COMPUTATIONAL STUDY OF CANARY GREENHOUSE SIDE WALL AND ROOF VENTS OPENING EFFECT ON NOCTURNAL AIRFLOW AND CLIMATE PATTERNS

Authors

  • Hassan Majdoubi 1 Laboratoire de Recherche Scientifique et Pédagogique au Monde Méditerranéen, CRMEF Meknès-Tafilalet, Meknès, Maroc
  • Hicham Fatnassi INRA, Univ. Nice Sophia Antipolis, CNRS, UMR 1355-7254 Institut Sophia Agrobiotech, 06900 Sophia Antipolis, France
  • Thierry Boulard INRA, Univ. Nice Sophia Antipolis, CNRS, UMR 1355-7254 Institut Sophia Agrobiotech, 06900 Sophia Antipolis, France
  • Allal Senhaji Equipe de recherche en Energétique et Mécanique des Fluides, ENSAM Meknès, Maroc
  • M’hamed Mouqallid Equipe de recherche en Energétique et Mécanique des Fluides, ENSAM Meknès, Maroc
  • Hassan Demrati Laboratoire de Thermodynamique et Energétique (LTE), Faculté des Sciences, Agadir, Maroc
  • Lahcen Bouirden Laboratoire de Thermodynamique et Energétique (LTE), Faculté des Sciences, Agadir, Maroc
  • Salma Elbahi Laboratoire de Recherche Scientifique et Pédagogique au Monde Méditerranéen, CRMEF Meknès-Tafilalet, Meknès, Maroc

Keywords:

Greenhouse, CFD, Insect screen, Ventilation openings, Climate

Abstract

The following paper presents a Computational Fluid Dynamic (CFD) comparative study of
the effect of side wall and roofs vents openings on canary greenhouse airflow circulation and
climate distribution under different ventilation processes. The investigation was conducted in
a one hectare canary greenhouse type, which is the most widespread type in the whole
Mediterranean and along the Atlantic coast area of Morocco, especially in souss vally region.
The simulations were performed with the commercial code CFD2000 based on the solution of
the partial differential equations, which describe the flows, and was obtained by discretizing
the space and time and solving the transport equations on the spatial grid as difference
equations, used a finite volume discretization. The standard two equations k-ε model was
used to describe the turbulent transport. The influence of external factors such the cover
temperature, the wind speed, on the flow was simulated by boundary conditions, these values
were obtained from experimental results. Simulations were conducted with a fixed wind
speed equal 1.05 m/sec, tomato crop rows oriented north-south and the ventilation openings
are continuous and equipped with insects screen type 20/10. Results reveal that ventilation
opening arrangements strongly affects the greenhouse wind speed, which can generate a
heterogeneous climate, especially during daytime. But in the other hand, results confirm that
there is no significant effect of the side wall vents opening on canary greenhouse air
temperature and humidity fields.

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Published

2017-03-29