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Optimal tilt-angles of all-glass evacuated tube solar collectors

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  • Tang, Runsheng
  • Gao, Wenfeng
  • Yu, Yamei
  • Chen, Hua

Abstract

In this paper, a detailed mathematical procedure is developed to estimate daily collectible radiation on single tube of all-glass evacuated tube solar collectors based on solar geometry, knowledge of two-dimensional radiation transfer. Results shows that the annual collectible radiation on a tube is affected by many factors such as collector type, central distance between tubes, size of solar tubes, tilt and azimuth angles, use of diffuse flat reflector (DFR, in short); For collectors with identical parameters, T-type collectors (collectors with solar tubes tilt-arranged) annually collect slightly more radiation than H-type collectors (those with solar tubes horizontally arranged) do. The use of DFR can significantly improve the energy collection of collectors. Unlike the flat-plate collectors, all-glass evacuated tube solar collectors should be generally mounted with a tilt-angle less than the site latitude in order to maximize the annual energy collection. For most areas with the site latitude larger than 30° in China, T-type collectors should be installed with a tilt-angle about 10° less than the site latitude, whereas for H-type collectors without DFR, the reasonable tilt-angle should be about 20° less than the site latitude. Effects of some parameters on the annual collectible radiation on the collectors are also presented.

Suggested Citation

  • Tang, Runsheng & Gao, Wenfeng & Yu, Yamei & Chen, Hua, 2009. "Optimal tilt-angles of all-glass evacuated tube solar collectors," Energy, Elsevier, vol. 34(9), pages 1387-1395.
    • Handle: RePEc:eee:energy:v:34:y:2009:i:9:p:1387-1395
    DOI: 10.1016/j.energy.2009.06.014
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    References listed on IDEAS

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    1. Xiao, Chaofeng & Luo, Huilong & Tang, Runsheng & Zhong, Hao, 2004. "Solar thermal utilization in China," Renewable Energy, Elsevier, vol. 29(9), pages 1549-1556.
    2. Tang, Runsheng & Wu, Tong, 2004. "Optimal tilt-angles for solar collectors used in China," Applied Energy, Elsevier, vol. 79(3), pages 239-248, November.
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