FATNASSI , Hicham

A combined greenhouse climate and crop model is crucial to predict the effect of global climate change on greenhouse production. Studying the consequences of climate change on crop production needs associating several sub-models dealing with: (i) greenhouse actuators control, (ii) greenhouse climate and (iii) tomato plant growth models.|We have...

Easily simulating inside climate conditions in the large insect screened Canary type greenhouses used intensively along the Moroccan coast is particularly important in enhancing this production system. We have therefore developed a global greenhouse climate model based on combined sensible and latent heat balances in which the ventilation flux...

The increasing demand for sustainable biomass has made microalgae farming into the spotlight as a viable sourceof biofuels, nutraceuticals, and other valuable products. Raceway ponds are one of the most common systems inalgaculture due to their simplicity and cost-effectiveness. However, their efficiency is significantly influenced...

Future agriculture systems are concerned by two main challenges for humankind: to produce enough to feed a growing world population, and to produce the share of renewable energies. Among these, biofuels and photovoltaics compete for arable land in food production. Photovoltaic systems can combine with extensive agriculture or livestock; in...

Recently, many systems incorporating photovoltaic panels have emerged. In agriculture, this technology has been incorporated in greenhouses giving rise to new agro-systems called "photovoltaic greenhouses" which can produce electricity while ensuring a plant production. Previous studies have shown that the solar radiation received inside the...

The aim of this study is to evaluate the effect of shading induced by the photovoltaic panels on crop yields inside the greenhouse. The yield performance has been evaluated by using the tomato plant growth TOMGRO model. This model predicts the number and dry mass of leaves, stem segments and fruits, as well as the increase in leaf area as new...

Climate change is currently considered a major concern for humanity. Future climate projections carried out for the Souss region in the south of Morocco show that temperature will increase by 3 degrees C and precipitation will dramatically decrease by 63% towards the end of the twenty-first century. This will have negative impacts on water...

Accurately predicting the microclimate distributed inside a greenhouse equipped with photovoltaic panels is a prerequisite for sustainable energy-saving greenhouse management. It can also help to improve the design of these kinds of greenhouse while enhancing the radiation transmission inside. This study is an essential prerequisite for...

Predicting accurately the microclimate distributed inside greenhouse equipped with photovoltaic panels is a prerequisite for sustainable energy-saving greenhouse management. It can also help to improve designers in improving the design of these kinds of greenhouse while enhancing the radiation transmission inside. This study is an essential...

This paper presents the results of the simulation of the temperature and air humidity distributions in a 960 m2 semi closed greenhouse with a tomato crop and equipped with fourteen air cooling and dehumidifying ducts. These units are distributed between the crop rows and the sucking inlets are alternately located at high or low locations. The...

Accurately predicting the distributed microclimate inside greenhouse equipped with photovoltaic panels would be a prerequisite to developing a sustainable energy-saving greenhouse. Predicting the microclimate can contribute to enhanced performance in these kinds of greenhouses by improving the radiation transmission efficiency inside. In this...

This work aims at predicting CO2 concentration inside an experimental energy saving and semi closed greenhouse with a tomato crop. For that purpose, a 3D model of a cropped greenhouse has been created, including a discrete CO2 injection system and an air-cooling and dehumidifying system. The model has been developed using the Fluent CFD code....

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For the 1990s computational Fluid Dynamics (CFD) has allowed significant progresses for modeling the greenhouse distributed climate, including at crop level. It chiefly relies on the dynamic action of the crop on air flow and the subsequent heat and mass exchanges. Thus, the CFD approach combined different scales of modeling: the greenhouse and...

Closed greenhouse systems allow micrometeorological conditions to be optimised for both energy saving and high quality yields. However, micrometeorological parameters need to be accurately monitored as a response to daily environmental conditions changes. A Computational Fluid Dynamics (CFD) model was developed to predict the distribution of...

This study aims to use Computational Fluid Dynamic (CFD) software to explore the distributed climate inside greenhouses and especially in the leaf boundary layer, natural habitat of plant pests. Knowing more precisely the climatic conditions prevailing at this level is a prerequisite to the control of the climate at this level in order to fight...

This study is principally based on predicting the consequences on the microclimate of changing greenhouse design. Several variations on the greenhouse design have been described and examined, i.e. the number of spans and gutter height. Climate investigations were based on numerical simulations using the CFD model and included the dynamic effect...

Photovoltaic greenhouses have been claimed to be a solution to cover the energy demand of the protected crops sector. Thus, there is a need to know what is the maximum percentage of shading produced by roof-top photovoltaic panels that does not affect crop yields. The present study analyzes the effects of increasing percentages of shading in a...

This work presents an energy analysis of an industrial plant of production of Di-ammonium Phosphate (DAP plant). It aims to evaluate the important amount of waste heat discharged into environment without re-use. The studied plant includes four units: Utilities unit, Sulfuric acid production unit, Phosphoric acid production unit and DAP...

The increasing cost of electricity often drives the famers of the countries of the southern shore of the Mediterranean, to adopt the natural ventilation in order to provide greenhouse aeration. The roof and sidewall vents are opened to allow the excess heat to escape and cooler outside air to enter during daytime. During night time, these...

Frankliniella occidentalis (Pergande) is a key pest of various crops worldwide. In this study, we analyse the dependence of the infestation of this pest on spatially distributed micro climatic factors in a rose greenhouse. Despite the importance of this subject, the few existing studies have been realized in laboratory rather than in greenhouse...

The quality requirements of crops, particularly for export, are causing more and more Moroccan producers to consider heating their greenhouses. As the heating costs by conventional energy sources (coal, oil and natural gas) is too high, especially for developing countries, the use of renewable energy technologies and systems to heat the...

Essential oils (EOs) are increasingly used as biopesticides due to their insecticidal potential. This study addresses their non-target effects on a biological control agent: the egg parasitoid Trichogramma evanescens. In particular, we tested whether EOs affected parasitoid fitness either directly, by decreasing pre-imaginal survival, or...

Protected cultivation or Controlled Environment Agriculture (CEA) system has increased tenfold in the last 25 years thanks to tremendous scientific and technical breakthroughs, mainly directed to increasing crop yields and adapting to tough ambient conditions. Currently, greenhouse areas are still spreading and the CEA system is one of the...