Ocean compressed air energy storage (OCAES) is a promising large-scale energy storage concept. Different types of OCAES viz. - Diabatic, adiabatic and isothermal are possible based on the handling of heat in the system. In diabatic OCAES, compressed air is cooled in a cooler and heated using external heat source before transport to the expander. In Adiabatic OCAES, heat from the compressed air is stored in a thermal energy storage (TES) and reused to reheat compressed air before sending it to the expander. In Isothermal OCAES, air is compressed and expanded isothermally which results in the least compression work and highest expansion work. These OCAES configurations are assessed using exergy analysis in this paper. The exergy efficiency of individual components, exergy flow and overall efficiencies of diabatic, adiabatic and isothermal OCAES are presented. Results show that adiabatic OCAES shows improved efficiency over diabatic OCAES by storing thermal exergy of compressed air in TES and isothermal OCAES shows significantly higher efficiency over adiabatic and diabatic OCAES.
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ASME 2017 Power Conference Joint With ICOPE-17 collocated with the ASME 2017 11th International Conference on Energy Sustainability, the ASME 2017 15th International Conference on Fuel Cell Science, Engineering and Technology, and the ASME 2017 Nuclear Forum
June 26–30, 2017
Charlotte, North Carolina, USA
Conference Sponsors:
- Power Division
- Advanced Energy Systems Division
- Solar Energy Division
- Nuclear Engineering Division
ISBN:
978-0-7918-5761-8
PROCEEDINGS PAPER
Comparative Assessment of Different Types of Ocean Compressed Air Energy Storage Systems Based on Exergy Analysis
Vikram C. Patil,
Vikram C. Patil
North Carolina State University, Raleigh, NC
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Paul I. Ro
Paul I. Ro
North Carolina State University, Raleigh, NC
Search for other works by this author on:
Vikram C. Patil
North Carolina State University, Raleigh, NC
Paul I. Ro
North Carolina State University, Raleigh, NC
Paper No:
POWER-ICOPE2017-3630, V002T12A006; 9 pages
Published Online:
September 5, 2017
Citation
Patil, VC, & Ro, PI. "Comparative Assessment of Different Types of Ocean Compressed Air Energy Storage Systems Based on Exergy Analysis." Proceedings of the ASME 2017 Power Conference Joint With ICOPE-17 collocated with the ASME 2017 11th International Conference on Energy Sustainability, the ASME 2017 15th International Conference on Fuel Cell Science, Engineering and Technology, and the ASME 2017 Nuclear Forum. Charlotte, North Carolina, USA. June 26–30, 2017. V002T12A006. ASME. https://doi.org/10.1115/POWER-ICOPE2017-3630
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