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Passive cooling by evapo-reflective roof for hot dry climates

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  • Ben Cheikh, Hamida
  • Bouchair, Ammar

Abstract

A dynamic mathematical model for an evapo-reflective roof to improve space cooling in buildings for hot arid climates has been developed. The proposed roof design is composed of a concrete ceiling over which lies a bed of rocks in a water pool. Over this bed is an air gap separated from the external environment by an aluminium plate. The upper surface of this plate is painted with a white titanium-based pigment to increase reflection of a radiation to a maximum during the day. At night, the temperature of the aluminium sheet falls below the temperature of the rock bed mixed with water. Water vapour inside the roof condenses and falls by gravity. This heat pipe effect carries heat outwards and cold inwards. Heat exchange is improved by radiation between two humid internal surfaces. The efficiency of this cooling system is studied using finite difference method. Numerical calculations performed for different external temperatures and solar radiation show that the cooling produced by such a system is significant. As a result of this, the mean air temperature in the room may be kept a few degrees above the minimum nocturnal outdoor temperature throughout the day. However, the maximum indoor air temperature was observed at sunset. This could further be lowered by allowing ventilation of the building in the evening. The work is continuing.

Suggested Citation

  • Ben Cheikh, Hamida & Bouchair, Ammar, 2004. "Passive cooling by evapo-reflective roof for hot dry climates," Renewable Energy, Elsevier, vol. 29(11), pages 1877-1886.
    • Handle: RePEc:eee:renene:v:29:y:2004:i:11:p:1877-1886
    DOI: 10.1016/j.renene.2003.12.021
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    References listed on IDEAS

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    1. Sodha, M.S. & Kumar, A. & Singh, U. & Tiwari, G.N., 1980. "Periodic theory of an open roof pond," Applied Energy, Elsevier, vol. 7(4), pages 305-319, December.
    2. Runsheng, Tang & Etzion, Y. & Erell, E., 2003. "Experimental studies on a novel roof pond configuration for the cooling of buildings," Renewable Energy, Elsevier, vol. 28(10), pages 1513-1522.
    3. Sodha, M.S. & Srivastava, A. & Kumar, A. & Tiwari, G.N., 1980. "Heating and cooling buildings by flow of water over the roof," Applied Energy, Elsevier, vol. 7(1-3), pages 229-242, November.
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    Cited by:

    1. Renata Rapisarda & Francesco Nocera & Vincenzo Costanzo & Gaetano Sciuto & Rosa Caponetto, 2022. "Hydroponic Green Roof Systems as an Alternative to Traditional Pond and Green Roofs: A Literature Review," Energies, MDPI, vol. 15(6), pages 1-27, March.
    2. Cuce, Pinar Mert & Riffat, Saffa, 2016. "A state of the art review of evaporative cooling systems for building applications," Renewable and Sustainable Energy Reviews, Elsevier, vol. 54(C), pages 1240-1249.
    3. Bouchahm, Yasmina & Bourbia, Fatiha & Belhamri, Azeddine, 2011. "Performance analysis and improvement of the use of wind tower in hot dry climate," Renewable Energy, Elsevier, vol. 36(3), pages 898-906.
    4. Sadineni, Suresh B. & Madala, Srikanth & Boehm, Robert F., 2011. "Passive building energy savings: A review of building envelope components," Renewable and Sustainable Energy Reviews, Elsevier, vol. 15(8), pages 3617-3631.
    5. Spanaki, Artemisia & Tsoutsos, Theocharis & Kolokotsa, Dionysia, 2011. "On the selection and design of the proper roof pond variant for passive cooling purposes," Renewable and Sustainable Energy Reviews, Elsevier, vol. 15(8), pages 3523-3533.
    6. Almodovar, José Manuel & La Roche, Pablo, 2019. "Roof ponds combined with a water-to-air heat exchanger as a passive cooling system: Experimental comparison of two system variants," Renewable Energy, Elsevier, vol. 141(C), pages 195-208.
    7. Sharifi, Ayyoob & Yamagata, Yoshiki, 2015. "Roof ponds as passive heating and cooling systems: A systematic review," Applied Energy, Elsevier, vol. 160(C), pages 336-357.
    8. Li, Y. & Arulnathan, V. & Heidari, M.D. & Pelletier, N., 2022. "Design considerations for net zero energy buildings for intensive, confined poultry production: A review of current insights, knowledge gaps, and future directions," Renewable and Sustainable Energy Reviews, Elsevier, vol. 154(C).
    9. Bouchair, Ammar, 2022. "The effect of the altitude on the performance of a solar chimney," Energy, Elsevier, vol. 249(C).
    10. Zeynab Emdadi & Nilofar Asim & Mohd Ambar Yarmo & Roslinda Shamsudin & Masita Mohammad & Kamaruzaman Sopian, 2016. "Green Material Prospects for Passive Evaporative Cooling Systems: Geopolymers," Energies, MDPI, vol. 9(8), pages 1-19, July.

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