Findings from Measurements of the Electric Power Demand of Air Compressors

The compressed air electric ratio (CAER) describes the of real power demand to nominal mechanical an compressor. CAER is important indicator as compressors varies throughout its operation dependent on compressor technology, pressure ratio, and free delivery. nameplate drive motor not sufficient for evaluating demand; therefore, plays role in assessing operating demand. In this paper, results from measurements fixed speed variable (VFD) are presented with analysis key influencing factors CAER. data show that maximum design outlet has largest impact For VFD compressors, represented a linear function respective load. Fixed compressors’ CAERs always load condition. idle condition, was measured be 0.2. full condition 0.6, averages at value 0.87, meaning 90 kW 0.6 draws 78.3 power.