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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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    13. Kabeel, A.E. & Khalil, A. & Elsayed, S.S. & Alatyar, A.M., 2015. "Modified mathematical model for evaluating the performance of water-in-glass evacuated tube solar collector considering tube shading effect," Energy, Elsevier, vol. 89(C), pages 24-34.
    14. Zhijian Liu & Hao Li & Xinyu Zhang & Guangya Jin & Kewei Cheng, 2015. "Novel Method for Measuring the Heat Collection Rate and Heat Loss Coefficient of Water-in-Glass Evacuated Tube Solar Water Heaters Based on Artificial Neural Networks and Support Vector Machine," Energies, MDPI, vol. 8(8), pages 1-21, August.
    15. Sabiha, M.A. & Saidur, R. & Mekhilef, Saad & Mahian, Omid, 2015. "Progress and latest developments of evacuated tube solar collectors," Renewable and Sustainable Energy Reviews, Elsevier, vol. 51(C), pages 1038-1054.
    16. Huang, Jinbao & Pu, Shaoxuan & Gao, Wenfeng & Que, Yi, 2010. "Experimental investigation on thermal performance of thermosyphon flat-plate solar water heater with a mantle heat exchanger," Energy, Elsevier, vol. 35(9), pages 3563-3568.
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    19. Hafez, A.Z. & Soliman, A. & El-Metwally, K.A. & Ismail, I.M., 2017. "Tilt and azimuth angles in solar energy applications – A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 77(C), pages 147-168.
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