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End-to-end efficiency of liquid piston based ocean compressed air energy storage

Vikram C Patil, Paul I. Ro, R. Kishore Ranganath
2016 OCEANS 2016 MTS/IEEE Monterey  

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Renewable energy resources require energy storage system for their optimal utilization. Ocean compressed air energy storage (OCAES) is a promising storage system for a utility-scale energy storage. An energy-efficient OCAES system can be built using isothermal liquid piston compressor/expander. Effect of various heat transfer enhancement techniques in the liquid piston on the end-toend efficiency of OCAES is analyzed in this study. Heat transfer enhancement techniques like optimal trajectories,
more » ... use of hollow spheres, spray cooling and porous media inserts are considered. It is observed that optimal trajectories can improve the efficiency of liquid piston based OCAES by about 5% over the base liquid piston based OCAES. Use of hollow spheres can improve by about 9%. Spray cooling and porous media indicate about 17% increase in end-to-end efficiency. This analysis indicates that liquid piston based OCAES can achieve significantly higher end-to-end efficiency over existing compressed air energy storage plants with the use of heat transfer enhancement technique in the liquid piston.
doi:10.1109/oceans.2016.7761399 fatcat:h7q5sw6wj5g77i2vrfdkzvxlwa
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Vikram C Patil, Paul I. Ro, R. Kishore Ranganath. "End-to-end efficiency of liquid piston based ocean compressed air energy storage." OCEANS 2016 MTS/IEEE Monterey (2016)