Title

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

Abstract

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. © 1994.

Publication Date

1-1-1994

Publication Title

Solar Energy

Volume

53

Issue

2

Number of Pages

177-185

Document Type

Article

Identifier

scopus

DOI Link

https://doi.org/10.1016/0038-092X(94)90479-0

Socpus ID

0028483596 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/0028483596

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