Resumo

PEREZ VEGA, Cuauhtémoc; RAMIREZ ARIAS, José Armando  e  LOPEZ CRUZ, Irineo L.. Aerodynamic characteristics of anti-insect mesh windows used in greenhouses in Mexico. Rev. Mex. Cienc. Agríc [online]. 2016, vol.7, n.3, pp.493-506. ISSN 2007-0934.

They were analyzed by tests microscopy and wind tunnel, geometric characteristics, porosity and pressure drop, respectively seven different meshes commonly used as physical barriers windowing Mexican greenhouses to determine its effect on the ventilation rate, permeability and the inertial factor. The meshes were analyzed in the Chapingo in May 2013 were: anti-thrips (M1), anti- thrips bicolor (M2), anti-aphid (M3), anti-aphid bicolor (M4), zenithal (M5), green-black windbreaker (M6) and anti-aphid white (M7), whose porosities were 0.36, 0.35, 0.47, 0.45, 0.54, 0.29 and 0.43 respectively. The geometry of the meshes is performed by measuring the areas of the pores with an optical microscope to determine the porosities and calculate the decrease in ventilation rate. Subsequently, the most important aerodynamic characteristics; i. e. inertial factor and permeability were determined using a wind tunnel to measure the relationship between the pressure drop caused by each mesh and the speed of the airf low. The results showed that the zenithal mesh (M5) has the least resistance to air flow with 21% decrease in ventilation rate, while the green- black windbreaker mesh (M6) was 50%. Greenhouses in Mexico typically use anti-aphid mesh with porosity between 0.43 and 0.47 for the side windows and zenithal type.

Palavras-chave : inertial factor; permeability; porosity; pressure drop.

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