Journal
SOLAR ENERGY
Volume 118, Issue -, Pages 622-633Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.solener.2015.06.007
Keywords
Concentrated solar energy; High temperature solid particle receiver; Upward particle suspension; Heat transfer coefficient
Categories
Funding
- European Commission [282 932]
- Energy Programme of French CNRS
- Programme Investissements d'avenir of the Agence Nationale de la Recherche of the French State [ANR-10-EQPX-49-S OCRATE]
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A dense particles suspension was tested in a high temperature single tube on-sun solar receiver at the French National Centre for Scientific Research (in French: Centre National de la Recherche Scientifique = CNRS) solar facility. A powder outlet temperature as high as 750 degrees C was measured thus proving the capacity of this heat transfer fluid concept to reach high operating temperatures. The wall-to-suspension heat transfer coefficient was calculated on the basis of detailed temperature measurements and accounting for the strong recirculation phenomena occurring at the tube wall. It ranges from 420 W/m(2) K to 1100 W/m(2) K for a solid mass flux of 10 kg/m(2) s and 45 kg/m(2) s, respectively. The temperature increase positively influences the heat transfer coefficient; with a 30% increase measured between similar to 200 degrees C and 600 degrees C average powder temperatures. Finally, a correlation is proposed to predict the dependency of the heat transfer coefficient and solid mass flux. (C) 2015 Elsevier Ltd. All rights reserved.
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