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AIRFLOW AT THE OPENINGS OF A NATURALLY VENTILATED ALMERÍA-TYPE GREENHOUSE WITH INSECT-PROOF SCREENS

Article number
893_56
Pages
545 – 552
Language
English
Abstract
The main objective of this particular study was to determine the wind coefficient of an Almería-type greenhouse equipped with insect-proof screens from the ventilation airflow by measuring air velocity through the openings with a tri-directional sonic anemometer.
Measurements were taken with a strong north-east wind (Levante) and with a weak westerly wind (Poniente). For the model considering only the wind effect, the coefficient of effectiveness obtained was EV=CdCw0.5=0.050, and the values of the mean and turbulent wind coefficients were Cw=0.067 and Cw’=0.029, respectively.
Two important characteristics of the Almería-type greenhouse analysed in this work make natural ventilation difficult: the presence of mature tomato plants inside and an obstacle close to one of the side openings.
Discharge coefficients due to the presence of insect-proof screens in the greenhouse (Cd,φ=0.156-0.245) were calculated from wind tunnel measurements, obtaining a total discharge coefficient of Cd=0.193. Use of the screen in the openings can cause approximately a 71% reduction of Cd. Winds perpendicular to the axis produce an inflow through the side openings and an outflow through the roof vents.
In qualitative terms, this airflow pattern is in good agreement with previous simulations of Computational Fluid Dynamic in the greenhouse.

Publication
International Symposium on High Technology for Greenhouse Systems: GreenSys2009
Authors
F.D. Molina-Aiz, D.L. Valera, A. López
Keywords
Almería greenhouse, sonic anemometer, ventilation
Full text
https://doi.org/10.17660/ActaHortic.2011.893.56
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