Computational Study of Canary Greenhouse Side Wall and Roof Vents Opening Effect on Nocturnal Airflow and Climate Patterns

Autor: Hassan Majdoubi, Hicham Fatnassi, Thierry Boulard, Allal Senhaji, M’hamed Mouqallid, Hassan Demrati, Lahcen Bouirden, Salma Elbahi
Rok vydání: 2019
Zdroj: American Journal of Agricultural Science, Engineering, and Technology. 3:72-88
ISSN: 2158-8104
2164-0920
DOI: 10.54536/ajaset.v3i1.39
Popis: 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.
Databáze: OpenAIRE
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