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The influence of wind speed, aperture ratio and tilt angle on the heat losses from a finely controlled heated cavity for a solar receiver

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  • Lee, Ka Lok
  • Chinnici, Alfonso
  • Jafarian, Mehdi
  • Arjomandi, Maziar
  • Dally, Bassam
  • Nathan, Graham

Abstract

The first systematic experimental study of the combined influences of wind speed (0–9 m/s), aperture ratio (0.33–1) and tilt angle (15°–45°) on the mixed (free and forced) convective heat losses from a heated cavity, is presented. The cylindrical cavity is heated by 16 individually temperature-controlled heating elements in the open section of a wind tunnel. Heat flux distribution and total heat losses from the cavity were measured. A complex inter-dependence was found between aperture ratio, wind speed and convective heat losses. In particular, the total heat losses can vary by up to ∼75% by varying the aperture ratio from 0.33 to 0.75, for no wind condition, but the effect of aperture ratio is decreased as wind speed is increased. The tilt angle was found to have a small effect on the heat losses relative to the aperture ratio and wind speed. Nevertheless, the average minimum mixed heat loss for various wind speeds occurs for a tilt angle of between 15° and 30° for a downward tilting solar tower system.

Suggested Citation

  • Lee, Ka Lok & Chinnici, Alfonso & Jafarian, Mehdi & Arjomandi, Maziar & Dally, Bassam & Nathan, Graham, 2019. "The influence of wind speed, aperture ratio and tilt angle on the heat losses from a finely controlled heated cavity for a solar receiver," Renewable Energy, Elsevier, vol. 143(C), pages 1544-1553.
    • Handle: RePEc:eee:renene:v:143:y:2019:i:c:p:1544-1553
    DOI: 10.1016/j.renene.2019.05.015
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    Cited by:

    1. Lee, Leok & Ingenhoven, Philip & Saw, Woei L. & Nathan, Graham J ‘Gus’, 2024. "The techno-economics of transmitting heat at high temperatures in insulated pipes over large distances," Applied Energy, Elsevier, vol. 358(C).
    2. Strušnik, Dušan & Brandl, Daniel & Schober, Helmut & Ferčec, Janko & Avsec, Jurij, 2020. "A simulation model of the application of the solar STAF panel heat transfer and noise reduction with and without a transparent plate: A renewable energy review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 134(C).
    3. Yandong, Hou & Qingbai, Wu & Kaige, Wang & Zeguo, Ye, 2020. "Numerical evaluation for protecting and reinforcing effect of a new designed crushed rock revetment on Qinghai–Tibet Railway," Renewable Energy, Elsevier, vol. 156(C), pages 645-654.

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