engleski

Annual models of monthly mean hourly direct, diffuse and global solar radiation at ground

A method is proposed for estimating monthly mean hourly direct, diffuse, and global solar radiation from annual stochastical models (correlation coefficients are higher than 0.99), using only actual and daily maximum solar elevation and respective daily radiation as input data. The annual model (based on data collected on 45.8° northern latitude) of monthly mean hourly global solar radiation relative to the monthly mean daily radiation is found to be acceptable for latitudes between 40 and 50°N, if compared to other models. The same latitudinal validity is assumed for the annual models of diffuse and direct solar radiation. Similar models for other latitudes could be derived if representative pyrranometer data are available.

irradiance; local climate; stochastical model; sun flux

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