Optimum Tilt Angle at Tropical Region

S Soulayman; W Sabbagh

doi:10.14710/ijred.4.1.48-54

DOI: https://doi.org/10.14710/ijred.4.1.48-54

Optimum Tilt Angle at Tropical Region

S Soulayman¹ , W Sabbagh²

¹Higher Institute for Applied Sciences and Technology, Damascus P. O. Box 31983, Syrian Arab Republic

²National Energy Research Center, Damascus,, Syrian Arab Republic

Published: 15 Feb 2015.

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BibTex Citation Data :

@article{IJRED8187,
    author = {S Soulayman and W Sabbagh},
    title = {Optimum Tilt Angle at Tropical Region},
    journal = {International Journal of Renewable Energy Development},
  volume = {4},
    number = {1},
    year = {2015},
    keywords = {Optimum tilt, orientation, mathematical model, tropical region},
    abstract = { : One of the important parameters that affect the performance of a solar collector is its tilt angle with the horizon. This is because of the variation of tilt angle changes the amount of solar radiation reaching the collector surface. Meanwhile, is the rule of thumb, which says that solar collector Equator facing position is the best, is valid for tropical region? Thus, it is required to determine the optimum tilt as for Equator facing and for Pole oriented collectors. In addition, the question that may arise: how many times is reasonable for adjusting collector tilt angle for a definite value of surface azimuth angle? A mathematical model was used for estimating the solar radiation on a tilted surface, and to determine the optimum tilt angle and orientation (surface azimuth angle) for the solar collector at any latitude. This model was applied for determining optimum tilt angle and orientation in the tropical zones, on a daily basis, as well as for a specific period. The optimum angle was computed by searching for the values for which the radiation on the collector surface is a maximum for a particular day or a specific period. The results reveal that changing the tilt angle 12 times in a year (i.e. using the monthly optimum tilt angle) maintains approximately the total amount of solar radiation near the maximum value that is found by changing the tilt angle daily to its optimum value. This achieves a yearly gain in solar radiation of 11% to 18% more than the case of a solar collector fixed on a horizontal surface. },
   pages = {48--54}  doi = {10.14710/ijred.4.1.48-54},
    url = {https://ejournal.undip.ac.id/index.php/ijred/article/view/8187}
}

Citation Format:

Abstract

: One of the important parameters that affect the performance of a solar collector is its tilt angle with the horizon. This is because of the variation of tilt angle changes the amount of solar radiation reaching the collector surface. Meanwhile, is the rule of thumb, which says that solar collector Equator facing position is the best, is valid for tropical region? Thus, it is required to determine the optimum tilt as for Equator facing and for Pole oriented collectors. In addition, the question that may arise: how many times is reasonable for adjusting collector tilt angle for a definite value of surface azimuth angle? A mathematical model was used for estimating the solar radiation on a tilted surface, and to determine the optimum tilt angle and orientation (surface azimuth angle) for the solar collector at any latitude. This model was applied for determining optimum tilt angle and orientation in the tropical zones, on a daily basis, as well as for a specific period. The optimum angle was computed by searching for the values for which the radiation on the collector surface is a maximum for a particular day or a specific period. The results reveal that changing the tilt angle 12 times in a year (i.e. using the monthly optimum tilt angle) maintains approximately the total amount of solar radiation near the maximum value that is found by changing the tilt angle daily to its optimum value. This achieves a yearly gain in solar radiation of 11% to 18% more than the case of a solar collector fixed on a horizontal surface.

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Keywords: Optimum tilt, orientation, mathematical model, tropical region

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Section: Original Research Article

Language : EN

In Vol 4, No 1 (2015): February 2015

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Nijegorodov,N., Devan, K.R.S., Jain, P.K. (1997) Atmospheric transmittance models and an analytical method to predict the optimum slope on an absorber plate. Renewable Energy, 4, 525–530. http://dx.doi.org/10.1016/0960-1481(94)90215-1
Oko, C.O.C., Nnamchi, S.N. (2012) Optimum Collector Tilt Angles For Low Latitudes, The Open Renewable Energy Journal, 5, 7-14
Qiu, G., Riffat, S.B. (2003) Optimum tilt angle of solar collectors and its impact on performance. International Journal of Ambient Energy, 24, 13–20. http://dx.doi.org/10.1080/01430750.2003.9674898
Skeiker, K. (2009) Optimum tilt angle and orientation for solar collectors in Syria. Energy Conversion and Management 50, 2439–2448. http://dx.doi.org/10.1016/j.enconman.2009.05.031
Soulayman, S. (1991) On the optimum tilt of solar absorber plates. Renewable Energy, 1(3-4), 551-554. http://dx.doi.org/10.1016/0960-1481(91)90070-6
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Stanciu, C., Stanciu, D. (2014) Optimum tilt angle for flat plate collectors all over the World – A declination dependence formula and comparisons of three solar radiation models. Energy Conversion and Management 81, 133–143. doi: 10.1016/j.enconman.2014.02.016
Uba, F. A., Sarsah, E. A. (2013) Optimization of tilt angle for solar collectors in WA, Ghana. Pelagia Research Library, Advances in Applied Science Research, 4(4):108-114
Waziri, N. H., Usman, A. M., Enaburekhan, Babakano,J. S. A. (2014) Determination of Optimum Tilt Angle and Orientation of a Flat Plate Solar Collector for Different Periods in Kano. Scirj, 2, 2014 Edition, ISSN: 2201-2796

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Optimum Tilt Angle at Tropical Region

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