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Advanced Exergy Analysis of Adiabatic Underwater Compressed Air Energy Storage System
Lukasz Szablowski1, Tatiana Morosuk2
1Institute of Heat Engineering, Warsaw University of Technology, 00-665 Warsaw, Poland.
Entropy (Basel, Switzerland)
|January 21, 2023
Summary
Adiabatic underwater compressed air energy storage (CAES) systems offer a promising large-scale energy storage solution. Advanced exergy analysis highlights heat exchangers as key for improving system efficiency and reducing energy loss.
Area of Science:
- Energy Storage
- Renewable Energy Systems
- Thermodynamics
Background:
- Renewable energy expansion necessitates efficient large-scale energy storage.
- Pumped storage is dominant, but compressed air energy storage (CAES) presents an alternative.
- Adiabatic underwater CAES is explored for its potential in grid-scale energy management.
Purpose of the Study:
- To evaluate an adiabatic underwater compressed air energy storage system.
- To identify areas for efficiency improvement using advanced exergy analysis.
- To assess the thermodynamic performance and potential optimizations of the CAES system.
Main Methods:
- Modeling an adiabatic underwater CAES system using Aspen HYSYS software.
- Applying advanced exergy analysis to identify exergy destruction points.
- Simulating system operation during off-peak charging and peak discharge periods.
Main Results:
- Advanced exergy analysis revealed component interactions and optimization opportunities.
- Heat exchangers were identified as critical for significant exergy destruction reduction.
- The system achieved a round-trip efficiency of 64.1% under real conditions and 87.9% under unavoidable conditions.
Conclusions:
- The adiabatic underwater CAES system shows potential for large-scale energy storage.
- Targeted improvements, particularly in heat exchangers, can enhance overall system efficiency.
- Exergy analysis provides valuable insights for optimizing renewable energy storage technologies.
Keywords:
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