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Production of hot air with quasi uniform temperature using concentrated solar radiation

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  • Mahmoud, Ahmedou Ould Mohamed
  • Maad, Rejeb Ben
  • Belghith, Ali

Abstract

The design of a hot air solar generator for different uses has been simulated while investigating the flow induced by a hot disc placed at the entrance of the open ended vertical cylinder. Ambient air (Pr = 0.7) enters the bottom of the cylinder with constant velocity and temperature, and flows up through the cylinder as a result of natural convection. The cylindrical wall is heated by thermal radiation emitted by the disc. The pressure drop due to acceleration of the flow to the cylinder-inlet causes the appearance of thermosyphon effect around the thermal plume. At the top part of the cylinder, the flow exploration shows the full development of the turbulence and the uniformity of thermal and hydrodynamic fields. The study of the thermal spectral density indicates that the turbulent structures seem to be sufficiently small not to be sensitive to viscosity, but large enough to be sensitive to Archimedes effects.

Suggested Citation

  • Mahmoud, Ahmedou Ould Mohamed & Maad, Rejeb Ben & Belghith, Ali, 1998. "Production of hot air with quasi uniform temperature using concentrated solar radiation," Renewable Energy, Elsevier, vol. 13(4), pages 481-493.
    • Handle: RePEc:eee:renene:v:13:y:1998:i:4:p:481-493
    DOI: 10.1016/S0960-1481(98)00033-0
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    1. Maad, R.Ben & Belghith, A., 1992. "The use of grid-generated turbulence to improve heat transfer in passive solar systems," Renewable Energy, Elsevier, vol. 2(3), pages 333-336.
    2. Maad, Ben & Belghith, A., 1994. "The intensification of the heat transfer in passive solar systems using grid generated turbulence: Spectral study," Renewable Energy, Elsevier, vol. 4(3), pages 319-325.
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    Cited by:

    1. Ould Mohamed Mahmoud, Ahmedou & Zinoubi, Jamil & Ben Maad, Rejeb, 2007. "Study of hot air generator with quasi-uniform temperature using concentrated solar radiation: Influence of the shape parameters," Renewable Energy, Elsevier, vol. 32(2), pages 351-364.

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    1. Maad, Ben & Belghith, A., 1994. "The intensification of the heat transfer in passive solar systems using grid generated turbulence: Spectral study," Renewable Energy, Elsevier, vol. 4(3), pages 319-325.

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