Abstract
A selection of eight high performance clear sky solar irradiance
models is evaluated against a set of 16 independent data banks covering
20 years/stations, altitudes from sea level to 1600 m and a large
range of different climates. Their performance evaluated on very
clear condition measurements are within 4% in term of standard deviation.
The conclusions are that the accuracy of the input parameters such
as the turbidity is crucial in the validity of the obtained radiation
components, and that the choice of a specific model is secondary.
The model selection criteria should be based upon either implementation
simplicity, input parameter availability (Linke turbidity or aerosol
optical depth) or the capacity of the model to produce spectral radiation.
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