Emerson Liebert Xtreme Density Specifications download pdf (Page 17)

Designing a Liebert XD Solution

3.3 Selecting Liebert XDO or Liebert XDV Modules

The next step is to select XDO or XDV cooling modules to be configured into the solution. An XDO and

an XDV can be connected to the same XDP/XDC piping circuit.

Generally, the XDO is selected for use in new installations or renovations where the unit can be

installed on the ceiling or in the overhead space.

The XDV is designed to permit mounting directly on top of an equipment cabinet, for ease of installa-

tion in existing facilities. The XDV may also be suspended from overhead, using suitable mounting

methods.

3.4 Airflow Requirements for Liebert XD Solutions

Computer manufacturers typically specify a temperature change from intake to exhaust (delta T) of

18-27°F (10-15°C) for the air passing through a rack enclosure. The heat generated by electronic

equipment combined with the tight quarters of equipment cabinets mean that high volumes of air

must move through an enclosure to meet this cooling specification.

An XD system can supply the cooled air to satisfy this cooling demand, but airflow through the enclo-

sure must be adequate to extract the heat from the cabinet. Liebert’s XDA units can boost the airflow

to levels necessary to protect critical equipment. It is particularly suited to the hot aisle/cold aisle

arrangement.

3.5 Liebert XDO Placement

3.5.1 Determining Spacing of XDOs in an Aisle

XDO units should be placed in rows directly above the cold aisles of a room for optimum cooling. Each

XDO serves an area equal in width to the cold aisle spacing (typically 12 to 16 feet [3.7 to 4.9m]). The

length of the area served includes any space between XDO modules in a row. Depending on the cool-

ing capacity to be achieved, spacing between XDO modules in a row can vary from zero to as much as

6 feet (1.8m). When the spacing increases to more than 6 feet (1.8m), overall performance of the sys-

tem may be negatively affected and gaps in cooling may occur.

Liebert recommends installing one XDO at the end of each aisle being cooled and to space the remain-

der between these “end units” in pairs as shown in Figure 12. This layout will block the incursion of

hot air around the side of the end cabinets.

Figure 11 XDO placement over cold aisle

Table 1 can be used to determine the correct number and spacing of XDOs.

HOT AISLE

Cold Aisle

Spacing

Hot air is

drawn into

the XDO for

cooling

XDOXDO

Critical

Equipment

Critical

Equipment

Critical

Equipment

Critical

Equipment

COLD AISLE

Hot air goes

into the hot

aisle

Cooled air

enters the

rack...

Hot air goes

into the hot

aisle

Cooled air

enters the

rack...

COLD AISLE

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 51 52

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Emerson Liebert Xtreme Density Specifications Page 17

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