A SPECTRAL MODEL OF LINKE TURBIDITY FACTOR AND ITS EXPERIMENTAL IMPLICATIONS

Citation
Jc. Grenier et al., A SPECTRAL MODEL OF LINKE TURBIDITY FACTOR AND ITS EXPERIMENTAL IMPLICATIONS, Solar energy, 52(4), 1994, pp. 303-313
Citations number
34
Categorie Soggetti
Energy & Fuels
Journal title
ISSN journal
0038092X
Volume
52
Issue
4
Year of publication
1994
Pages
303 - 313
Database
ISI
SICI code
0038-092X(1994)52:4<303:ASMOLT>2.0.ZU;2-P
Abstract
A model of Linke's turbidity factor, T(L), is developed by means of up dated spectral extraterrestrial irradiances and extinction coefficient s of gaseous absorbers. It is shown that the new values of T(L) are cl early different from those obtained by Kasten's formula which paramete rizes the optical thickness of the clean dry atmosphere. The model is used to investigate the dependence of T(L) on the relative optical air mass and to elucidate the relationships linking T(L) to Angstrom's tu rbidity coefficient and to the water vapor content. For any T(L), the corresponding value related to the air mass 2.0 can be determined. Suc h a standardized value is independent of solar elevation and is theref ore strictly representative of the atmospheric turbidity. It can be li nked to Angstrom's turbidity coefficient. Practical procedures and alg orithms for computing the standard Linke's turbidity factor and determ ining Angstrom's turbidity coefficient are described. A relationship f or converting the T(L) values obtained by Kasten's formula into the ne w values is proposed.