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Thermodynamic and exergy analysis of a combined pumped hydro and compressed air energy storage system



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Abstract
renewable energy sources such as wind and solar. In this paper, a comprehensive thermodynamic and exergy model is developed to study the thermal characteristics of a combined Pumped-Hydro and Compressed-Air (PHCA) energy storage system. The effect of key parameters, including storage pressure, pre-set pressure, aircompression mode and pump/hydroturbine efficiency on system performance is investigated. The results showed that an optimum pre-set pressure existed to maximize energy storage level for a specific storage pressure. The storage pressure also showed a large effect on the energy storage level and work output. As the storage pressure increased from 4 to 16 MPa, the energy storage level and work output increased remarkably. Furthermore, the performance of a PHCA system was largely influenced by the air compression/expansion mode in the energy storage vessel. The PHCA system stored 10% more energy through an isothermal compression process than that through an isentropic air compression process. It generated 14% more work output through an isothermal expansion process than that through an isentropic air expansion process. The exergy analyses showed that exergy destruction in pump was about 15% higher than that in hydroturbine.
Item Type: | Article |
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Authors/Creators: | Mozayeni, H and Wang, X and Negnevitsky, M |
Keywords: | pumped hydro, compressed air, thermodynamic analysis, exergy analysis, energy storage |
Journal or Publication Title: | Sustainable Cities and Society |
Publisher: | Elsevier |
ISSN: | 2210-6707 |
DOI / ID Number: | 10.1016/j.scs.2019.101527 |
Copyright Information: | © 2019 Elsevier Ltd. All rights reserved. |
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