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Natural convection heat loss estimation of solar cavity receiver by incorporating a modified aperture ratio

Natural convection heat loss estimation of solar cavity receiver by incorporating a modified aperture ratio

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  • Author(s): L. Xiao 1, 2 ; S.-Y. Wu 1, 2 ; Y.-R. Li 1, 2
    • View affiliations
    • Affiliations: 1: Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education, Chongqing University, Chongqing, People's Republic of China
      2: College of Power Engineering, Chongqing University, Chongqing, People's Republic of China
  • Source: Volume 6, Issue 2, March 2012, p. 122 – 128
    DOI:  10.1049/iet-rpg.2011.0133 , Print ISSN 1752-1416, Online ISSN 1752-1424
© The Institution of Engineering and Technology
Published

On the basis of the consideration of air property variation with temperature, a three-dimensional (3-D) numerical investigation has been performed to attain insight into the cavity aspect ratio on the natural convection heat loss of a cavity receiver for a high-temperature solar dish system. Temperature and velocity contours as well as the variation curves have shown that the expansion of convection zone together with the augmentation of velocity magnitude is mainly responsible for the increase in natural convection heat loss with decreasing cavity aspect ratio, that is, shallower cavity. Moreover, the dependency of natural convection heat loss on the cavity aspect ratio is related to the tilt angle. Also, a modified definition of aperture ratio has been introduced, aiming to reflect the combined impact of the cavity aspect ratio and aperture size. Finally, two correlations of Nusselt number have been proposed by incorporating the cavity aspect ratio and the newly defined modified aperture ratio, respectively.

Inspec keywords: solar power stations; thermal power stations; heat losses; numerical analysis; natural convection

Other keywords: modified aperture ratio; velocity magnitude augmentation; tilt angle; air property variation curve; solar cavity receiver; natural convection heat loss estimation; three-dimensional numerical investigation; convection zone expansion; cavity aspect ratio; Nusselt number; high-temperature solar dish system; 3D numerical investigation; sun-tracking paraboloidal dish solar thermal power system

Subjects: Heat and thermodynamic processes (mechanical engineering); Power and plant engineering (mechanical engineering); Other numerical methods; Numerical analysis; Solar power stations and photovoltaic power systems; Thermal power stations and plants

References

    1. 1)
      • S. Patankar . (1980) Numerical heat transfer and fluid flow.
    2. 2)
    3. 3)
    4. 4)
    5. 5)
    6. 6)
    7. 7)
      • Paitoonsurikarn, S., Lovegrove, K.: `On the study of convection loss from open cavity receivers in solar paraboloidal dish applications', Proc. 41st Conf. Australia and New Zealand Solar Energy Society (ANZSES), 2003, Melbourne, Australia.
    8. 8)
      • J.T.F. Irvine , P.E. Liley . (1984) Steam and gas tables with computer equations.
    9. 9)
      • Paitoonsurikarn, S., Taumoefolau, T., Lovegrove, K.: `Estimation of convection loss from paraboloidal dish cavity receivers', Proc. 42nd Conf. Australia and New Zealand Solar Energy Society (ANZSES), 2004, Perth, Australia.
    10. 10)
    11. 11)
    12. 12)
      • Le Quere, P., Penot, F., Mirenayat, M.: `Experimental study of heat loss through natural convection from an isothermal cubic open cavity', SAND81-8014, Sandia National Laboratories Report, 1981.
    13. 13)
    14. 14)
    15. 15)
      • Stine, W.B., McDonald, C.G.: `Cavity receiver convective heat loss', Proc. Int. Solar Energy Society (ISES) Solar World Conf., 1989, Kobe, Japan.
    16. 16)
    17. 17)
      • Paitoonsurikarn, S., Lovegrove, K.: `A new correlation for predicting the free convection loss from solar dish concentrating receivers', Proc. 44th Conf. Australia and New Zealand Solar Energy Society (ANZSES), 2006, Canberra, Australia.
    18. 18)
    19. 19)
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