Emerson Liebert Xtreme Density Spezifikationen PDF herunterladen (Seite 16)

Designing a Liebert XD Solution

3.0 DESIGNING A LIEBERT XD SOLUTION

Liebert XD systems are intended for use with precision air conditioning equipment, such as the Lie-

bert Deluxe System/3 and Liebert DS. The precision air conditioning equipment is required to control

the room’s humidity and to filter the air.

The XD systems provide efficient, highly effective heat removal (sensible cooling only), and provide no

dehumidification. The XD control system maintains the coolant temperatures just above the dew

point of the space to prevent condensation. Since the capacity of the system is limited by the dew

point in the space, sufficient dehumidification and an adequate vapor barrier must be provided to

maintain the dew point at or below the level necessary to achieve the required capacity.

In their maximum density configurations, the XDO/XDV system can provide more than 16kW of cool-

ing capacity per rack.

The Liebert XD system is optimized for hot aisle/cold aisle equipment configurations, the industry’s

most highly recommended method for dealing with extremely high heat loads.

Refer to the technical data manual of either the Deluxe System/3 (SL-18100) or the Liebert DS (SL-

18810) for additional installation and application guidelines that apply to all critical space cooling

applications.

3.1 Determine Cooling Requirements and Select Liebert XD System

1. Calculate the total cooling required

2. Determine placement of the XD units

3. Determine required pipe sizes

4. Calculate the coolant volume of the XD systems

5. Complete design details including, electrical, mounting, piping, etc.

3.2 Calculate the Heat Load to be Handled by Liebert XD System

When designing a cooling solution using the XD system, the initial steps are similar to those required

to cool a conventional critical space. The total heat load must be calculated, including sensible and

latent cooling requirements. These should be increased by the reserve capacity needed for pull-down

situations where the room temperature must be reduced and to provide for unexpected increases in

heat load.

The next step is to determine how much of the required cooling capacity is to be provided by Liebert

Deluxe or Liebert DS units. If the facility is new, typically up to 150 watts per square foot (1500 watts

per m

) of cooling can be obtained from Liebert precision air conditioning units supplying air through

a raised floor. In existing facilities, such factors as raised floor height, under-floor obstructions or

other limitations may reduce this to less than 50 watts per square foot (500 watts per m

Once the total required sensible cooling capacity is known, subtract the sensible cooling portion to be

provided by Liebert Deluxe or Liebert DS units. This yields the cooling capacity to be provided by the

XD system.

NOTE

Reserve capacity is distinct from redundant capacity in that redundant capacity may or may

not be available concurrently with normal operating capacity. Reserve capacity is available

concurrently with normal operating capacity.

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Emerson Liebert Xtreme Density Spezifikationen Seite 16