Example
For example, a 2000 ft2 server room with has 30 racks, 15 racks produce 20kW of heat each and 15
produce 10kW of heat per rack.
1. Calculate the total sensible cooling load.
15 racks x 20kW/rack = 300kW
15 racks x 10kW/rack = 150kW
300kW + 150kW = 450kW
The total room load is 450kW.
2. Check heat density per square foot:
450kW/2000ft
2
= 0.225kW/ft
2
= 225W/ft
2
3. Determine base cooling requirements:
Typically, perimeter cooling accounts for 2 to 5kW per rack.
2kW x 30 racks = 60kW
Based on 2kW/rack, 60 kW will be handled by the perimeter cooling.
4. Determine Liebert XD cooling requirements:
450kW - 60kW = 390kW
Three Liebert XDP160s would be needed.
5. Calculate the Liebert XDP reserve capacity:
390kW/3 Liebert XDP160s = 130kW
Each Liebert XDP, on average, would bear 130kW of the heat load.
130kW / 160kW = 81% of maximum load
This Liebert XD solution has 19% reserve capacity.
3.3 Selecting Liebert XD Cooling Modules
The next step is to select the Liebert XD cooling modules to be configured into the solution. Liebert XD
modules that use pumped refrigerant can be connected to the same Liebert XDP/Liebert XDC piping
circuit. This includes the Liebert XDCF, Liebert XDH, Liebert XDO, Liebert XDR and Liebert XDV.
Generally, the Liebert XDO is selected for use in new installations or renovations where the module can be
installed on the ceiling or in the overhead space.
The Liebert XDV is designed to permit mounting directly on top of an equipment cabinet, for ease of
installation in existing facilities. The Liebert XDV may also be suspended from overhead, using suitable
mounting methods.
The Liebert XDCF is a self-contained module designed to cool Egenera’s BladeFrame EX cabinets and
equipment without exhausting heat into the room. Two modules may be mounted on the rear of a
BladeFrame cabinet.
The Liebert XDH is installed among equipment cabinets and is particularly suited for new installations.
The Liebert XDR replaces the rear door of an equipment cabinet.
Vertiv
| Liebert® Xtreme Density™ System Design Manual |
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Summary of Contents for Liebert XD Series
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