Zusammenfassung
The performance of daily and hourly diffuse horizontal solar irradiation
models and correlations is examined using an assembled data set of
multivariate meteorological time series from countries in the North
Mediterranean Belt area. The correlations reviewed use only daily
global, hourly global or daily diffuse irradiation as input, for
the daily or hourly time scale. The best overall performance was
presented by the Frutos correlation for the estimation of the daily
diffuse radiation by an adapted version of the Liu and Jordan correlation
for the mean daily diffuse radiation profile, and by the Hollands
and Crha model for estimation of hourly diffuse values from the corresponding
global values. The results show that the best correlation for each
site varies. Two empirical piecewise correlations were also developed
by the authors with the help of the data bank available, yielding
models that showed even better fits to the data. The results show
some seasonal and location dependence.
Nutzer