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On the influence of wind on cavity receivers for solar power towers: an experimental analysis

Flesch, Robert and Stadler, Hannes and Uhlig, Ralf and Hoffschmidt, Bernhard (2015) On the influence of wind on cavity receivers for solar power towers: an experimental analysis. Applied Thermal Engineering, 87, pp. 724-735. Elsevier. DOI: 10.1016/j.applthermaleng.2015.05.059 ISSN 1359-4311

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Official URL: http://www.sciencedirect.com/science/article/pii/S1359431115005153

Abstract

The influence of wind on the convective losses of cavity receivers for solar power towers was analyzed experimentally in a cryogenic wind tunnel. At an ambient temperature of -173 °C a Grashof number of Gr=3.9E10 can be reached. Six different wind directions ranging from head-on to rearward flow, five wind speeds up to Re=5.2E5 and four inclination angles of the cavity in the range of phi=0°...90° were analyzed. With a similarity approach the results can be transferred to a receiver in normal ambient conditions with an inner diameter of 2.4 m and a wall temperature of approximately 730 °C. The methodology and its restrictions are discussed in detail. The experiments show that the influence of wind on large horizontal receivers is small. However, with increasing inclination angle the receiver becomes more susceptible to wind, although the convective losses never exceed those of the horizontal cavity. In some cases a reduction of the convective losses under the level of natural convection was observed if wind is present. Additionally, local information about the heat losses of different heater sections are presented, which are used to analyze the heat loss mechanisms inside the cavity. A shrinking of the stagnant zone is found to be the main reason for the increasing losses.

Item URL in elib:https://elib.dlr.de/96290/
Document Type:Article
Title:On the influence of wind on cavity receivers for solar power towers: an experimental analysis
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
Hoffschmidt, Bernhardbernhard.hoffschmidt (at) dlr.deUNSPECIFIED
Date:2015
Journal or Publication Title:Applied Thermal Engineering
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:87
DOI :10.1016/j.applthermaleng.2015.05.059
Page Range:pp. 724-735
Publisher:Elsevier
ISSN:1359-4311
Status:Published
Keywords:concentrating solar power, wind tunnel, 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:25 May 2015 10:40
Last Modified:06 Sep 2019 15:16

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