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Optimal tilt-angles for solar collectors used in China

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  • Tang, Runsheng
  • Wu, Tong

Abstract

A reasonable estimation of the optimal tilt angle of a fixed collector for maximizing its energy collection must be done based on the monthly global and diffuse radiation on a horizontal surface. However, the monthly diffuse radiation is not always available in many places. In this paper, a simple mathematical procedure for the estimation of the optimal tilt angle of a collector is presented based on the monthly horizontal radiation. A comparison of the optimal tilt angles of collectors obtained from expected monthly diffuse radiation and that from the actual monthly diffuse radiation showed that this method gives a good estimation of the optimal tilt angle, except for places with a considerably lower clearness index. A contour map of the optimal tilt angle of the south-facing collectors used for the entire year in China is also outlined, based on monthly horizontal radiation of 152 places around the country, combing the optimal tilt angle of another 30 cities based on the actual monthly diffuse radiation.

Suggested Citation

  • Tang, Runsheng & Wu, Tong, 2004. "Optimal tilt-angles for solar collectors used in China," Applied Energy, Elsevier, vol. 79(3), pages 239-248, November.
    • Handle: RePEc:eee:appene:v:79:y:2004:i:3:p:239-248
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    References listed on IDEAS

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    1. Yakup, Mohd Azmi bin Hj Mohd & Malik, A.Q, 2001. "Optimum tilt angle and orientation for solar collector in Brunei Darussalam," Renewable Energy, Elsevier, vol. 24(2), pages 223-234.
    2. Lin, Wenxian, 1989. "Optimum inclinations of south-facing solar collectors during the heating season in China," Energy, Elsevier, vol. 14(3), pages 123-129.
    3. Ibrahim, D., 1995. "Optimum tilt angle for solar collectors used in Cyprus," Renewable Energy, Elsevier, vol. 6(7), pages 813-819.
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