A new point of view on the relationship between global solar irradiation and sunshine quantifiers

作者：Brabec Marek; Badescu Viorel; Dumitrescu Alexandru; Paulescu Marius^*

来源：Solar Energy, 2016, 126: 252-263.

DOI：10.1016/j.solener.2016.01.009

• Global solar irradiation
• Sunshine quantifiers
• Sunshine number
• Angstrom equation
• Statistical modeling
• Regression analysis

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 sigma of 0 or 1 and manifests itself in clearness index jumps mainly at sigma = 0 rather than sigma = 1. The negative clearness index jump at sigma = 0 decreases while the slope of the relationship increases when the sunshine number is averaged over longer time periods.

• 出版日期2016-3