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International Journal of Photoenergy
Volume 2013, Article ID 820714, 13 pages
Research Article

Performance of Dual-Axis Solar Tracker versus Static Solar System by Segmented Clearness Index in Malaysia

1UM Power Energy Dedicated Advanced Centre (UMPEDAC), University of Malaya, 59990 Kuala Lumpur, Malaysia
2Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia
3King Abdulaziz University, Jeddah 21589, Saudi Arabia

Received 17 July 2013; Accepted 21 October 2013

Academic Editor: Mahmoud M. El-Nahass

Copyright © 2013 Jhee Fhong Lee et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The performance of Dual-Axis Solar Tracker (DAST) and Static Solar System (SSS) with respect to clearness index in Malaysia is presented. An attempt to investigate the correlation between clearness index with energy gain and efficiency of DAST over SSS is being done experimentally. A good correlation could not be found out from the daily clearness index. It is due to the more profound advantage of DAST in the morning and evening compared to midday as it is able to follow the sun’s position. Hence, the daily clearness index is divided into three segments which are morning, midday, and evening to interpret the energy gain and efficiency better. A clearer correlation with low standard deviation can be observed on the segmented clearness index analysis. The energy gain and efficiency of seven cities in Malaysia is being estimated with the segmented clearness index and compared to the result generated from anisotropic radiation model. A similar trend is obtained and it has shown that the segmented clearness index could be utilized as a graphical method for estimation of energy gain and efficiency of DAST over SSS.