Emerson Liebert Xtreme Density Spezifikationen PDF herunterladen (Seite 19)

Designing a Liebert XD Solution

3.6 Liebert XDV Unit Placement

XDV units should be placed on top of the cabinets that generate the greatest amount of heat. If heat

loads are dispersed evenly throughout the room, the XDV modules may be spread out accordingly.

The XDV must be placed toward the front of the equipment cabinet, so that its front bottom edge is

flush with the front top edge of the cabinet. Placing the unit farther back on the top of the unit will

restrict airflow into the cold aisle. Placing the unit farther to the front will decrease the amount of hot

air drawn into the unit.

Figure 13 Positioning Liebert XDV on top of cabinet

Both of the XDV’s power cords should be connected to power sources. If only one power source is avail-

able, then only the power cord labeled “SECONDARY” should be connected to the power source.

Piping for the XDV is routed upward to the main return and supply pipes to and from the XDP/XDC.

Table 2 below can be used to determine the correct number of XDV modules.

Table 2 Determine required number of XDV modules

Input Information Step Results

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

sensible capacity

E Required XD system cooling capacity = C – D

Number of XDV modules required = E ÷ 8, rounded up (60Hz)

= E ÷ 6.5, rounded up (50Hz)

Number of XDP/XDC modules required = F ÷ 20, rounded up (60Hz)

= F ÷ 21.5, rounded up (50Hz)

Room area, square feet H

I Area served by each XDV = H ÷ F

Required XD system cooling density = E ÷ H

OK if under 580 for 12-foot cold aisle spacing

OK if under 435 for 16-foot cold aisle spacing

Otherwise, additional Liebert Deluxe or Liebert DS unit capacity is

needed.

INCORRECT

XDV hangs

over front

edge of rack

INCORRECT

XDV is too

far from front

edge of rack

CORRECT

XDV is flush with

front edge of rack

XDV is suspended

from roof structure...

....the separation

between the rack and

the XDV should be

held to less than 1"

(25mm). If this is not

possible, an air

blocker should be

added to prevent

unwanted airflow

between the hot aisle

and the cold aisle.

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