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An investigation of possible improvements in accuracy of regressions between diffuse and global solar irradiation.

Clarke, Peter, Munawwar, Saima, Davidson, Alan, Muneer, Tariq and Kubie, Jorge (2007) An investigation of possible improvements in accuracy of regressions between diffuse and global solar irradiation. Building Service Engineering Research and Technology, 28 (2). pp. 189-197. ISSN 01436244

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Abstract/Description

Horizontal hourly and sub-hourly diffuse and beam irradiance are required for the estimation of global irradiance on a given tilted surface. This information is used by engineers and architects for various solar energy applications and also to calculate solar heat gain in
buildings. Although horizontal global irradiance is a commonly measured parameter for many sites, horizontal diffuse irradiance is not so readily obtainable. For such sites that measure global irradiation alone a simple but reasonably accurate method is required to estimate diffuse irradiance from its global counterpart. The aim of this study is to evaluate the accuracies of estimation of diffuse irradiance by developing annual, seasonal and
monthly regressions between sub-hourly diffuse-ratio and clearness-index. An error analysis has been undertaken to compare these regression models.

Practical applications: Diffuse and beam components of global irradiation are required to accurately simulate solar heat gain in buildings. The UK Meteorological office keeps records of diffuse and global irradiances for 9 stations, but there are a further 84 stations that solely record global irradiance. Hence there is a need to estimate diffuse or beam irradiance for these sites. This paper presents an investigation into the uses of annual, seasonal and monthly regressions between diffuse and global horizontal sub-hourly solar irradiation. These regressions have proven to be a simple but reasonably accurate method of estimating diffuse irradiance from its global counterpart.

Item Type: Article
Print ISSN: 01436244
Uncontrolled Keywords: Global irradiance; Correlation; Measures; Diffuse irradiance; Clearness ratio; Estimation of diffuse from global irradiation;
University Divisions/Research Centres: Faculty of Engineering, Computing and Creative Industries > School of Engineering and the Built Environment
Dewey Decimal Subjects: 600 Technology > 690 Building & construction > 697 Heating, ventilating & air-conditioning
600 Technology > 620 Engineering > 621 Electronic & mechanical engineering
500 Science > 550 Earth sciences & geology
Library of Congress Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Q Science > QC Physics
Item ID: 2011
Depositing User: RAE Import
Date Deposited: 18 Mar 2008 17:13
Last Modified: 19 Feb 2013 13:56
URI: http://researchrepository.napier.ac.uk/id/eprint/2011

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