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Numerical Simulation and Measurement of Air Temperature and Relative Humidity in an Olive Cuttings Tunnel Greenhouse

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Open Journal of Modelling and Simulation 2022年第1期10卷 32-47页

作者： Sanae Chakir Adil Bekraoui Hassan Majdoubi allal senhaji Mhamed Mouqallid Department of Energy ENSAM University Moulay Ismail Meknes Morocco Laboratory of Scientific Research and Pedagogical Development Fes-Meknes Morocco

Understanding the environment of olive tree cuttings is a key factor in improving these plants’ rooting rate and survival. This study aims to develop a three-dimensional (3-D) Computational Fluid Dynamics (CFD) model for numerically assessing air temperature and relative humidity in an olive cuttings greenhouse under Mediterranean climatic conditions. The results are deduced from a steady-state simulation performed with recorded boundary conditions at 10:00 am, 12:00 pm, 02:00 pm, 04:00 pm, and 06:00 pm at different observation points. The calculations were validated using experimental data. The simulation errors of the air temperature were -0.8°C to 4.55°C, and errors of the leaf temperature were 0.07°C to 2.42°C, for the air relative humidity was -33.84% to -1.64%, and

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CFD Assisted Study of Multi-Chapels Greenhouse Vents Openings Effect on Inside Airflow Circulation and Microclimate Patterns

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Open Journal of Fluid Dynamics 2019年第2期9卷 119-139页

作者： allal senhaji Mhamed Mouqallid Hassan Majdoubi Equipe de Recherche en Energétique et Mécanique des Fluides ENSAM Meknès Maroc CRMEF Fes-Meknès Maroc

The aim of this work is to study and quantify the air mass flow exchanged between inside and outside of the greenhouse, in order to determine the ventilation openings layout and the design effect on greenhouse airflow and microclimate distribution. The study was conducted over a 945 m2 multi-chapels arched greenhouse with a polyethylene cover and has thirteen crop rows oriented from north to south;the greenhouse was equipped with side wall and roof vents openings. A simulation was performed using different arrangements and configurations of ventilation openings with the same wind direction. Numerical simulation has been adopted in three dimensions (CFD), using the Fluent computer code which relies on the resolution of the Navier-Stokes equations. These equations were solved in the presence of the turbulence model (k - ε) and the Boussinesq model equation adopted to incorporate buoyancy forces. The effects of solar and atmospheric radiation were included by solving the radiative transfer equation (RTE), using Discrete Ordinate (DO) model. The effects of the roof openings, the presence of anti-insect screens and crops orientation were investigated and quantified. In a 3-span greenhouse with an anti-aphid in-sect screen in the vent openings, combining roof and sidewall vents gave a ventilation rate per unit opening area that was 1.4 times more than with only side vents. In the latter case, the difference of temperature between the inside and the outside of the greenhouse was greater than 3°C. Numerical simulations with an anti-insect screen having a porosity of 56% showed that the air exchange rate with combined ventilation was reduced by 48%. Finally, the paper focused on the effect of vent arrangement on the efficiency of the ventilation and the distribution of the microclimate inside the greenhouse. Results showed that computed ventilation rates varied from 53.43 to 70.95 kg/s, whereas temperature differences varied from 7.15°C to 10.14°C. This study als

关键词： Greenhouse Microclimate Computational Fluid Dynamics (CFD) Ventilation Solar Radiation

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Canary Greenhouse CFD Nocturnal Climate Simulation

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Open Journal of Fluid Dynamics 2016年第2期6卷 88-100页

作者： Hassan Majdoubi Thierry Boulard Hicham Fatnassi allal senhaji Salma Elbahi Hassan Demrati Mhamed Mouqallid Lahcen Bouirden Laboratoire de Recherche Scientifique et Pédagogique au Monde Méditerranéen CRMEF Meknès-Tafilalet Maroc Equipe de recherche en Energétique et Mécanique des Fluides ENSAM Meknès Maroc INRA Univ. Nice Sophia Antipolis CNRS UMR 1355-7254 Institut Sophia Agrobiotech Sophia Antipolis France Laboratoire de Thermodynamique et Energétique Faculté des Sciences Agadir Maroc

The aim of this paper is to predict in details the distributed nocturnal climate inside a one hectare Moroccan canary type tomato-greenhouse equipped with continuous roof and sidewalls ventilation openings with fine insect screens, by means of 3D CFD (Computational Fluid Dynamics) simulations by using a commercial Software package CFD2000 based on the finite volumes method to solve the mass, momentum and energy conservation equations. The turbulent transfers were described by a k-ε model. Likewise, the dynamic influences of insect screens and tomato crop on airflow movement were modeled by means of the concept of porous medium with the Boussinesq assumption. Atmospheric radiations contribution was included in the model by customising the plastic roof cover temperature deducted from its energy balance. Also, the CFD code was customized in order to simulate in each element of the crop cover the sensible and latent heat exchanges between the greenhouse air and tomato crop. Simulations were carried out with a wind prevailing direction perpendicular to the roof openings (west-east direction). Simulations were later validated with respect to temperature and specific humidity field measurements inside the experimental greenhouse. Also, the model was verified respect to global sensible and latent heat transfers. Results show that, generally, greenhouse nocturnal climate distribution is homogeneous along the studies greenhouse area. The insect proof significantly reduced inside airflow wind speed. But there is no significant effect on the inside air temperature and specific humidity respect to outside.

关键词： Greenhouse CFD Airflow Microclimate Insect Screens

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