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Sonic Anemometry to Measure Natural Ventilation in Greenhouses
Department of Rural Engineering, University of Almería, Ctra. Sacramento s/n, 04120 Almería, Spain
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Received: 19 September 2011; in revised form: 14 October 2011 / Accepted: 14 October 2011 / Published: 19 October 2011
Abstract: The present work has developed a methodology for studying natural ventilation in Mediterranean greenhouses by means of sonic anemometry. In addition, specific calculation programmes have been designed to enable processing and analysis of the data recorded during the experiments. Sonic anemometry allows us to study the direction of the airflow at all the greenhouse vents. Knowing through which vents the air enters and leaves the greenhouse enables us to establish the airflow pattern of the greenhouse under natural ventilation conditions. In the greenhouse analysed in this work for Poniente wind (from the southwest), a roof vent designed to open towards the North (leeward) could allow a positive interaction between the wind and stack effects, improving the ventilation capacity of the greenhouse. The cooling effect produced by the mass of turbulent air oscillating between inside and outside the greenhouse at the side vents was limited to 2% (for high wind speed, uo ≥ 4 m s−1) reaching 36.3% when wind speed was lower (uo = 2 m s−1).
Keywords: sonic anemometry; greenhouse; ventilation; insect-proof screens
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MDPI and ACS Style
López, A.; Valera, D.L.; Molina-Aiz, F. Sonic Anemometry to Measure Natural Ventilation in Greenhouses. Sensors 2011, 11, 9820-9838.
López A, Valera DL, Molina-Aiz F. Sonic Anemometry to Measure Natural Ventilation in Greenhouses. Sensors. 2011; 11(10):9820-9838.
López, Alejandro; Valera, Diego Luis; Molina-Aiz, Francisco. 2011. "Sonic Anemometry to Measure Natural Ventilation in Greenhouses." Sensors 11, no. 10: 9820-9838.