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Sensors (Basel). 2011;11(10):9820-38. doi: 10.3390/s111009820. Epub 2011 Oct 19.

Sonic anemometry to measure natural ventilation in greenhouses.

Author information

1
Department of Rural Engineering, University of Almería, Ctra. Sacramento s/n, 04120 Almería, Spain. alexlopez@ual.es

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, u(o) ≥ 4 m s(-1)) reaching 36.3% when wind speed was lower (u(o) = 2 m s(-1)).

KEYWORDS:

greenhouse; insect-proof screens; sonic anemometry; ventilation

PMID:
22163728
PMCID:
PMC3231258
DOI:
10.3390/s111009820
[Indexed for MEDLINE]
Free PMC Article

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