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dc.contributor.authorPrieto, Cristina
dc.contributor.authorCabeza, Luisa F.
dc.description.abstractThermal energy storage (TES) increases concentrating solar power (CSP) plant capacity factors, but more important, improves dispatchability; therefore, reducing the capital cost of TES systems is very important to reduce cost of energy and serve as an enabler for commercial solar power plants. After presenting the concept of a novel cascade PCM configuration of CSP and demonstrating it energy efficiency, it is needed to develop a thoughtful economic evaluation of the concept. The goal of this paper was to investigate this system through annual modelling, engineering procurement company price quotes, and levelized cost metric comparison with a baseline case, the commercial two-tank molten salt storage system. Simulation results show that this new PCM concept decrease levelized costs of storage. The baseline of using shell and tube heat exchangers for PCM storage offers a reduction in capital and levelized cost, but this paper also shows that there are further cost reduction possibilities, as shown in the scenarios presented here, such as thermal conductivity enhancement, encapsulation of the PCM, or modification of the material to improve its thermal properties. Therefore, although the basic shell and tube PCM system has been shown to offer a cost savings, the 1.8% reduction in LCOE may not be worth the risk of further development. The shell and tube system should be a jumping off point to more appropriate technologies. The variants studied are likely to yield cost reductions in cost performance quotient (CPQ) as high at 80% and in LCOE as high as 10%, representing an unprecedented and valuable avenue of CSP plant cost reduction.
dc.description.sponsorshipThe research leading to these results has received funding from CDTI in the project Innterconecta Thesto (ITC-20111050). We would like to thank Abengoa Thermal Storage Team for their comments and suggestions. This work was partially funded by the Ministerio de Ciencia, Innovación y Universidades de España (RTI2018-093849-B-C31 - MCIU/AEI/FEDER, UE) and by the Ministerio de Ciencia, Innovación y Universidades - Agencia Estatal de Investigación (AEI) (RED2018-102431-T). Dr. Cabeza would like to thank the Catalan Government for the quality accreditation given to her research group GREiA (2017 SGR 1537). GREiA is a certified agent TECNIO in the category of technology developers from the Government of Catalonia. This work is partially supported by ICREA under the ICREA Academia programme.
dc.relation.ispartofJournal of Energy Storage, 2021, vol. 43, p. 103184-1-103184-15
dc.rightscc-by (c) Cristina Prieto, Luisa F. Cabeza, 2021
dc.subjectConcentrating solar power (CSP)
dc.subjectPhase change material (PCM)
dc.subjectThermal energy storage (TES)
dc.subjectLevelized cost of energy (LCOE)
dc.titleThermal energy storage with phase change materials in solar power plants. Economic analysis

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cc-by (c) Cristina Prieto, Luisa F. Cabeza, 2021
Except where otherwise noted, this item's license is described as cc-by (c) Cristina Prieto, Luisa F. Cabeza, 2021