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Techno-economic analysis of solar thermal power plants using liquid sodium as heat transfer fluid

Fritsch, Andreas and Frantz, Cathy and Uhlig, Ralf (2018) Techno-economic analysis of solar thermal power plants using liquid sodium as heat transfer fluid. Solar Energy, 177, pp. 155-162. Elsevier. DOI: 10.1016/j.solener.2018.10.005 ISSN 0038-092X

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Official URL: https://www.sciencedirect.com/science/article/pii/S0038092X18309848?via%3Dihub

Abstract

Solar thermal power plants with central receiver and thermal storage are expected to be one key technology in future electricity generation, because they are renewable and due to the thermal storage independent of the current solar radiation. State-of-the-art solar power plants often use molten nitrate salts as heat transfer fluid. The use of liquid sodium instead leads to lower electricity generation costs. Sodium has a high thermal conductivity and thus large heat transfer rates are possible. Hence, a smaller absorber surface is sufcient for the same thermal power. As a result, the sodium receiver achieves a higher efciency at lower investment cost. Additionally, the aiming strategy, which reduces the peak heat flux on molten salt receivers isn’t necessary for sodium. Even at high heat flux densities, the absorber tubes will be cooled sufciently due to the high heat transfer coefcients. Therefore, the sodium receiver in this analysis is designed for one single aim point, resulting in a heat flux density of qmean = 1.06 MW/m2 and qpeak = 2.99 MW/m2. The state-of-the-art system with molten salt considers qmean 0.51 MW/m2 and qpeak 1.0 MW/m2. The presented techno-economic analysis of two sodium based concepts compared to a reference system with molten salt results in up to 16% lower electricity generation costs.

Item URL in elib:https://elib.dlr.de/125910/
Document Type:Article
Title:Techno-economic analysis of solar thermal power plants using liquid sodium as heat transfer fluid
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Fritsch, AndreasAndreas.Fritsch (at) dlr.deUNSPECIFIED
Frantz, Cathycathy.frantz (at) dlr.deUNSPECIFIED
Uhlig, RalfRalf.Uhlig (at) dlr.deUNSPECIFIED
Date:14 November 2018
Journal or Publication Title:Solar Energy
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:177
DOI :10.1016/j.solener.2018.10.005
Page Range:pp. 155-162
Publisher:Elsevier
Series Name:Elsevier Ltd.
ISSN:0038-092X
Status:Published
Keywords:Concentrated solar power, Central receiver system LCOE calculation, Molten salt, Liquid metals, Sodium
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:Concentrating Solar Thermal Technology
DLR - Research area:Energy
DLR - Program:E SW - Solar and Wind Energy
DLR - Research theme (Project):E - Advanced Heat Transfer Media
Location: Stuttgart
Institutes and Institutions:Institute of Solar Research > Solartowersystems
Deposited By: Uhlig, Tamara
Deposited On:14 Jan 2019 14:17
Last Modified:31 Jul 2019 20:23

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