Emerson Xtreme Density manual Liebert XDV Unit Placement, Input Information Step Results

Designing a Liebert XD Solution

3.7Liebert XDV Unit Placement

Liebert 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 Liebert XDV modules may be spread out accordingly.

The Liebert 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 16 Positioning Liebert XDV on top of cabinet

Liebert XDV is suspended

from ceiling structure...

....the separation between the rack and the Liebert 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.

CORRECT

Liebert XDV is flush with

front edge of rack

X X

INCORRECT	INCORRECT
Liebert XDV is	Liebert XDV
too far from front	hangs over front
edge of rack	edge of rack

Both of the Liebert XDV’s power cords should be connected to power sources. If only one power source is available, then only the power cord labeled “SECONDARY” should be connected to the power source.

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

Table 4, below, may be used to determine the correct number of Liebert XDV modules.

Table 4 Determine required number of Liebert XDV modules (example below is Liebert XDV10)

Input Information	Step	Results
Total heat load in the room, kW	A
Reserve capacity needed
(10% to 25% of A is	B
recommended)
	C	Required cooling capacity, kW = A + B
Existing/planned Liebert	D
Deluxe/DS sensible capacity, kW
	E	Required Liebert XD system cooling capacity, kW = C – D
	F	Number of Liebert XDV10 modules required = E ÷ 10, rounded up (60Hz)
		= E ÷ 8, rounded up (50Hz)
	G	Number of Liebert XDP/Liebert XDC modules required = F ÷ 16, rounded
		up (60Hz and 50Hz)
Room area, square feet	H
	I	Area served by each Liebert XDV10 = H ÷ F
		Required Liebert XD system cooling density = E x 1000 ÷ H
		OK if under 580 for 12-foot cold aisle spacing
	L	OK if under 435 for 16-foot cold aisle spacing
		Otherwise, additional Liebert Deluxe or Liebert DS unit capacity is
		needed.

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