Article,
Estimation of daily Linke turbidity factor by using global irradiance measurements at solar noon
Solar Energy, (2009)
Abstract
This work presents a methodology for estimating daily Linke turbidity
factor for clear sky days from global horizontal irradiance information
at solar noon and monthly mean values of the Linke turbidity factor.
The analysis of the method proposed here have been made using the
ESRA clear sky model to recalculate the direct normal irradiance
using as input the new Linke turbidities. Ground data of three BSRN
and six AEMet radiometric meteorological stations have been used
for assessing the method. Linke turbidity factor estimated here exhibits
higher fluctuations than the monthly means and the comparison of
the solar irradiance recalculated with the ground data have shown
a noticeable reduction of the root mean square deviation. On the
other hand the new Linke turbidity estimations have been compared
to those values obtained from normal beam irradiance measures. The
discrepancies found point out the high dependence of the reliability
of this method with the quality of the ground measurements used.
