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Numerical analysis of the influence of inclination angle and wind on the heat losses of cavity receivers for solar thermal power towers

Flesch, Robert and Stadler, Hannes and Uhlig, Ralf and Pitz-Paal, Robert (2014) Numerical analysis of the influence of inclination angle and wind on the heat losses of cavity receivers for solar thermal power towers. Solar Energy, 110, 427 - 437. Elsevier. DOI: 10.1016/j.solener.2014.09.045 ISSN 0038-092X

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Official URL: http://www.sciencedirect.com/science/article/pii/S0038092X14004873

Abstract

Abstract The convective heat losses of cavity receivers for solar thermal power towers are of great importance for the overall efficiency of the whole system. However, the influence of wind on these losses has not been studied sufficiently for large scale cavity receivers with different inclination angles. In this present study the impact of head-on and side-on wind on large cavity receivers with inclination angles in the range of 0° (horizontal cavity) to 90° (vertical cavity) is analyzed numerically. The simulation results are compared to data published in literature. When no wind is present the losses decrease considerably with increasing inclination angle of the receiver. In case of a horizontal receiver wind does not have a huge impact on the losses: they remain constant on a high level. In case of an inclined cavity wind increases the heat losses significantly in most of the cases, although the highest absolute value of the losses occurs for the horizontal receiver exposed to head on wind. In some cases, when wind is flowing parallel to the aperture plane, a reduction of the heat losses is observed. The temperature distribution in the cavity is analyzed in order to explain the impact of wind on the heat losses. Wind in general causes a shrinking of the zone with uniform high temperature in the upper region of the cavity, whereas wind flowing parallel to the aperture plane additionally inhibits hot air from leaving the cavity and therefore leads to an increased temperature in the lower zone.

Item URL in elib:https://elib.dlr.de/91397/
Document Type:Article
Title:Numerical analysis of the influence of inclination angle and wind on the heat losses of cavity receivers for solar thermal power towers
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Flesch, Robertrobert.flesch (at) dlr.deUNSPECIFIED
Stadler, Hanneshannes.stadler (at) dlr.deUNSPECIFIED
Uhlig, Ralfralf.uhlig (at) dlr.deUNSPECIFIED
Pitz-Paal, Robertrobert.pitz-paal (at) dlr.deUNSPECIFIED
Date:December 2014
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:110
DOI :10.1016/j.solener.2014.09.045
Page Range:427 - 437
Publisher:Elsevier
ISSN:0038-092X
Status:Published
Keywords:Concentrating solar power; Computational fluid dynamics; Open cavity receiver; Mixed convection; Wind
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: Jülich
Institutes and Institutions:Institute of Solar Research > Punktfokussierende Systeme
Deposited By: Flesch, Dr.-Ing Robert
Deposited On:06 Nov 2014 14:03
Last Modified:31 Jul 2019 19:48

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