UNIGE document Scientific Article
previous document  unige:17195  next document
add to browser collection

Direct luminous efficacy and atmospheric turbidity—Improving model performance

Delaunay, J.J
Published in Solar energy. 1995, vol. 55, no. 2, p. 125-137
Abstract Of all the atmospheric constituents, aerosol content is shown to be responsible for the greatest variations in direct luminous efficacy. Some clarity is brought to the comparison between Linke's and Ångström's turbidity coefficients, respectively TL and β. Grenier's recent formulation of the optical thickness of a water and aerosol free atmosphere is presented here in a simplified expression. Based on these results and Dogniaux's illuminance turbidity factor, Til, two direct luminous efficacy models are derived, one of which is tuned to our experimental data. The input parameters are optical air mass, β, and water vapour content in the tuned version. These models perform significantly better than any of twelve other models found in the literature when compared to 1 yr's measurements from each of two sites in the U.S. and Switzerland. In both sites, β was derived from horizontal visibility estimated in a nearby airport.
Keywords IlluminanceLuminous efficacyModel
Full text
Research groups ISE Pôle Sciences
Systèmes énergétiques
(ISO format)
MOLINEAUX, Benoît, INEICHEN, Pierre, DELAUNAY, J.J. Direct luminous efficacy and atmospheric turbidity—Improving model performance. In: Solar energy, 1995, vol. 55, n° 2, p. 125-137. doi: 10.1016/0038-092X(95)00035-P https://archive-ouverte.unige.ch/unige:17195

537 hits



Deposited on : 2011-10-17

Export document
Format :
Citation style :