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Advanced heat transfer fluids for direct molten salt line-focusing CSP plants

Bonk, Alexander and Sau, Salvatore and Uranga, Nerea and Hernaiz, Marta and Bauer, Thomas (2018) Advanced heat transfer fluids for direct molten salt line-focusing CSP plants. Progress in Energy and Combustion Science, 67, pp. 69-87. Elsevier. DOI: 10.1016/j.pecs.2018.02.002 ISSN 0360-1285

Full text not available from this repository.

Official URL: https://www.sciencedirect.com/science/article/pii/S0360128517301120

Abstract

Concentrating solar power coupled to thermal energy storage (TES) is a vastly growing industrial process allowing for the generation of dispatchable and green electricity. This paper focuses on direct molten salt line-focusing technology using linear Fresnel and parabolic trough collector systems. Direct molten salt technology utilizes molten salt as heat transfer fluid in solar field and TES medium. Nitrate salts can be applied since they cover a wide temperature range. As storage medium Solar Salt, a binary NaNO3-KNO3 (60-40 wt%) mixture, is most commonly used but variations of this system have promising thermal properties in terms of a lower melting temperature to minimize the risk of undesired salt freezing events. These modified salts are typically ternary, ternary reciprocal or higher order systems formed by adding additional cations, anions or both. In this study five molten salt systems Solar Salt, HitecXL (CaKNa//NO3), LiNaK-Nitrate, Hitec (NaK//NO23) and CaLiNaK//NO23 are both investigated and critically reviewed. Their thermo-physical properties including phase diagrams, composition, melting ranges, melting temperature, minimum operation temperature, thermal stability, maximum operation temperature, density, heat capacity, thermal conductivity, viscosity and handling are evaluated and the most recommended values are discussed and highlighted. This review contributes to a better understanding of how the listed properties can be determined in terms of measurement conditions and provides temperature dependent data useful for future simulations of direct molten salt LF CSP plants.

Item URL in elib:https://elib.dlr.de/116575/
Document Type:Article
Title:Advanced heat transfer fluids for direct molten salt line-focusing CSP plants
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Bonk, Alexanderalexander.bonk (at) dlr.dehttps://orcid.org/0000-0002-0676-7267
Sau, Salvatoresalvatore.sau (at) enea.itUNSPECIFIED
Uranga, Nereanerea.uranga (at) tekniker.esUNSPECIFIED
Hernaiz, Martamarta.hernaiz (at) tekniker.esUNSPECIFIED
Bauer, Thomasthomas.bauer (at) dlr.dehttps://orcid.org/0000-0003-4080-7944
Date:2 March 2018
Journal or Publication Title:Progress in Energy and Combustion Science
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:67
DOI :10.1016/j.pecs.2018.02.002
Page Range:pp. 69-87
Publisher:Elsevier
ISSN:0360-1285
Status:Published
Keywords:Concentrating Solar Power Heat Transfer Fluids (HTF) Thermal Energy Storage (TES) Molten Nitrate Salts Review of thermo-pyhsical properties
HGF - Research field:Energy
HGF - Program:Storage and Cross-linked Infrastructures
HGF - Program Themes:Thermal Energy Storage
DLR - Research area:Energy
DLR - Program:E SP - Energy Storage
DLR - Research theme (Project):E - Thermochemical Processes (Storage)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Thermal Process Technology
Deposited By: Bonk, Alexander
Deposited On:27 Apr 2018 15:54
Last Modified:30 May 2019 22:07

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