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A new method for correcting shadow band diffuse irradiance data.

Muneer, Tariq and Zhang, Xiaodong (2002) A new method for correcting shadow band diffuse irradiance data. ASME Journal of Solar Energy Engineering, 124 (1). pp. 34-43. ISSN 0199 6231

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Abstract/Description

An instrument commonly used to measure diffuse irradiance is the polar-axis shadow band pyranometer. However, the shadow band that is used to prevent the beam energy from entering the pyranometer also obscures part of sky-diffuse irradiance. A correction factor must hence be applied to obtain as accurate as possible the estimation of the true diffuse irradiance. In this article, the development of a new model based on an anisotropic sky-diffuse distribution theory is presented. The proposed model is validated using two databases from different sites with various sky conditions. Drummond's method, which is based on geometrical calculation, is also examined using the same databases. Comparison of the results obtained through application of the proposed model, with those generated by Drummond's method shows that, for the case of Bracknell, UK the proposed method gives a root mean square error (RMSE) of 12 W/m2, as compared to Drummond's figure of 16 W/m2. For the case of Beer Sheva, Israel the proposed model produces an RMSE of 17 W/m2, while Drummond's procedure results in 23 W/m2. It has been demonstrated herein that the proposed method is not site specific.

Item Type: Article
Print ISSN: 0199 6231
Electronic ISSN: 1528-8986
Uncontrolled Keywords: Solar energy; Diffuse irradiance; Measurement; Shadow band Pyranometer; Anisotropic sky-diffusion theory; Case studies; Databases; Mathematical models; Comparison; Drummond's geometric irradiance calculation; Anisotropic diffusion method; Accuracy evaluations;
University Divisions/Research Centres: Faculty of Engineering, Computing and Creative Industries > School of Engineering and the Built Environment
Dewey Decimal Subjects: 600 Technology > 620 Engineering > 621 Electronic & mechanical engineering
500 Science > 510 Mathematics > 510 Mathematics
Library of Congress Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Q Science > QA Mathematics
Item ID: 1880
Depositing User: RAE Import
Date Deposited: 27 May 2008 16:40
Last Modified: 05 Jul 2013 14:50
URI: http://researchrepository.napier.ac.uk/id/eprint/1880

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