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An experimental study on the evaluation of natural ventilation performance of a two-sided wind-catcher for various wind angles

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  • Afshin, M.
  • Sohankar, A.
  • Manshadi, M. Dehghan
  • Esfeh, M. Kazemi

Abstract

Natural ventilation performance of a two-sided wind-catcher is investigated for various wind angles (α = 0°–90°) and wind speeds by experimental wind tunnel and smoke flow visualization. A 1:50 scale model of a real wind-catcher in the city of Yazd (Iran) is employed. The pressure coefficient as well as velocity are measured by pressure taps and hot-wire anemometer, respectively. The hot-wire results are used to evaluate the induced airflow rate and turbulence intensity. Smoke flow visualization techniques are employed to study the flow structure and patterns inside and outside of the wind-catcher. The results indicate that the wind direction has a large influence on the wind-catcher performance and the induced airflow rate increases with increasing the wind speed. The hot-wire results show that the transition angles of the house window and windward opening for all wind speeds occur at the wind angles of 39° and 55°, respectively. An excellent agreement is also found for these transition angles when they are determined by measured pressure coefficients. Based on measured quantities, it is found that the wind-catcher acts as a chimney for the wind angle larger than the windward transition angle (α = 55°) and the highest ventilation rate occurs at the wind angle of 90°.

Suggested Citation

  • Afshin, M. & Sohankar, A. & Manshadi, M. Dehghan & Esfeh, M. Kazemi, 2016. "An experimental study on the evaluation of natural ventilation performance of a two-sided wind-catcher for various wind angles," Renewable Energy, Elsevier, vol. 85(C), pages 1068-1078.
    • Handle: RePEc:eee:renene:v:85:y:2016:i:c:p:1068-1078
    DOI: 10.1016/j.renene.2015.07.036
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    References listed on IDEAS

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    1. Bahadori, Mehdi N., 1994. "Viability of wind towers in achieving summer comfort in the hot arid regions of the middle east," Renewable Energy, Elsevier, vol. 5(5), pages 879-892.
    2. Montazeri, H. & Montazeri, F. & Azizian, R. & Mostafavi, S., 2010. "Two-sided wind catcher performance evaluation using experimental, numerical and analytical modeling," Renewable Energy, Elsevier, vol. 35(7), pages 1424-1435.
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    5. Calautit, John Kaiser & Hughes, Ben Richard & O’Connor, Dominic & Shahzad, Sally Salome, 2017. "Numerical and experimental analysis of a multi-directional wind tower integrated with vertically-arranged heat transfer devices (VHTD)," Applied Energy, Elsevier, vol. 185(P2), pages 1120-1135.
    6. Calautit, John Kaiser & O’Connor, Dominic & Tien, Paige Wenbin & Wei, Shuangyu & Pantua, Conrad Allan Jay & Hughes, Ben, 2020. "Development of a natural ventilation windcatcher with passive heat recovery wheel for mild-cold climates: CFD and experimental analysis," Renewable Energy, Elsevier, vol. 160(C), pages 465-482.
    7. Cuce, Erdem & Harjunowibowo, Dewanto & Cuce, Pinar Mert, 2016. "Renewable and sustainable energy saving strategies for greenhouse systems: A comprehensive review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 64(C), pages 34-59.
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