Liu, S;
Wu, S;
Hu, Y;
Li, H;
(2019)
Comparative analysis of air and CO₂ as working fluids for compressed and liquefied gas energy storage technologies.
Energy Conversion and Management
, 181
pp. 608-620.
10.1016/j.enconman.2018.12.031.
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Abstract
With the large-scale use of intermittent renewable energy worldwide, such as wind energy and solar energy, energy storage systems are urgently needed and have been rapidly developed. Technologies of compressed gas energy storage (CGES) and liquefied gas energy storage (LGES) are playing an important role, and air has been commonly used as working fluid. CO₂ is another potential working fluid and attracting more and more attention due to the rise of CO₂ capture and utilization. However, it is still unclear which is the better working fluid. This paper comparatively analyzed the performance of CGES and LGES systems using air and CO₂ as working fluids. Both diabatic and adiabatic CGES are considered. Simulation results show that except diabatic CGES systems, using CO₂ could achieve a similar or even higher round-trip efficiency than using air. In addition, the use of CO₂ instead of air as a working fluid has additional advantages, such as a lower storage temperature can be achieved at the same storage pressure for the adiabatic CGES system; and a higher condensing temperature can be achieved at the same condensing pressure for the LGES system, which can benefit the system design and operation.
| Type: | Article |
|---|---|
| Title: | Comparative analysis of air and CO₂ as working fluids for compressed and liquefied gas energy storage technologies |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.enconman.2018.12.031 |
| Publisher version: | https://doi.org/10.1016/j.enconman.2018.12.031 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Compressed gas energy storage system, Liquefied gas energy storage system, Round-trip efficiency, Simulation, CO₂ utilization |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10067159 |
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