IDEAS home Printed from https://ideas.repec.org/a/eee/renene/v2y1992i3p333-336.html
   My bibliography  Save this article

The use of grid-generated turbulence to improve heat transfer in passive solar systems

Author

Listed:
  • Maad, R.Ben
  • Belghith, A.

Abstract

In order to design and realize a solar chimney of greatest efficiency for drying agricultural products, we have investigated the natural convective flow between two heated vertical plates. The equations of continuity, momentum and energy are solved by a finite difference method, taking into account the variation of the fluid properties with temperature and the pressure drop due to flow acceleration at the channel entrance. In order to validate the theoretical predictions, an experimental study was carried out. Good agreement between the experimental results and the theoretical predictions was obtained. The average Nusselt number at the exit was calculated. This value is comparable to that obtained on a flat plate, despite the thermosyphon effect. In order to improve the heat transfer in the channel, grid-generated turbulence was used. The experimental results show that flow was no longer laminar; the hydrodynamic and thermal fields become very unstable. The temperature in the middle of the channel is high and can reach 50% of the wall temperature. In spite of the decrease of the volumetric air flow, the average Nusselt number increases according to the quality of grid arrangements.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:renene:v:2:y:1992:i:3:p:333-336
    DOI: 10.1016/0960-1481(92)90046-6
    as

    Download full text from publisher

    File URL: http://www.sciencedirect.com/science/article/pii/0960148192900466
    Download Restriction: Full text for ScienceDirect subscribers only
    File URL: https://libkey.io/10.1016/0960-1481(92)90046-6?utm_source=ideas
    LibKey link: if access is restricted and if your library uses this service, LibKey will redirect you to where you can use your library subscription to access this item
    ---><---

    As the access to this document is restricted, you may want to search for a different version of it.

    Citations

    Citations are extracted by the CitEc Project, subscribe to its RSS feed for this item.
    as


    Cited by:

    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.
    2. 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.

    More about this item

    Statistics

    Access and download statistics

    Corrections

    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:eee:renene:v:2:y:1992:i:3:p:333-336. See general information about how to correct material in RePEc.

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    We have no bibliographic references for this item. You can help adding them by using this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: Catherine Liu (email available below). General contact details of provider: http://www.journals.elsevier.com/renewable-energy .

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service. RePEc uses bibliographic data supplied by the respective publishers.