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Reducing the Convective Losses of Cavity Receivers

Flesch, Robert and Grobbel, Johannes and Stadler, Hannes and Uhlig, Ralf and Hoffschmidt, Bernhard (2015) Reducing the Convective Losses of Cavity Receivers. SolarPACES conference 2015, 13-16. Oktober 2015, Kapstadt.

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Abstract

Convective losses reduce the efficiency of cavity receivers used in solar power towers especially under windy conditions. Therefore, measures should be taken to reduce these losses. In this paper two different measures are analyzed: an air curtain and a partial window which covers one third of the aperture opening. The cavity without modifications and the usage of a partial window were analyzed in a cryogenic wind tunnel at -173°C. The cryogenic environment allows transforming the results from the small model cavity to a large scale receiver with Gr≈3.9∙1010. The cavity with the two modifications in the wind tunnel environment was analyzed with a CFD model as well. By comparing the numerical and experimental results the model was validated. Both modifications are capable of reducing the convection losses. In the best case a reduction of about 50 % was achieved.

Item URL in elib:https://elib.dlr.de/100998/
Document Type:Conference or Workshop Item (Speech)
Title:Reducing the Convective Losses of Cavity Receivers
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Flesch, Robertrobert.flesch (at) dlr.deUNSPECIFIED
Grobbel, Johannesjohannes.grobbel (at) dlr.deUNSPECIFIED
Stadler, Hanneshannes.stadler (at) dlr.deUNSPECIFIED
Uhlig, Ralfralf.uhlig (at) dlr.deUNSPECIFIED
Hoffschmidt, Bernhardbernhard.hoffschmidt (at) dlr.deUNSPECIFIED
Date:September 2015
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Solar Thermal Power, Cavity receiver, convection, reduction strategies
Event Title:SolarPACES conference 2015
Event Location:Kapstadt
Event Type:international Conference
Event Dates:13-16. Oktober 2015
Organizer:SolarPACES
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:Concentrating Solar Thermal Technology
DLR - Research area:Energy
DLR - Program:E SF - Solar research
DLR - Research theme (Project):E - Advanced Heat Transfer Media (old)
Location: Jülich
Institutes and Institutions:Institute of Solar Research > Punktfokussierende Systeme
Deposited By: Flesch, Dr.-Ing Robert
Deposited On:17 Dec 2015 14:03
Last Modified:17 Dec 2015 14:03

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