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Technical Brief

Estimation and Applications of Clear Sky Global Horizontal Irradiance at the Equator

[+] Author and Article Information
Dazhi Yang

Solar Energy Research Institute of Singapore (SERIS),
National University of Singapore,
117574, Singapore
e-mail: seryangd@nus.edu.sg

Wilfred M. Walsh

Solar Energy Research Institute of Singapore (SERIS),
National University of Singapore,
117574, Singapore
e-mail: wwalsh@nus.edu.sg

Panida Jirutitijaroen

Assistant Professor
Department of Electrical and Computer Engineering,
National University of Singapore,
117583, Singapore
e-mail: elejp@nus.edu.sg

1Corresponding author.

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING. Manuscript received October 1, 2012; final manuscript received March 10, 2014; published online May 2, 2014. Assoc. Editor: Philippe Blanc.

J. Sol. Energy Eng 136(3), 034505 (May 02, 2014) (4 pages) Paper No: SOL-12-1258; doi: 10.1115/1.4027263 History: Received October 01, 2012; Revised March 10, 2014

We analyze Singapore global horizontal irradiance (GHI) measurements and propose a clear sky GHI model for equatorial regions. The empirical formulation simplifies the atmosphere radiative transfer to a single exponential term. The results are benchmarked using locally collected data. Two applications of the clear sky model are briefly discussed.

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Figures

Grahic Jump Location
Fig. 1

Performance of the modified clear sky model for all clear sky situations at SERIS during year 2012. A root-mean-square error of 41.9 W/m2 is found.

Grahic Jump Location
Fig. 2

Performance of the modified clear sky model on 11 best clear sky ds during years 2011 to 2013 benchmarked with 5 min SERIS data. The dotted line gives the maximum value of modeled clear sky GHI.

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