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| Content Provider | IET Digital Library |
|---|---|
| Author | Li, Perry Y. Saadat, Mohsen |
| Abstract | A compressed air energy storage system that uses a high pressure, isothermal air compressor/expander (C/E) has no carbon emission and is more efficient than a conventional system that uses fossil fuels. To be successful, the compressor/expander must be efficient and has high power density. However, there is a trade-off between efficiency and power density due to heat transfer. The authors’ previous work has shown that by optimising the compression/expansion trajectories in a liquid piston C/E, the power density can be improved by many times without sacrificing efficiency. Yet, to achieve the optimised trajectory, this requires a large liquid piston pump/motor that often operates at low displacement, low efficiency regime. This study proposes that by combining the liquid piston with a solid piston actuated via a hydraulic intensifier, the pump/motor size can be reduced significantly. A case study shows that with an optimal intensifier ratio, the pump/motor size is reduced by 85%, the ratio between maximum and minimum displacements is reduced by 7 times, and the mean efficiency is increased by 2.4 times. A full cycle dynamic simulation shows that the intensifier decreases, for the same pump/motor size, the total cycle time for over 50%, thus doubling the power density of the compressor/expander. |
| Starting Page | 1506 |
| Ending Page | 1514 |
| Page Count | 9 |
| ISSN | 17521416 |
| Volume Number | 10 |
| e-ISSN | 17521424 |
| Issue Number | Issue 10, Nov (2016) |
| Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/iet-rpg/10/10 |
| Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/10.1049/iet-rpg.2016.0055 |
| Journal | IET Renewable Power Generation |
| Publisher Date | 2016-08-05 |
| Access Restriction | Open |
| Rights Holder | © The Institution of Engineering and Technology |
| Subject Keyword | Compressed Air Energy Storage Compressed Air Energy Storage System Compression-expansion Trajectory Compressors Energy Storage Flow Requirement Reduction Full Cycle Dynamic Simulation Heat And Thermodynamic Processes Heat Transfer Hydraulic Intensifier Liquid Piston C-E Liquid Piston Near-isothermal Air Compressor-expander Liquid Piston Pump-motor Mean Efficiency Mechanical Engineering Optimal Intensifier Ratio Optimised Trajectory Power Density Pump-motor Size Reduction Storage in Mechanical Energy Total Cycle Time |
| Content Type | Text |
| Resource Type | Article |
| Subject | Renewable Energy, Sustainability and the Environment |
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