Journal
SOLAR ENERGY
Volume 85, Issue 9, Pages 1910-1914Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.solener.2011.04.032
Keywords
Parabolic trough receiver; One-dimensional empirical model; Thermal performance of heat loss; Outer vacuum shell
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The useful heat gain of a parabolic collector system is directly dependent on the heat loss from the absorber at its operating temperature. Selective coatings with evacuated/non evacuated glass tubes are employed to control radiative and convective heat losses. A concentric glass shell under vacuum is investigated for its thermal performance as this method circumvents the need for direct sealing between the glass envelope and the metal receiver to maintain vacuum and its related technical challenges. The performance is compared against a non evacuated receiver and its influence under different wind velocities; emissivities are calculated by a one dimensional theoretical model and solved by an iterative method. (C) 2011 Elsevier Ltd. All rights reserved.
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