Abstract
An analysis of the stationary and sequential properties of daily
global horizontal solar radiation, on a discrete monthly basis, is
presented for a number of locations of widely varying climatic conditions.
Such information is essential as input to analytic models for the
long-term performance of solar energy systems and for the generation
of synthetic daily radiation sequences that can serve as input to
numerical simulations that model solar systems. The new aspects of
our study include (1) analysis of a solar radiation database that
is much larger than those considered heretofore and includes tropical
low-latitude, as well as temperate middle-latitude, climates, (2)
documentation of the magnitudes and correlations of generalized stationary
and sequential radiation statistics for a wide range of climatic
stations, (3) proposal of a simple functional form for the probability
density function for daily radiation and comparison with actual data,
(4) explicit consideration of confidence limits in predicting stationary
radiation statistics from a limited number of years of data, (5)
evidence that, contrary to the claims of most related studies, there
do not seem to be universal values or universal correlations for
either the persistence strengths or the persistence times of daily
radiation, and, (6) discussion of the practical value of statistical
studies of this nature for the design of solar energy systems.
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