Partial load operation analysis of trigeneration subcooled compressed air energy storage system

Ali Sulaiman Alsagri, Ahmad Arabkoohsar, Abdulrahman A. Alrobaian

Research output: Contribution to journalJournal articleResearchpeer-review

28 Citations (Scopus)


Subcooled compressed air energy storage system is a trigeneration technology that has been recently introduced to the literature. In the charging mode, the system stores the surplus power of a renewable energy system in the form of compressed air in a cavern and generates much heat as well. In the discharging mode, when the renewable power plant demands extra electricity, the system reclaims the compressed air to be expanded through a specific type of turbine and thereby generates electricity as well as a large amount of cold. At nominal load, when all the components are working at their optimal states, a high coefficient of performance of about 1.5 has been achieved for the system over a complete charging-discharging round. This paper, however, investigates thermodynamically and environmentally the performance of this technology while working at off-design conditions. For this, realistic performance curves for various components of the system are employed and the system operation is simulated for various operational conditions. The results show that the storage unit is best to work on its highest possible charging-discharging loads; otherwise, the overall efficiency would fall remarkably. The trigeneration/storage system overall performance coefficient will decrease to 1.27% and 1.05% if the operational load drops to 50% and 10%, respectively.
Original languageEnglish
Article number117948
JournalJournal of Cleaner Production
Number of pages12
Publication statusPublished - 20 Nov 2019


  • Subcooled compressed air energy storage
  • Partial load operation
  • Trigeneration
  • Energy efficiency
  • Performance curve
  • Environmental analysis


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