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How to cite this article: Cyulinyana MC, Ferrer P. Heat efficiency of a solar trough receiver with a hot mirror compared to a selective coating. S Afr J Sci. 2011;107(11/12), Art. #524, 7 pages. http:// dx.doi.org/10. 4102/sajs. v107i11/12.524 In this article, we present a solar trough system in which the receiver pipe is enclosed in a glass cover under vacuum. The dominant radiation losses from the receiver are reduced by the use of a 'hot mirror' on the glass cover instead of a selectivedoi:10.4102/sajs.v107i11/12.524 fatcat:pvav5r2fv5aezk2ajtv22kc72a