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Thermal behavior of curved roof buildings exposed to solar radiation and wind flow for various orientations

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  • Hadavand, M.
  • Yaghoubi, M.

Abstract

In this study air flow, solar radiation and heat transfer from a two dimensional curved roof with north-south and east-west faced are determined and results are compared with flat roof for the same size and orientation. Comparison are performed for their corresponding roof surface temperature, and heat flow for several roof rim angles and also for various wind flow velocities, as well as for different wind directions. Turbulence is modeled by RNG k-[epsilon]method and solar radiation distribution over the roof is determined based on an appropriate model applicable to hot arid regions of Iran. Solar radiation is calculated based on the summation of beam and diffuse radiation and ground reflected radiation. For certain inside roof temperature, over all heat transfer to the building is determined with day time for various wind flows and arc shapes and results are compared with flat roof. It was found that various wind flow condition over the vaulted roof makes substantial difference on the convection heat transfer coefficient and finally on the rate of heat transfer to the building with respect to flat roof. Based on heat transfer simulation, roof temperature, heat transfer convection coefficient and heat flow though the vault for different roof arrangement and flat roofs have been determined and advantages of specific vault orientation and wind direction are specified.

Suggested Citation

  • Hadavand, M. & Yaghoubi, M., 2008. "Thermal behavior of curved roof buildings exposed to solar radiation and wind flow for various orientations," Applied Energy, Elsevier, vol. 85(8), pages 663-679, August.
    • Handle: RePEc:eee:appene:v:85:y:2008:i:8:p:663-679
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    References listed on IDEAS

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    1. Gadi, Mohamed B., 2000. "Design and simulation of a new energy-conscious system (CFD and solar simulation)," Applied Energy, Elsevier, vol. 65(1-4), pages 251-256, April.
    2. Yaghoubi, M.A., 1991. "Air flow patterns around domed roof buildings," Renewable Energy, Elsevier, vol. 1(3), pages 345-350.
    3. Gadi, Mohamed B., 2000. "Design and simulation of a new energy conscious system, (basic concept)," Applied Energy, Elsevier, vol. 65(1-4), pages 349-353, April.
    4. Gadi, Mohamed B., 2000. "Design and simulation of a new energy conscious system, (ventilation and thermal performance simulation)," Applied Energy, Elsevier, vol. 65(1-4), pages 355-366, April.
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    Cited by:

    1. Shaeri, M.R. & Yaghoubi, M. & Jafarpur, K., 2009. "Heat transfer analysis of lateral perforated fin heat sinks," Applied Energy, Elsevier, vol. 86(10), pages 2019-2029, October.
    2. Chel, Arvind & Tiwari, G.N., 2009. "Thermal performance and embodied energy analysis of a passive house - Case study of vault roof mud-house in India," Applied Energy, Elsevier, vol. 86(10), pages 1956-1969, October.
    3. Elnokaly, Amira & Ayoub, Mohammed & Elseragy, Ahmed, 2019. "Parametric investigation of traditional vaulted roofs in hot-arid climates," Renewable Energy, Elsevier, vol. 138(C), pages 250-262.
    4. Wael Seddik Moustafa & Ibrahim Rizk Hegazy & Mohammed Moustafa Eldabousy, 2018. "Roof geometry as a factor of thermal behavior: simulation based study of using vaults and domes in the Middle East zone," International Journal of Low-Carbon Technologies, Oxford University Press, vol. 13(3), pages 204-211.

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