Comparison of underwater and underground CAES systems for integrating floating offshore wind farms

Wang, Zhiwen; Xiong, Wei; Ting, David S.‐K.; Carriveau, Rupp; Wang, Zuwen

doi:10.1016/j.est.2017.11.001

Cited by 26 publications

(7 citation statements)

References 20 publications

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“…Taking the Huntorf CAES plant as an example, Zaugg compared the existing isochoric storage and the isobaric storage with the same configurations, and the results showed that an isobaric system could deliver the same power output with only 23% of the total storage volume of an isochoric system. Wang et al theoretically compared an isochoric ACAES system and an isobaric ACAES system under the same conditions for storing offshore wind energy. It was found that the volume energy density of isobaric storage is about 2.5 times of that of isochoric storage.The ocean is a perfect reservoir for creating high hydrostatic pressure, thus isobaric CAES systems are preferred nearshore and offshore for storing the MRE.…”

Section: Mre Storagementioning

confidence: 99%

A review of marine renewable energy storage

et al. 2019

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Summary Marine renewable energies are promising enablers of a cleaner energy future. Some technologies, like wind, are maturing and have already achieved commercial success. Similar to their terrestrial counterparts, marine renewable energy systems require energy storage capabilities to achieve the flexibility of the 21st century grid demand. The unique difficulties imposed by a harsh marine environment challenge the unencumbered rise of marine renewable energy generation and storage systems. In this study, the fundamentals of marine renewable energy generation technologies are briefed. A comprehensive review and comparison of state‐of‐the‐art novel marine renewable energy storage technologies, including pumped hydro storage (PHS), compressed air energy storage (CAES), battery energy storage (BES), hydrogen energy storage (HES), gravity energy storage (GES), and buoyancy energy storage (ByES), are conducted. The pros and cons, and potential applications, of various marine renewable energy storage technologies are also compiled. Finally, several future trends of marine renewable energy storage technologies are connoted.

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Section: Mre Storagementioning

confidence: 99%

A review of marine renewable energy storage

et al. 2019

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“…Placing the storage tank underwater lessens safety and environmental concerns. Moreover, [20] reported that underwater CAES can achieve better efficiency over underground CAES for advanced adiabatic type CAES.…”

Section: Introductionmentioning

confidence: 99%

Effect of Integrating Metal Wire Mesh with Spray Injection for Liquid Piston Gas Compression

Ahn

Patil²,

2021

Energies

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Heat transfer enhancement techniques used in liquid piston gas compression can contribute to improving the efficiency of compressed air energy storage systems by achieving a near-isothermal compression process. This work examines the effectiveness of a simultaneous use of two proven heat transfer enhancement techniques, metal wire mesh inserts and spray injection methods, in liquid piston gas compression. By varying the dimension of the inserts and the pressure of the spray, a comparative study was performed to explore the plausibility of additional improvement. The addition of an insert can help abating the temperature rise when the insert does not take much space or when the spray flowrate is low. At higher pressure, however, the addition of spacious inserts can lead to less efficient temperature abatement. This is because inserts can distract the free-fall of droplets and hinder their speed. In order to analytically account for the compromised cooling effects of droplets, Reynolds number, Nusselt number, and heat transfer coefficients of droplets are estimated under the test conditions. Reynolds number of a free-falling droplet can be more than 1000 times that of a stationary droplet, which results in 3.95 to 4.22 times differences in heat transfer coefficients.

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“…These include EOLFI, Exquadrum, Moffatt & Nichol, Bright Energy Storage Technologies, Arothron, SEGULA Technologies, and etc. Compared with conventional isochoric Compressed Air Energy Storage (CAES) technology, isobaric underwater CAES can take advantage of hydrostatic pressure regulation …”

Section: Introductionmentioning

confidence: 99%

“…Compared with conventional isochoric Compressed Air Energy Storage (CAES) technology, isobaric underwater CAES can take advantage of hydrostatic pressure regulation. 11,20 There have been many studies that examine UWCAES as a vehicle for MRE storage. Fiaschi et al 21 proposed a versatile system for offshore renewable-energy conversion including UWCAES, thermal-energy storage, and batterypack electricity storage.…”

Section: Introductionmentioning

confidence: 99%

“…Vasel‐Be‐Hagh et al proposed a UWCAES‐Vortex Induced Vibration Aquatic Clean Energy (VIVACE) system to improve the efficiency of UWCAES systems. Wang et al integrated offshore wind farms with UWCAES systems. Sheng et al investigated the feasibility of the stand‐alone island daily power management using a tidal turbine farm and a UWCAES system with a cycle efficiency of 60.6%.…”

Section: Introductionmentioning

confidence: 99%

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Energy, exergy, and sensitivity analyses of underwater compressed air energy storage in an island energy system

et al. 2019

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Summary An underwater compressed air energy storage (UWCAES) system is integrated into an island energy system. Both energy and exergy analyses are conducted to scrutinize the performance of the UWCAES system. The analyses reveal that a round‐trip efficiency of 58.9% can be achieved. However, these two analyses identify different directions for further improvement. The heat exchangers, expanders, compressors, electric motors, and generators account for the most exergy destruction. A sensitivity analysis is also conducted to investigate the importance of different input parameters on the round‐trip exergy efficiency of the UWCAES system. The results of both local and global analyses show that the round‐trip exergy efficiency is most sensitive to the isentropic efficiency of the expanders and compressors, and the efficiencies of the electric motors and generators. The impacts of the heat exchangers, the self‐discharge rate of the air accumulator, the inner diameter of the pneumatic pipelines, and the insulation thickness of the hot‐oil tank on the round‐trip exergy efficiency are shown to be highly nonlinear.

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Comparison of underwater and underground CAES systems for integrating floating offshore wind farms

Cited by 26 publications

References 20 publications

A review of marine renewable energy storage

A review of marine renewable energy storage

Effect of Integrating Metal Wire Mesh with Spray Injection for Liquid Piston Gas Compression

Energy, exergy, and sensitivity analyses of underwater compressed air energy storage in an island energy system

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