Models for characterising the aerodynamics of insect-proof screens from their geometric parameters

López-Martínez, Alejandro; Molina-Aiz, F.D.; Valera, D.L.; Espinoza-Ramos, K.E.

doi:10.1016/j.biosystemseng.2020.01.013

Cited by 9 publications

(59 citation statements)

References 40 publications

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“…The insect-proof screen (IPS) installed at the vents is a 13 × 30 threads•cm −2 (Figure 2), whose geometric properties can be characterized according to Valera et al [30]. Following the methodology, Table 1 summarizes the characteristics of the IPS under study, which is a standard IPS in greenhouses in the Mediterranean region of Almería because of its demonstrated good ventilation properties together with exclusion of most insects typical of the area [25]. The size of the greenhouse is similar to the average greenhouse that can be found in the Mediterranean region.…”

Section: Methodsmentioning

confidence: 99%

“…The study of the aerodynamic properties of IPS is then also an impor-tant aspect in order to understand their impact on ventilation. López-Martínez et al [25] obtained mathematical models for the characterization of insect-proof screens, which were related to geometric aspects (diameter of threads, porosity, etc.) with parameters of interest for ventilation, such as permeability, inertia factor, and pressure drop coefficient.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Turbulent Air Flow Characteristics Due to the Presence of a 13 × 30 Threads·cm−2 Insect Proof Screen on the Side Windows of a Mediterranean Greenhouse

et al. 2022

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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.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of Turbulent Air Flow Characteristics Due to the Presence of a 13 × 30 Threads·cm−2 Insect Proof Screen on the Side Windows of a Mediterranean Greenhouse

et al. 2022

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“…This is expressed as a function of the velocity of the air passing through the WS according to ∆P = a 1 U 2 + a 2 U [8,38,39]. In this equation, a 1 and a 2 are two modelling coefficients that depend on two important mechanical characteristics of the mesh: the permeability of the porous medium (K p ), which depends on the geometry of the porous medium; and the inertial factor (Y ), which depends on the nature of the porous media [40,41].…”

Section: Introductionmentioning

confidence: 99%

“…Much more recently, Lopez et al [40] developed more advanced models that allow to estimate K p from the two-dimensional porosity and the diameter of the threads; and Y from the diameter of the threads and the diameter of the inner circumference of the pore. Wind tunnel measurements and CFD numerical modelling has been also a support in other investigations to achieve better characterisations [43] or to identify key parameters (pressure loss coefficient, drag coefficient and tunnel experiments [44].…”

Section: Introductionmentioning

confidence: 99%

Estimation of the aerodynamic tortuosity of woven/wire screens

Granados-Ortiz,

Ortega-Casanova,

Lopez-Martinez

et al. 2023

Journal of Wind Engineering and Industrial Aerodynamics

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“…During the last decade, insect-proof screenhouses (IP-SH) have gained a lot of interest among growers. These simple and cheap structures offer advantages such as the protection of the crops against pests, reduction of excessive solar radiation levels and, a higher water efficiency use which is relevant in drought prone warm regions [6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Thermal Simulation of a Screenhouse Proposed for Fruit and Vegetable Production in the Lowlands of Panama

Villagrán¹

2021

IJHT

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In developing countries, open field agricultural production is highly vulnerable to biotic and abiotic factors limiting crop productivity, generating economic losses and affecting food security. Therefore, one of the strategies that can improve these production systems is the implementation of the crops under cover technically adapted to the climatic and socioeconomic conditions of each region. The objective of this research was to analyze the thermal behavior and airflow patterns of an insect-proof screenhouse through computational fluid dynamics simulations using a 3D model. The results obtained for the multiannual monthly climatic conditions of a warm climate region in Panama showed that the airflow velocities inside the structure were lower between 76.8 and 80.2% with respect to the external velocity. The most critical scenarios showed temperature differences below 2℃ inside the screenhouse with respect to the outside. This value can be considered low as compared to the behavior of naturally ventilated greenhouses.

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Models for characterising the aerodynamics of insect-proof screens from their geometric parameters

Cited by 9 publications

References 40 publications

Analysis of Turbulent Air Flow Characteristics Due to the Presence of a 13 × 30 Threads·cm−2 Insect Proof Screen on the Side Windows of a Mediterranean Greenhouse

Analysis of Turbulent Air Flow Characteristics Due to the Presence of a 13 × 30 Threads·cm−2 Insect Proof Screen on the Side Windows of a Mediterranean Greenhouse

Estimation of the aerodynamic tortuosity of woven/wire screens

Thermal Simulation of a Screenhouse Proposed for Fruit and Vegetable Production in the Lowlands of Panama

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