Measurements and models for total solar irradiance on inclined surface in Athens, Greece

Journal Article · Mon Aug 01 00:00:00 EDT 1994 · Solar Energy (Journal of Solar Energy Science and Engineering); (United States)

DOI:https://doi.org/10.1016/0038-092X(94)90479-0· OSTI ID:6811243

Kambezidis, H D; Psiloglou, B E ^[1]; Gueymard, C ^[2]

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1. Institute of Meteorology and Physics of the Atmospheric Environment, Athens (Greece)
2. Florida Solar Energy Center, Cape Canaveral, FL (United States)

This article presents a comparative assessment of tilted irradiation models, using hourly measurements of total solar irradiation on a surface tilted 50 degrees and oriented south in Athens. Detailed measurements on inclined surfaces are carried out at the National Observatory of Athens and are unique in Greece. Twelve sky diffuse submodels are used with four albedo submodels to estimate the global irradiation on the tilted surface from data on the horizontal plane. Root mean square errors (rmse) and mean bias errors (mbe) are used to determine the intrinsic performance of each diffuse tilt/albedo submodel combination. GUEYMARD, HAY, REINDL, and SKARTVEIT-OLSETH diffuse tilt submodels are found to have the best overall performances, in conjunction with either one of three albedo submodels (constant albedo, seasonally varying albedo, and anisotropic albedo). The PEREZ model's performance was below expectations, probably due to the particular atmospheric environment of Athens. The anisotropic and seasonally varying albedo submodels do not improve the performance of the four better diffuse tilt models (compared to their performance using an albedo fixed at 0.2) for the moderately tilted surface investigated in this article.

• OSTI ID: 6811243
• Journal Information: Solar Energy (Journal of Solar Energy Science and Engineering); (United States), Vol. 53:2; ISSN 0038-092X
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
DIFFUSE SOLAR RADIATION
MATHEMATICAL MODELS
PREDICTION EQUATIONS
SURFACES
INCLINATION
ALBEDO
COMPARATIVE EVALUATIONS
EQUATIONS
EVALUATION
RADIATIONS
SOLAR FLUX
SOLAR RADIATION
STELLAR RADIATION
140100* - Solar Energy- Resources & Availability
990200 - Mathematics & Computers