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Wind tunnel measurements of forced convective heat loss from multi-megawatt cavities of solar central receiver systems

Siegrist, Silvan and Stadler, Hannes and Hoffschmidt, Bernhard (2018) Wind tunnel measurements of forced convective heat loss from multi-megawatt cavities of solar central receiver systems. Solar Energy. Elsevier. DOI: 10.1016/j.solener.2018.04.029 ISSN 0038-092X

Full text not available from this repository.

Official URL: https://www.sciencedirect.com/science/article/pii/S0038092X18303748

Abstract

We investigated the forced convective heat loss from a model of a multi-megawatt cavity receiver of a concentrated solar power (CSP) tower system in a high-pressure wind tunnel. Measurements of 5 geometrical configurations of this model as well as measurement uncertainties are reported in this contribution. The experiment covered a Reynolds number range of between 2·10^6 and 8·10^6, based on the external dimensions and flow field. In general, the measured values are highly sensitive to the geometrical configuration, the wind velocity, and the wind direction. The results show that the maximum forced convective heat loss for all configurations occurs when the wind blows from frontal directions of between 60° and 80° relative to the tower symmetry plane. We found that the peak location does not vary for different inclinations, but does vary for different aperture openings. Also, the results show that the direction of the wind causes the forced convective heat loss to vary with a factor of up to 6.1, but at least with a factor of 2.6. Last but not least, our power-law correlation of the dependency of the forced convective heat loss on the Reynolds number matches literature values.

Item URL in elib:https://elib.dlr.de/124226/
Document Type:Article
Title:Wind tunnel measurements of forced convective heat loss from multi-megawatt cavities of solar central receiver systems
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Siegrist, SilvanSilvan.Siegrist (at) dlr.dehttps://orcid.org/0000-0001-9069-2220
Stadler, HannesHannes.Stadler (at) dlr.dehttps://orcid.org/0000-0001-5122-4221
Hoffschmidt, Bernhardbernhard.hoffschmidt (at) dlr.deUNSPECIFIED
Date:21 May 2018
Journal or Publication Title:Solar Energy
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1016/j.solener.2018.04.029
Publisher:Elsevier
ISSN:0038-092X
Status:Published
Keywords:Forced convection heat loss; Concentrated solar power; Solar central receiver; Multi-megawatt cavity receiver
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: Jülich
Institutes and Institutions:Institute of Solar Research > Solartowersystems
Deposited By: Siegrist, Silvan
Deposited On:17 Dec 2018 10:08
Last Modified:17 Dec 2018 10:08

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