A Product Brief from the Experts in Business-Critical Continuity™ Liebert® DSE™ with EconoPhase™: Highest Efficiency DX Cooling with pumped refrigerant economizer
Introducing the Liebert® DSE™ from Emerson Network Power In today’s data center, minimizing annual energy usage while maintaining reliability is increasingly important. While chilled-water loops operating at elevated temperatures supported by water-side economizers have helped to decrease energy usage, new innovations are changing how the data center industry thinks about direct expansion (DX) cooling infrastructures with respect to efficiency, scalability and reliability.
Indoor CRAC Unit Designed with State-of-the-art Technologies The Liebert® DSE™ indoor unit (DA080, DA085, DA125 or DA150) is equipped with several high-technology components that are designed and controlled to work together to provide a highly efficient and reliable DX system.
The Liebert® MC™ condenser offers other benefits beyond the intrinsic efficiency gains.The micro-channel coil design eliminates the need for copper/aluminum junctions, improving the condenser’s resistance to corrosion and extending the life of key internal components. And the condenser’s optimized fan blade design significantly reduces fan noise at full load - lower operating speeds can result in even lower sound levels.
by automatically transferring between mechanical cooling and economizer operation modes. Built-in diagnostics ensure that system reliability is maintained, and information about system operation is reported.
The Liebert® DSE™ system combines DX mode operation during warmer temperatures and refrigerant economizer mode during cooler temperatures, resulting in a mechanical power usage effectiveness (PUE) between 1.05 and 1.3. between mechanical cooling and economizer cooling several times during the year.
Optimizing Cooling System Operating Modes to Ambient Conditions The operation of the Liebert DSE and corresponding Liebert EconoPhase™ system is adaptable based on the ambient seasonal temperatures and the overall IT load of the data center. The following examples model a data center operating at 88 kW of load on the system (70 percent load when using a 125kW, DA125 model).
Figure 4: Cold-Weather Operation: Pumped Refrigerant Economization with Compressor Bypass Liebert EconoPhase Check Valve 0.6kW 3.9kW Liebert 0.6kW SolenoidValve MC Condenser Refrigerant Pump PUE as low as 1.05 Full economizer mode Check Valve Electronic Expansion Valves 3.
80% Load (100kW), 85°F return air Mixed mode and Liebert EconoPhase Efficiency 25 20 Mixed Mode Full Economization 15 +600% 10 Traditional DX Cooling 5 0 0 10 20 30 40 50 60 70 Outdoor Temperature F° Figure 5: Liebert® EconoPhase™ efficiency progression according to outdoor ambient temperature (operating at 80 percent load).
return air temperatures of 85°F, 100 percent economization is achieved at an outdoor ambient temperature of 50°F. Increasing the return air to 105°F at 70 percent operating load results in 100 percent economization at just over 70°F outdoor ambient temperature, enabling even more economizer hours. The key takeaway is that, in order to maximize economization, three factors must be optimized: return air temperature, operating load and outdoor ambient temperatures.
Regardless of the system used, an intelligent control system that evaluates room load, room temperature (or supply air temperature) and outdoor temperature must be employed to determine the most optimal operation of system. When considering total cost of ownership, the Liebert® DSE™ with Liebert EconoPhase™ system also compares very favorably to alternative cooling systems. In order to compare systems, a complete picture of system costs must be known and compared.
Emerson Network Power Liebert Corporation World Headquarters 1050 Dearborn Drive P.O. Box 29186 Columbus, Ohio 43229 United States Of America 800 877 9222 Phone (U.S. & Canada Only) 614 888 0246 Phone (Outside U.S.) 614 841 6022 FAX Contact@EmersonNetworkPower.com Emerson Network Power Caribbean and Latin America Office – United States of America +1-954-984-3452 Phone Ask.Cala@Emerson.com liebert.com 24 x 7 Tech Support 800 222 5877 Phone 614 841 6755 (outside U.S.) Emerson Network Power.
