Design of Ocean Compressed Air Energy Storage System

被引：4
|
作者：
Patil, Vikram C. [1 ]
Ro, Paul, I [1 ]
机构：
[1] North Carolina State Univ, Dept Mech & Aerosp Engn, Raleigh, NC 27695 USA
来源：
2019 IEEE UNDERWATER TECHNOLOGY (UT) | 2019年
关键词：
Ocean Energy; Energy Storage; Compressed Air; Liquid Piston; Efficiency; HEAT-TRANSFER;
D O I：
10.1109/ut.2019.8734418
中图分类号：
U6 [水路运输]; P75 [海洋工程];
学科分类号：
0814 ; 081505 ; 0824 ; 082401 ;
摘要：
Ocean renewable energy resources are intermittent and a large scale energy storage is needed for their optimal utilization. Ocean compressed air energy storage (OCAES) system is promising large-scale energy storage for integration of ocean energy with the electric grid. In OCAES, energy is stored in the form of compressed air in an underwater storage device. In this paper, modeling and design of various components in the OCAES system is presented. Furthermore, design specifications and efficiencies of the various components in the 2MWh storage system at 500 m ocean depth are evaluated. Design of compressor/expander is crucial for high efficiency and sensible component sizing. Tread-off between the polytropic index and stroke time should be addressed in the compressor/expander design. Compressor/expander volume can be divided into a large number of liquid piston cylinders to achieve high efficiency. Higher ocean depth of the air storage system decreases storage volume requirement but affects roundtrip efficiency. The roundtrip efficiency of OCAES can be significantly improved by designing compressor/expander operating under near-isothermal conditions.
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页数：8
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