Transmission characteristics of exergy for novel compressed air energy storage systems-from compression and expansion sections to the whole system

Huan Guo, Yujie Xu, Xinjing Zhang, Xuezhi Zhou and Haisheng Chen

Energy, 2020, vol. 193, issue C

Abstract: Exergy flow characteristics of novel compressed air energy storage (CAES) is significant to evaluate CAES performance while few literatures have addressed this topic. The exergy flow characteristics of two cutting edge CAES systems, compressed air energy storage systems with thermal energy storage (TS-CAES) and supercritical compressed air energy storage (SC-CAES) systems are studied in this paper. All processes of the two systems are modeled (compression section, expansion section, air storage section for TS-CAES and cold storage/liquefaction section for SC-CAES) based on the commonness of the two systems. Exergy is decomposed into thermal and mechanical exergy for their different flow directions and characteristics. Thus, a general exergy flow model for the two systems was established. With the general model, the variations of the relevant proportional ratios and exergy transfer efficiencies with key parameters are revealed. Meanwhile, the energy coupling mechanism for the two systems are explored as well. For TS-CAES systems, except for the number of parts, the variation of each parameter only dominates the change of exergy transfer efficiency of a certain term or some two. All the variables except the pressure loss coefficient of the intercooler and the polytropic efficiency of the compressor, have large effect on the thermal exergy transfer efficiency of their respective flow section. For SC-CAES systems, with the increase of energy storage/release pressure, the system efficiency increases first and then decreases, which is due to change of liquefaction ratio.

Keywords: Compressed air energy storage with thermal energy storage; Supercritical compressed air energy storage; Exergy analysis; Transmission characteristics (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (17)

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0360544219324934
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:193:y:2020:i:c:s0360544219324934

DOI: 10.1016/j.energy.2019.116798

Access Statistics for this article

Energy is currently edited by Henrik Lund and Mark J. Kaiser

More articles in Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().