Abstract
Insect-proof screens are a frequent passive method to restrict the entrance of insects into greenhouses. However, the installation of these screens also has a negative effect on natural ventilation, which is reflected in the turbulence and velocity of the airflow inside the greenhouse. The turbulent characteristics of airflow through an insect-proof screen installed in the greenhouse windows have not been studied thoroughly in the literature. The present work focuses on the use of two simultaneous 3D sonic anemometers to study the impact of the use of a 13 × 30 threads·cm−2 insect-proof screen on the turbulence properties of the micro and microscale airflow turbulence. Four tests have been carried out in windward-oriented side windows of a Mediterranean greenhouse. Results demonstrate that the approach of using two simultaneous 3D sonic anemometers for the first time allows one to observe that the effect is different for the three components of the velocity vector field, and there is a strong connection between the simultaneous conditions inside and outside of the greenhouse. Useful information and data on the effect of using a 13 × 30 threads·cm−2 insect-proof screen are also provided. To give details on the impact of screens in the turbulent properties of ventilation is essential for any commercial distribution, as well as providing important data in the design and development of more efficient insect-proof screens.
Highlights
Insect-proof screens are a frequent passive method to restrict the entrance of insects into greenhouses
Introduction with regard to jurisdictional claims in Currently, natural ventilation systems in greenhouses are conditioned by the widespread use of insect-proof screens with high thread density and low porosity
As a reference on the impact on the greenhouse economy, Taylor et al [5] estimated that the losses caused by the Bemisia tabaci were up to between 15 and 32 million dollars during 1980 and published maps and institutional affiliations
Summary
The present experimental work was carried out at the research farm property of the. ◦ 160 W). Sketch of of the the halved halved greenhouse greenhouse for During thetests, tests,two twoside sidewindows windows IPS in greenhouses in the Mediterranean of Almería which a standard region ofregion. SizeThe of the greenhouse is similaristosimilar the average that insects typical of the area size of the greenhouse to thegreenhouse average greencan be that found the Mediterranean region. It is thenits irrelevant its conducted size as we the experiments near the IPS, where convection of windward-oriented vents is dominant. Conducted the experiments near the IPS, where convection of windward-oriented vents is.
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