Optimal efficiency-power relationship for an air motor-compressor in an energy storage and regeneration system

Caleb J. Sancken, Perry Y. Li

Research output: Chapter in Book/Report/Conference proceedingConference contribution

17 Scopus citations

Abstract

Compressing air from atmospheric pressure into high pressure storage and expanding the compressed air in reverse is a means of energy storage and regeneration for fluid power systems that can potentially improve energy density by an order of magnitude over existing accumulators. This approach, known as the "open accumulator" energy storage concept, as well as other applications such as compressed air powered cars, rely on the availability of efficient and power-dense air motor/compressors. Increasing power is typically accompanied by reducing efficiency with the trade-off being determined by the heat transfer capability. In this paper, the authors present the Pareto optimal trade-off between the efficiency and power for a given heat transfer capability and ambient temperature in an air motor/compressor to achieve a given pressure ratio. It is shown that the optimal frontier is generated by an air motor/compressor that compresses and expands the air via a sequence of adiabatic, isothermal, and adiabatic processes. For the same efficiency of 80%, such an optimal volume trajectory achieves 3-5 times increased power over ad-hoc volume trajectories. It is also shown that approximating the infinitely fast adiabatic portions by finite time processes do not significantly reduce the effectiveness of the optimal operating strategy.

Original languageEnglish (US)
Title of host publicationProceedings of the ASME Dynamic Systems and Control Conference 2009, DSCC2009
PublisherAmerican Society of Mechanical Engineers (ASME)
Pages1315-1322
Number of pages8
EditionPART B
ISBN (Print)9780791848920
DOIs
StatePublished - 2010
Event2009 ASME Dynamic Systems and Control Conference, DSCC2009 - Hollywood, CA, United States
Duration: Oct 12 2009Oct 14 2009

Publication series

NameProceedings of the ASME Dynamic Systems and Control Conference 2009, DSCC2009
NumberPART B

Other

Other2009 ASME Dynamic Systems and Control Conference, DSCC2009
CountryUnited States
CityHollywood, CA
Period10/12/0910/14/09

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