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@article{Khaljani:2021:10.1016/j.enconman.2021.114536,
author = {Khaljani, M and Harrison, J and Surplus, D and Murphy, A and Sapin, P and Markides, CN and Mahmoudi, Y},
doi = {10.1016/j.enconman.2021.114536},
journal = {Energy Conversion and Management},
pages = {1--19},
title = {A combined experimental and modelling investigation of an overground compressed-air energy storage system with a reversible liquid-piston gas compressor/expander},
url = {http://dx.doi.org/10.1016/j.enconman.2021.114536},
volume = {245},
year = {2021}
}

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TY  - JOUR
AB  - We consider a small-scale overground compressed-air energy storage (CAES) system intended for use in micro-grid power networks. This work goes beyond previous efforts in the literature by developing and showing results from a first-of-a-kind small-scale (20 kWh) near-isothermal CAES system employing a novel, reversible liquid-piston gas compressor and expander (LPGC/E). Additionally, we extend our study to assessments, for the first time, of the economic and environmental characteristics of these small-scale overground CAES systems through a combination of experimental, thermodynamic, technoeconomic and environmental analyses. Five system configurations are considered: (1) CAESbase, which is the base-case system; (2) CAESplate, in which parallel plates are inserted into the LPGC/E as a heat exchanger for achieving near-isothermal compression and expansion; (3) CAESPCM, in which a phase change material (PCM) is employed to store thermal energy from the compressed air during charging that is later recovered during discharge; (4) CAESPCM&plate, which is a combination of the CAESplate and CAESPCM arrangements; and (5) CAESheater, in which a heater is utilised instead of the PCM to preheat the compressed air during discharge. Data for the validation of a computational design tool based on which the assessments were performed were obtained from a prototype of the CAESbase system. Results show that the CAESPCM&plate system exhibits the highest roundtrip efficiency of 63% and the shortest payback period of 7 years; the latter with the inclusion of governmental incentives and an electricity smart export guarantee (SEG) support rate of 5.5 p/kWh (6.8 ¢/kWh). The CAESPCM&plate system is found to be cost-effective even without incentives, with a payback period of 10 years. This system is also associated with 71 tonnes of fuel consumption savings and reduced CO2 emissions amounting to 51 tonnes over a lifetime of 20 years.
AU  - Khaljani,M
AU  - Harrison,J
AU  - Surplus,D
AU  - Murphy,A
AU  - Sapin,P
AU  - Markides,CN
AU  - Mahmoudi,Y
DO  - 10.1016/j.enconman.2021.114536
EP  - 19
PY  - 2021///
SN  - 0196-8904
SP  - 1
TI  - A combined experimental and modelling investigation of an overground compressed-air energy storage system with a reversible liquid-piston gas compressor/expander
T2  - Energy Conversion and Management
UR  - http://dx.doi.org/10.1016/j.enconman.2021.114536
UR  - https://www.sciencedirect.com/science/article/pii/S0196890421007123?via%3Dihub
UR  - http://hdl.handle.net/10044/1/90907
VL  - 245
ER  -

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