Emerson Network Power has released the Liebert DSE, designed specifically for medium to large data centers. The Liebert DSE is a higher efficiency, downflow-only version of the Liebert DS precision cooling system that provides a nominal 125 kW of net sensible cooling. With an energy-efficient SCOP (seasonal coefficient of performance) rating of 2.9, the Liebert DSE is 52 percent more efficient than the ASHRAE 90.1 (2010) minimum requirement of 1.9 for data center cooling units. It also incorporates an optional new-to-the-world “free cooling” technology feature, EconoPhase. At full capacity, it is 114 percent more efficient than an air economizer and mitigates the operational limitations or concerns commonly associated with air economizer technologies.