The Power Experts

Liebert DSE​ Free Cooling System, 50-250kW

The Liebert DSE​ Free Cooling System is the industry’s first pumped refrigerant economization system designed specifically for data centers. Ideal for companies seeking sustainable solutions, it provides up to 50% higher efficiency than traditional systems – and it uses no water. Its advanced controls automate economization to get the most free cooling in any environment.

The Liebert DSE is a free cooling economization system with backup DX compressor, that achieves the industry’s highest efficiency operation – up to 50% more efficient than legacy technologies. The Liebert DSE system was recently approved by the State of California as a prescriptive option for economization to be used to comply with Title 24, Part 6.

The DSE system includes several components – a pumped refrigerant economizer, a micro-channel condenser and an indoor CRAC unit. It operates in free cooling or partial free cooling mode, depending upon outdoor temperatures. When criteria for economization are met, the compressors turn off and the refrigerant pump turns on to move the refrigerant through the system to reject the heat of the data center, using only a fraction of the power of a compressor and eliminates the use of water. In contrast, a cooling system with a water economizer uses an average of 4 million gallons of water per year for a data center with an IT load of 1MW.

Additionally, the Liebert DSE system protects against outside air contamination and reduces system wear and tear by eliminating air dampers and louvers. As a self-contained solution, Liebert DSE system is highly scalable. It also offers higher reliability than chilled water systems, because it does not use chillers, pumps, piping and other potential points of failure.

Liebert DSE​ Free Cooling System Specifications

Models Total Nominal Capacity kBtuh[kW] Net Sensible Capacity
kBtuh [kW]
Nominal Airflow [CFM] Height (in) Width (in) Depth (in) Weight (lbs)
DA050, 50kW 170.6 [50.0] 184.2 [54.0] 7000 76 77 35 1590
DA080, 80kW 272.9 [80.0] 287.0 [84.0] 9600 76 100 35 2200
DA085, 85kW 290 [85] 321 [94] 10,400 76 100 35 2250
DA125, 125kW 426.5 [125] 499 [146] 18,000 94 144 47 3465
DA150, 150kW 511.8 [150] 581 [170] 18,000 (24,000 optional) 94 144 47 3574
DA165, 165kW 563 [165] 617.5 [181] 20,000 (24,000 optional) 94 144 47 3574
DA250, 253kW 253 [228] 253 [228]          
For more information about Liebert/Vertiv cooling solutions,
call 800-876-9373 or email .