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Sensors 2011, 11(10), 9820-9838; doi:10.3390/s111009820
Article

Sonic Anemometry to Measure Natural Ventilation in Greenhouses

,
*  and
Department of Rural Engineering, University of Almería, Ctra. Sacramento s/n, 04120 Almería, Spain
* Author to whom correspondence should be addressed.
Received: 19 September 2011 / Revised: 14 October 2011 / Accepted: 14 October 2011 / Published: 19 October 2011
(This article belongs to the Section Physical Sensors)
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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 sonic anemometry; greenhouse; ventilation; insect-proof screens
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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López, A.; Valera, D.L.; Molina-Aiz, F. Sonic Anemometry to Measure Natural Ventilation in Greenhouses. Sensors 2011, 11, 9820-9838.

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