Vertiv Liebert XD Series, System Design Manual

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Input Information Step Results
Total heat load in the room, kW A
Reserve capacity needed
(10% - 25% of A is recommended)
B
C Required cooling capacity, kW = A + B
Existing/planned Liebert Deluxe/DS sensible capacity, kW D
E Required Liebert XD system cooling capacity, kW = C – D
F
Number of Liebert XDV10 modules required = E ÷ 10, rounded up (60Hz)
Number of Liebert XDV10 modules required = E ÷ 8, rounded up (50Hz)
G
Number of Liebert XDP/Liebert XDC units required = F ÷ 16,
rounded up (60Hz and 50Hz)
Room area, square feet H
I Area served by each Liebert XDV10 = H ÷ F
L
Required Liebert XD system cooling density = E x 1000 ÷ 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 capacity is needed.
Table 3.6
Determine required number of Liebert XDV modules (example below is Liebert XDV10)
3.11 Liebert XDP/Liebert XDC Placement
The Liebert XDP/Liebert XDC may be placed in the critical space or in an adjacent equipment room. The
allowable distance between the Liebert XDP/Liebert XDC and its connected cooling modules is
determined by the piping design and by the amount of refrigerant required. Refer to
Liebert XD
Refrigerant on page 55 and Liebert XD Piping System Design on page 38.
The maximum height of any of the main or connecting piping should be no more than 20 feet (6m) above
the top of the Liebert XDP/Liebert XDC unit. Liebert XDV/Liebert XDO modules should be placed as close
to the same level as possible. The differences in elevation between the highest and lowest Liebert XDV or
Liebert XDO module in a system should be no more than 6 feet (2m).
Vertiv | Liebert® Xtreme Density™ System Design Manual | 33