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Performance evaluation for solar collectors in Taiwan

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  • Chang, Tian Pau

Abstract

In this paper, the global irradiation observed in Taiwan from 1990 to 1999 was used to estimate the optimal tilt angle for solar collectors. The observed data are resolved into diffusion and beam components, and transformed into instantaneous time frames using mathematical models. The energy gain on installing a single-axis tracked panel as compared to a traditional fixed panel is originally analyzed theoretically. In addition to the observation data, both types of radiation will be taken into account for comparison, i.e. both extraterrestrial radiation and global radiation predicted using empirical models. The results show that the yearly optimal angles for six selected stations are about 0.95 and 0.88 times their latitudes for extraterrestrial and predicted radiation, respectively. All of the observed irradiations are less than the predicted values for all times and stations, consequently resulting in a flatter tilt angle, with a few exceptions in summer. Since Taipei has the lowest clearness index, its yearly optimal angle calculated from observed data shows the greatest discrepancy when compared to its latitude. By employing a tracked panel, the yearly gains calculated from the observed data lie between 14.3% and 25.3%, which is significantly less than those from the extraterrestrial and predicted radiations.

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  • Chang, Tian Pau, 2009. "Performance evaluation for solar collectors in Taiwan," Energy, Elsevier, vol. 34(1), pages 32-40.
    • Handle: RePEc:eee:energy:v:34:y:2009:i:1:p:32-40
    DOI: 10.1016/j.energy.2008.09.016
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    Cited by:

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    6. Chang, Tian Pau, 2009. "Output energy of a photovoltaic module mounted on a single-axis tracking system," Applied Energy, Elsevier, vol. 86(10), pages 2071-2078, October.
    7. Liu, Feng-Jiao & Chen, Pai-Hsun & Kuo, Shyi-Shiun & Su, De-Chuan & Chang, Tian-Pau & Yu, Yu-Hua & Lin, Tsung-Chi, 2011. "Wind characterization analysis incorporating genetic algorithm: A case study in Taiwan Strait," Energy, Elsevier, vol. 36(5), pages 2611-2619.
    8. Lee, M.C. & Kuo, C.H. & Wang, F.J., 2016. "Utilizing the building envelope for power generation and conservation," Energy, Elsevier, vol. 97(C), pages 1-10.
    9. Chang, Tian Pau, 2009. "Performance study on the east–west oriented single-axis tracked panel," Energy, Elsevier, vol. 34(10), pages 1530-1538.
    10. Maatallah, Taher & El Alimi, Souheil & Nassrallah, Sassi Ben, 2011. "Performance modeling and investigation of fixed, single and dual-axis tracking photovoltaic panel in Monastir city, Tunisia," Renewable and Sustainable Energy Reviews, Elsevier, vol. 15(8), pages 4053-4066.
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    12. Makhanlall, Deodat & Munda, Josiah L. & Jiang, Peixue, 2013. "Entropy generation in a solar collector filled with a radiative participating gas," Energy, Elsevier, vol. 60(C), pages 511-516.

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