Reducing the Convective Losses of Cavity Receivers

被引：21

作者：

Flesch, Robert ^{[1
]}

Grobbel, Johannes ^{[1
]}

Stadler, Hannes ^{[1
]}

Uhlig, Ralf ^{[2
]}

Hoffschmidt, Bernhard ^{[3
]}

机构：

[1] German Aerosp Ctr DLR, Inst Solar Res, Prof Rehm Str 1, D-52428 Julich, Germany

[2] German Aerosp Ctr DLR, Inst Solar Res, Pfaffenwaldring 38-40, D-70567 Stuttgart, Germany

[3] German Aerosp Ctr DLR, Inst Solar Res, D-51147 Cologne, Germany

来源：

SOLARPACES 2015: INTERNATIONAL CONFERENCE ON CONCENTRATING SOLAR POWER AND CHEMICAL ENERGY SYSTEMS | 2016年 / 1734卷

关键词：

HEAT-LOSS;

D O I：

10.1063/1.4949066

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

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 degrees C. The cryogenic environment allows transforming the results from the small model cavity to a large scale receiver with Gr approximate to 3.9.10(10). 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.

引用

页数：8

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