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Wind energy and natural ventilation potential of a wind catcher in Yazd – Iran (a long-term measurement)

Hedayat, Zhaleh, Belmans, Bert, Ayatollahi, M. Hossein, Wouters, Ine, Descamps, Filip
International journal of green energy 2017 v.14 no.7 pp. 650-655
air flow, buildings, energy efficiency, monitoring, natural ventilation, wind direction, wind power, wind speed, Iran
When designing energy efficient buildings it is useful to study existing climate—responsive building typologies. The wind towers or wind-catchers of Yazd city in Iran are typical examples of such a typology. Although many previous studies have investigated the performance of various types of wind catcher systems, studies based on a long-term real-life measurement can be rarely found. In this study a long-term whole year monitoring campaign on an existing full scale four sided wind catcher in Yazd was carried out in 2014–2015. Three prevailing wind directions were identified and the measured on-site wind speeds were used to estimate the wind induced natural ventilation potential of the tower. A shaft/tower airflow performance index was developed. The monitoring results were compared to the ASHRAE Standard 62:2001 ventilation rate requirement. Results show that the total ventilation rate of the wind tower surpasses the ASHRAE Standard requirements. Furthermore it shows that the shafts are exposed to the prevailing wind directions perform better. For more effective natural ventilation a wind tower with adaptable openings/shafts are proposed.