Comparison of underwater and underground CAES systems for integrating floating offshore wind farms. (December 2017)

• Record Type: Journal Article
• Authors: Wang, Zhiwen; Xiong, Wei; Ting, David S.-K.; Carriveau, Rupp; Wang, Zuwen
• Is Part Of: Journal of energy storage. Volume 14:Part 2(2017)
• Page Start: 276
• Page End: 282
• Publication Date: 2017-12
• Subjects: Underwater -- Floating offshore wind -- Compressed air energy storage -- Isobaric -- Isochoric -- Exergy analysis; Energy storage -- Periodicals; Energy storage -- Research -- Periodicals; 621.3126
• DOI: 10.1016/j.est.2017.11.001
• Languages: English
• ISSNs: 2352-152X

Abstract

Highlights: Two integration systems are proposed to store the floating offshore wind energy. Exergy analyses are conducted and detailed exergy destruction is compared. The UWCAES system shows higher round-trip efficiency and exergy density. The advantages of UWCAES tend to diminish beyond the critical storage pressure. Abstract: Floating offshore wind farms (FOWF) with advanced adiabatic compressed air energy storage (AA-CAES) are thermodynamically scrutinized to evaluate if the compressed air is better stored underground or underwater. The corresponding energy efficiency is deduced based on an exergy analysis that details the exergy destruction of each system. The effects of key parameters such as storage and expansion pressures are examined parametrically. It is revealed the underwater compressed air energy storage has a higher efficiency and exergy density. These advantages tend to diminish beyond a critical storage pressure.