Energy Performance Comparison of Fixed Speed, Danfoss VSH 088, and Mechanically Modulated Compressors When Cooling and Dehumidifying 100% Outdoor Air to 55 F for 8760 Hours per Year in 8 US Cities. Prepared May 4, 2011 S. A. Mumma, Ph.D., P.E. Executive Summary: VSH 088 vs. Mechanically Modulated annual energy consumption Energy consumption necessary to cool and dehumidify 100% outdoor air (OA) to 55 F was modeled using hourly US weather data for eight (8) select cities. The three (3) compressor types simulated included: fixed speed, Danfoss VSH 088 variable speed, and mechanically modulated. The VSH 088 performed more energy efficiently than the mechanically modulated for all flow rates and US cities analyzed. However the VSH displayed significantly better energy performance compared to the mechanically modulated for oversized applications, reducing energy use by as much as 50%. In the absence of over sizing, the VSH 088 used between about 10-20% less energy than the mechanical modulating arrangement. Overall for all conditions analyzed, VSH 088 used 21% less annual energy than the mechanically modulating. 2
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