Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1549531 | Solar Energy | 2016 | 12 Pages |
Abstract
The relationship between the clearness index and the time averaged sunshine number is studied over short time intervals such as one hour. Several non-linear statistical models have been used. Meteorological and radiometric data from various weather stations of Romania (South-Eastern Europe) are analyzed. Nonlinearity of the relationship is only apparent near the boundary for relative sunshine Ï of 0 or 1 and manifests itself in clearness index jumps mainly at ÏÂ =Â 0 rather than ÏÂ =Â 1. The negative clearness index jump at ÏÂ =Â 0 decreases while the slope of the relationship increases when the sunshine number is averaged over longer time periods.
Related Topics
Physical Sciences and Engineering
Energy
Renewable Energy, Sustainability and the Environment
Authors
Marek Brabec, Viorel Badescu, Alexandru Dumitrescu, Marius Paulescu,