Emerson CoolFrame ユーザーズマニュアル

Adding targeted supplemental

cooling is much more cost-

efficient than trying to lower the

temperature of localized hot spots

by increasing the overall room air

conditioning capacity. Liebert 

X-treme Density mission-critical

cooling systems are specifically

designed to address the higher

heat loads generated by tightly

packed electronic rack enclosures.

Individual systems can cool hot air

ejected from the enclosure or cool

hot spots or zones near the racks.

The Liebert XD Solution 

— Pumping Unit

When a building chilled water

system is available, the Liebert XDP

Pumping Unit serves as an

intermediary to isolate the building

chilled water circuit from the XD

Coolant circuit. It circulates coolant

to the Liebert XD CoolFrame at a

temperature always above the dew

point to prevent condensation.

—A Coolant Chiller

The Liebert XDC Coolant Chiller is a

specially designed indoor unit that

connects directly to the Liebert XD

CoolFrame modules and provides

XD Coolant circulation and control.

It ensures that the coolant is

constantly above the dew point in

the room, eliminating concern for

condensation. Available with several

heat rejection options. 

—This unique application of an off-the-

shelf product makes the Liebert XD solution very energy efficient. The XD

Coolant operates at low pressure and becomes a gas at room

temperatures, making it ideal for use around electronic equipment. 

There are two reasons the Liebert XD system uses a waterless refrigerant.

First, many data center managers are reluctant to re-introduce water into

their facilities because of the possibility of equipment damage from

leakage. Secondly, the refrigerant used in the Liebert XD system is more

efficient than water and has advantages in system design and reducing

energy costs associated with cooling.

Chiller

Liebert XDP
Pumping Unit