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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
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.
Related URLs:	Google Scholar: Wang, X UTAS Profile: Wang, X Google Scholar: Negnevitsky, M UTAS Profile: Negnevitsky, M
Item Statistics:	View statistics for this item

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