淡江大學機構典藏:Item 987654321/124441
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    题名: Experimental study on air extraction performance of novel rooftop natural ventilators
    作者: Ouyang, Kwan
    关键词: Rooftop natural ventilator;turbine ventilator;static ventilator;wind turbine;wind tunnel test
    日期: 2023-08-30
    上传时间: 2023-09-04 12:05:10 (UTC+8)
    出版者: Taylor & Francis
    摘要: The air extraction performance of novel rooftop natural ventilators was experimentally investigated and compared to the conventional turbine ventilator. The newly developed ventilator integrates a vertical-axis wind turbine with a static ventilator, where the wind turbine, equipped with 8 C-type rotors and 6 rotor guide vanes, serves to drive the rotation of the static ventilator. The static ventilator is an exhaust cowl with curved guide vanes inside. The wind turbine, including 8 C-rotors and 6 flat guide vanes, is 10 cm in height with a diameter of 21 cm. The dimensions of static ventilation are 7 cm in height, and 26 cm and 21 cm in bottom and top diameters, respectively, with curved guide vanes inside. Various heights of guide vanes (0.5 cm and 3 cm) and numbers of guide vanes (0, 6, and 12) were investigated. An open wind tunnel system was used to simulate the condition where the wind blows over the rooftop ventilator. The ventilator air extraction rates were determined using the mean air velocities, measured using a hot-wire anemometer at an open slot in a ventilation pipe connected to the ventilator. The results indicated that the rotating and non-rotating novel ventilators exhibited superior air extraction rates at most tested wind speeds compared to the rotating conventional turbine ventilator. The curved guide vanes inside the static ventilator played the most important role in the air extraction rate. This study suggests that a static ventilator with an adequate guide-vane design may be more suitable for rooftop ventilation than a conventional turbine ventilator.
    關聯: International Journal of Ventilation
    DOI: 10.1080/14733315.2023.2251316
    显示于类别:[航空太空工程學系暨研究所] 期刊論文

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