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Liquid metals as efficient coolants for high-intensity point-focus receivers: implications to the design and performance of next generation CSP systems

Pacio, J. and Fritsch, Andreas and Singer, Csaba and Uhlig, Ralf (2014) Liquid metals as efficient coolants for high-intensity point-focus receivers: implications to the design and performance of next generation CSP systems. Energy Procedia, 49, pp. 647-655. Elsevier. DOI: 10.1016/j.egypro.2014.03.070 ISSN 1876-6102

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Abstract

To a large extent, the economic viability of CSP projects is influenced by the main parameters characterizing the receiver, such as concentration ratio, heat-flux-intensity and distribution, fluid outlet temperature and, naturally, the receiver efficiency. The design ranges for these parameters are in turn limited by the selection of the heat transfer fluid (HTF). In this work, two candidate liquid metals (LMs), namely sodium (Na) and lead-bismuth eutectic (LBE), are proposed as efficient HTFs that shall allow extending these design ranges beyond the current state-of-the-art, and thus contribution to the development of next-generation point-focus central receiver systems (CRSs). LMs offer two significant advantages compared to other HTFs used in CRSs. First, very high heat transfer coefficients can be achieved; roughly one order of magnitudes higher than with other liquids like molten nitrate salts, and many times the typical values of pressurized air; allowing to operate at higher heat flux intensities. Second, high fluid outlet temperatures can be achieved within stable liquids up to their boiling point (at 1 bar, Na: 883°C, LBE: 1533°C). Design considerations for implementing advanced concepts based on LM-cooling are analyzed in this work, evaluating their advantages and limitations. Previous experiences and theoretical evaluations indicate that a superior performance can be achieved with LMs, and the current state of technology reached a satisfactory maturity level for operating large-scale facilities.

Item URL in elib:https://elib.dlr.de/91911/
Document Type:Article
Title:Liquid metals as efficient coolants for high-intensity point-focus receivers: implications to the design and performance of next generation CSP systems
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Pacio, J.Karlsruhe Institute of Technology, Institute for Nuclear and Energy TechnologiesUNSPECIFIED
Fritsch, Andreasandreas.fritsch (at) dlr.deUNSPECIFIED
Singer, Csabacsaba.singer (at) dlr.deUNSPECIFIED
Uhlig, Ralfralf.uhlig (at) dlr.deUNSPECIFIED
Date:2014
Journal or Publication Title:Energy Procedia
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
Volume:49
DOI :10.1016/j.egypro.2014.03.070
Page Range:pp. 647-655
Publisher:Elsevier
Series Name:Elsevier Ldt.
ISSN:1876-6102
Status:Published
Keywords:heat transfer fluid, central receiver system, liquid metal
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:Concentrating Solar Systems (old)
DLR - Research area:Energy
DLR - Program:E SF - Solar research
DLR - Research theme (Project):E - Point-Focusing Systems (old)
Location: Stuttgart
Institutes and Institutions:Institute of Solar Research > Punktfokussierende Systeme
Deposited By: Uhlig, Tamara
Deposited On:13 Nov 2014 11:36
Last Modified:06 Sep 2019 15:22

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