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Findings from Measurements of the Electric Power Demand of Air Compressors

Author

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  • Ulf Hummel

    (Institute of Energy Economics and Rational Energy Use, University of Stuttgart, 70565 Stuttgart, Germany)

  • Peter Radgen

    (Institute of Energy Economics and Rational Energy Use, University of Stuttgart, 70565 Stuttgart, Germany)

  • Sercan Ülker

    (Institute of Energy Economics and Rational Energy Use, University of Stuttgart, 70565 Stuttgart, Germany)

  • Ralph Schelle

    (Institute of Energy Economics and Rational Energy Use, University of Stuttgart, 70565 Stuttgart, Germany)

Abstract

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

Suggested Citation

  • Ulf Hummel & Peter Radgen & Sercan Ülker & Ralph Schelle, 2021. "Findings from Measurements of the Electric Power Demand of Air Compressors," Energies, MDPI, vol. 14(24), pages 1-11, December.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:24:p:8395-:d:701332
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    References listed on IDEAS

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    1. Neale, James R. & Kamp, Peter J.J., 2009. "Compressed air system best practice programmes: What needs to change to secure long-term energy savings for New Zealand?," Energy Policy, Elsevier, vol. 37(9), pages 3400-3408, September.
    2. Saidur, R. & Rahim, N.A. & Hasanuzzaman, M., 2010. "A review on compressed-air energy use and energy savings," Renewable and Sustainable Energy Reviews, Elsevier, vol. 14(4), pages 1135-1153, May.
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    Cited by:

    1. António Gomes Martins & Luís Pires Neves & José Luís Sousa, 2023. "Electricity Demand Side Management," Energies, MDPI, vol. 16(16), pages 1-3, August.

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