NDLI: Thermodynamic Analysis of a Compressed Air Energy Storage Facility Exporting Compression Heat to an External Heat Load

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Safaei, Hossein Michael, J. Aziz
Copyright Year	2014
Abstract	Fluctuations of electric load call for flexible generation technologies such as gas turbines. Alternatively, bulk energy storage (BES) facilities can store excess off-peak electricity to generate valuable peaking electricity. Interest in electricity storage has increased in the past decade in anticipation of higher penetration levels of intermittent renewable sources such as wind. Compressed Air Energy Storage (CAES) is one of the most promising BES technologies due to the large amount of energy (hundreds of MWh) that can be economically stored. CAES uses off-peak electricity to compress air into underground reservoirs. Air is combusted and expanded at a later time to regenerate electricity. One of the downsides of CAES is the large energy losses incurred in the form of waste compression heat. Distributed CAES (D-CAES) has been proposed in order to improve the roundtrip efficiency of CAES by utilizing the compression heat for space and water heating. The compressor of D-CAES is located near a heat load (e.g. a shopping mall) and the compression heat is recovered to meet this external load. D-CAES collects fuel credits equal to the negated heating fuel, leading to a higher overall efficiency compared to conventional CAES. We perform a thermodynamic analysis of conventional CAES and D-CAES to compare their heat rate, work ratio (electric energy stored per unit of electric energy regenerated), and exergy efficiency.
Sponsorship	International
File Format	PDF
ISBN	9780791845851
DOI	10.1115/ESDA2014-20412
Volume Number	Volume 3: Engineering Systems; Heat Transfer and Thermal Engineering; Materials and Tribology; Mechatronics; Robotics
Conference Proceedings	ASME 2014 12th Biennial Conference on Engineering Systems Design and Analysis
Language	English
Publisher Date	2014-07-25
Publisher Place	Copenhagen, Denmark
Access Restriction	Subscribed
Subject Keyword	Wind Compression Compressors Fuels Stress Heat Gas turbines Storage Compressed air Energy dissipation Heating Electric load Fluctuations (physics) Reservoirs Exergy Hot water heating Energy storage
Content Type	Text
Resource Type	Article

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