH, Liebert
XDO and Liebert XDV modules.
1.1 European Union Fluorinated Greenhouse Gas Requirements
Stationary air conditioning, refrigeration, heat pump equipment and stationary fire protection systems in
the European Community market and operating with fluorinated greenhouse gases (f-gas), such as
R407C, R134a, R410A, must comply with the F-Gas Regulation: (EC) No. 842/2006 (F-gas). The regulation
prohibits, among other actions, venting fluorinated greenhouse gases to the atmosphere.
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