Classification of the Sky in Shah Alam, Malaysia Using Measured Sky Radiance and Luminance

Abstract:

This study aims at classifying the sky at Shah Alam, Malaysia (3° 3.82´N, 101° 29.50´ E). Measurements of sky luminance and sky radiance were made at a chosen location in Shah Alam. The measurements were done by using a sky scanner. This equipment tracked 145 points of sky hemisphere. Field measurements were made during the periods of October to December 2010 and between January, July and August 2011. The luminance and radiance data were converted to illuminance and irradiance. The sky ratio and Perez clearness index were then calculated. It was confirmed that the sky at Shah Alam is mostly of the partly cloudy or intermediate type. During the measurement period, the maximum mean monthly hourly irradiation was more than 200 W/m2 and the maximum mean monthly hourly illuminance exceeded 20klux.

• Periodical: Applied Mechanics and Materials (Volumes 204-208)
• Pages: 2740-2743
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.204-208.2740
• Online since: October 2012
• Authors: Noorhasimah Yeop*, Azni Zain Ahmed
• Keywords: Illuminance, Irradiance, Perez Clearness Index, Sky Ratio

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