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.
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e-mail: t.muneer@napier.ac.uk
e-mail: xd.zhang@napier.ac.uk
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February 2002
Technical Papers
A New Method for Correcting Shadow Band Diffuse Irradiance Data
T. Muneer,
e-mail: t.muneer@napier.ac.uk
T. Muneer
School of Engineering, Napier University, 10 Colinton Road, Edinburgh EH10 5DT, UK
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X. Zhang
e-mail: xd.zhang@napier.ac.uk
X. Zhang
School of Engineering, Napier University, 10 Colinton Road, Edinburgh EH10 5DT, UK
Search for other works by this author on:
T. Muneer
School of Engineering, Napier University, 10 Colinton Road, Edinburgh EH10 5DT, UK
e-mail: t.muneer@napier.ac.uk
X. Zhang
School of Engineering, Napier University, 10 Colinton Road, Edinburgh EH10 5DT, UK
e-mail: xd.zhang@napier.ac.uk
Contributed by the Solar Energy Division of the American Society of Mechanical Engineers for publication in the ASME JOURNAL OF SOLAR ENERGY ENGINEERING. Manuscript received by the ASME Solar Energy Division, Oct. 2000; final revision Mar. 2001. Associate Editor: A. Walker.
J. Sol. Energy Eng. Feb 2002, 124(1): 34-43 (10 pages)
Published Online: March 1, 2001
Article history
Received:
October 1, 2000
Revised:
March 1, 2001
Citation
Muneer, T., and Zhang, X. (March 1, 2001). "A New Method for Correcting Shadow Band Diffuse Irradiance Data ." ASME. J. Sol. Energy Eng. February 2002; 124(1): 34–43. https://doi.org/10.1115/1.1435647
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