Search

More than 55,000 data of hourly solar radiation on a horizontal surface and on vertical surfaces exposed to the south, west, north and east, measured at Arcavacata di Rende (CS), were compared with hourly radiation data calculated by various calculation models. Erbs, Reindl et al. and Skartveit et al. correlations for the split of hourly global radiation in the diffuse and beam components were used together with the isotropic sky model and three anisotropic sky models. The agreement between experimental and calculated data is generally good. Keywords: Solar radiation; Tilted surfaces; Calculation models validation

To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.solener.2005.06.012 Byline: M. Cucumo, A. De Rosa, V. Marinelli Keywords: Atmosphere; Transparency window; Emissivity Abstract: An experimental verification of the correlations existing in literature for the calculation of the coefficient of emissivity inside the atmospheric transparency window, situated in the wavelength band 8-14[mu]m, has been performed. In addition, the authors propose a new correlation for the calculation of the coefficient I[micro].sub.in, easily applicable since it presupposes the knowledge of the global emissivity of the sky, for which there are a lot of correlations in literature. Author Affiliation: Department of Mechanical Engineering, University of Calabria, 87030 Arcavacata di Rende (CS), Italy Article History: Received 22 February 2005; Revised 15 June 2005; Accepted 15 June 2005 Article Note: (miscellaneous) Communicated by: Associate Editor Pierre Ineichen