http://www.liebert.com/support/whitepapers/documents/050902.asp

COLUMBUS, Ohio -- May 9, 2002 -- Liebert Corporation set a new standard in precision air conditioning with the launch of RackCooler (tm), a revolutionary supplemental cooling system that mounts on most standard rack and server enclosures to provide more than two tons of cooling capacity. The system will remove up to 8 kW (27,300 BTUHs) of heat from each enclosure and requires between 33 to 66 percent less floor space (dependant on heat load densities) of traditional precision cooling equipment.

The RackCooler supplemental cooling system attaches to most standard server cabinets, depending on the facility requirements.

"Racks and enclosures are packed with smaller, faster and more powerful equipment, with one disadvantage -- the tightly packed equipment creates hot spots," said Lennart Stahl, Liebert Corporation product manager. "RackCooler provides a solution to extreme heat conditions by cooling at the source of the heat, and it has a minimal impact on floor space."

RackCooler, used in conjunction with existing precision air conditioning equipment, provides a much more efficient method for cooling densely packed server enclosures. For example, in a data center or communication facility with a load density of 400 watts/ft2 nearly 25 percent of the floor space is occupied by cooling equipment when cooled with standard precision air conditioning. When the RackCooler is employed, only 12 percent of the floor space is occupied by cooling equipment.

The RackCooler provides a system approach to cooling, and utilizes four major components:

1. RackCooler cooling unit that attaches to the door of any standard enclosure
2. Quick-connect hose fittings for easy installation and flexibility to reposition the unit
3. Cooling Distribution Unit (CDU) to assure proper coolant flow, temperature and pressure and isolate the fluid from the main building chiller loop. Tight temperature control, maintained above the dew point, avoids any condensation. (Each CDU can support 12 to 15 RackCoolers.)
4. Fluid Management System constantly monitors for any flow disturbance. If a flow disturbance cause by leakage is detected, the Fluid Management System will immediately drain the fluid in the circulation loop.

"These supplemental cooling systems are designed to add maximum cooling capacity at a minimal cost," said Stahl.

The system is built in stages. In anticipation of future heat loads, all that must be installed is the fluid piping. As cooling requirements increase, RackCooler units are quick-connected into the system. The piping system can be installed overhead, under raised flooring or added to the existing chiller loop.

With limited power requirements, RackCooler is powered from existing 115-volt AC power in the enclosure/rack power strip, and is also available with 230-volt capability. The door mount unit weighs 70 pounds when fully loaded and can be retrofitted by using existing hardware available on most standard server enclosure units. The service access required is no more than 36 inches, standard with most server cabinets.

The CDU maintains all aspects of the supplemental cooling system. For easy monitoring, the CDU is equipped with a 16-character menu-driven display that will interface with building chilled water systems and alarm capabilities. A patented fluid management system is also optional and will immediately evacuate all coolant in the circulation loop if a flow disturbance is detected.

In addition to the tremendous space savings, the supplemental cooling system also has other inherent benefits, such as:

• Dual redundant pumps in the CDU to meet 24x7x365 reliability requirements
• Chilled fluid for added energy efficiency through the use of free cooling
• CDU positioned outside of the critical space to conserve valuable floor space
• Retrofit and build-up options to adapt to ever-changing requirements of data centers and colocation facilities

The RackCooler is one of a family of Liebert 'X-Treme Density' cooling solutions. Additionally, DataCool (tm) is an overhead cooling system (zero floor space required) that provides cooling capacity for environments that have high heat densities.