Measurement and modeling of solar irradiance components on horizontal and tilted planes

Journal Article · Wed Dec 15 04:00:00 EST 2010 · Solar Energy

DOI:https://doi.org/10.1016/J.SOLENER.2010.09.009· OSTI ID:21396181

Padovan, Andrea; Col, Davide del ^[1]

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1. Dipartimento di Fisica Tecnica, Universita degli Studi di Padova (Italy)

In this work new measurements of global and diffuse solar irradiance on the horizontal plane and global irradiance on planes tilted at 20 and 30 oriented due South and at 45 and 65 oriented due East are used to discuss the modeling of solar radiation. Irradiance data are collected in Padova (45.4 N, 11.9 E, 12 m above sea level), Italy. Some diffuse fraction correlations have been selected to model the hourly diffuse radiation on the horizontal plane. The comparison with the present experimental data shows that their prediction accuracy strongly depends on the sky characteristics. The hourly irradiance measurements taken on the tilted planes are compared with the estimations given by one isotropic and three anisotropic transposition models. The use of an anisotropic model, based on a physical description of the diffuse radiation, provides a much better accuracy, especially when measurements of the diffuse irradiance on the horizontal plane are not available and thus transposition models have to be applied in combination with a diffuse fraction correlation. This is particularly significant for the planes oriented away from South. (author)

• OSTI ID: 21396181
• Journal Information: Solar Energy, Journal Name: Solar Energy Journal Issue: 12 Vol. 84; ISSN 0038-092X; ISSN SRENA4
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
ACCURACY
ANISOTROPY
COMPARATIVE EVALUATIONS
CORRELATIONS
DIFFUSE SOLAR RADIATION
EXPERIMENTAL DATA
ITALY
RADIANT FLUX DENSITY
SIMULATION
SKY
SOLAR RADIATION
Tilted planes