Journal
ENERGY CONVERSION AND MANAGEMENT
Volume 238, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.enconman.2021.114161
Keywords
Liquid air energy storage; Multi-energy system; District heating network; District cooling network; System integration; Decarbonisation
Categories
Funding
- EPSRC, UK [EP/R016402/1]
- Royal Society [IEC\NSFC\170264, NMG\R2\170082]
- EPSRC, UK, through the MY-STORE project [EP/N001974/1]
- University of Birmingham/University of Melbourne Priestley Joint PhD Scholarship
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This study investigates the techno-economic value of using LAES as a smart multi-energy asset, demonstrating that leveraging the vector-coupling capability of LAES can achieve more flexible district operation and increase energy efficiency.
Liquid Air Energy Storage (LAES) stores electricity in the form of a liquid cryogen while making hot and cold streams available during charging and discharging processes. The combination of electricity, hot and cold makes LAES a promising asset for the management of multi-energy streams in various energy systems; however, such opportunity has not received attention so far. To overcome the traditional view of LAES as electricity storage only, this study investigates the techno-economic value of using LAES as a smart multi-energy asset for the provision of heat and cold, alongside power, in districts with heating and cooling networks. A reduced thermodynamic model of LAES was developed, validated and used to i) quantify the thermodynamic efficiency for a multi-energy LAES, ii) generalise the multi-energy capability of LAES over the three energy vectors considered iii) link different plant designs and integration conditions - in terms of loads and temperatures - with the associated multi-energy LAES performance and iv) describe multi-energy LAES operation as part of two district sizes, for provision of peak and base load. It is found that, by leveraging the vector-coupling capability of LAES, more flexible district operation can be achieved, with increased LAES energy efficiency from 47% to 72.8% and up to 8-12% reduction of operational costs, in the considered integration case studies. Results demonstrate the technical feasibility of multi-energy LAES operation and illustrate the associated trade-offs and potential: new perspectives for smart management of multi-energy systems are opened up.
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