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Designing a Liebert XD Solution

3.5.2 Determining Vertical Placement of Liebert XDOs Above the Cold Aisle

In the maximum density configuration, Liebert recomments placing the XDOs between 18 and 24

inches (457-609mm) above the equipment cabinets. In some cases where the required density is less,

the front-to-rear spacing of XDOs in a row will be increased. To ensure coverage of the wider spaces

between the XDO units, the vertical distance between the cabinets and the XDOs should be increased.

However, the recommended maximum height of the XDO above the cabinets is 30 inches (762mm).

See Figures 12.

Figure 12 XDO spacing—horizontal and vertical

Table 1 Calculating quantity and spacing of XDO modules

Input Information Step Result

Total heat load in the room, kW A

Reserve capacity needed

(10% to 25% of A is recommended)

C Required cooling capacity = A + B

Existing/planned Liebert Deluxe/DS unit sensible capacity D

E Required XD system cooling capacity = C – D

Number of XDOs required = E ÷ 16, rounded up (60Hz)

=E ÷ 14, rounded up (50Hz)

Number of XDP

/XDC modules required = F ÷ 10,

rounded up (60Hz and 50Hz)

Room area, square feet H

I Area served by each XDO = H ÷ F

Spacing of cold aisles, center-to-center, typically 12-16 ft

(3.7 to 4.9m)

K Spacing between each XDO = (I ÷ J) - 2

Required XD system cooling density = E ÷ H

OK if under 640; otherwise, additional cooling is required

from Liebert Deluxe or Liebert DS units.

Front-to-rear spacing of

pairs of XDO modules

XDO height above

equipment to be cooled

Heat-Generating Critical Equipment

Pairs of XDO modules

above critical equipment

Liebert recom-

mends install-

ing one XDO at

the end of each

aisle being

cooled and to

space the

remainder

between these

“end units” in

pairs. This lay-

out will block

the incursion of

hot air around

the side of the

end cabinets.

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