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SIMULATION OF CLIMATE INSIDE TUNNEL GREENHOUSES WITH VERTICAL WALLS

DOI: 10.1615/ICHMT.2009.CONV.1180
9 pages

Cherine Labaal
Laboratoire de Physique Energйtique Appliquée Faculté des Sciences, Université de Batna, Algérie

Samra Zeroual
Laboratoire de Physique Energйtique Appliquée Faculté des Sciences, Université de Batna, Algérie

Saadi Bougoul
Laboratoire de Physique Energйtique Appliquée Faculté des Sciences, Université de Batna, Algérie

Résumé

In this study, heat transfer and airflow in opened tunnel greenhouse with and without plant has been studied and the effect of wind speed on the natural ventilation is analysed by means of computational fluid dynamics (CFD) using the commercial software CFD 2000 based on the finite volume method. The airflow through the crop was described by using the porous medium approach. Three dimensional simulations which described turbulent flows in steady state were carried out and the turbulence was modeled by using the standard k-ε model.
The air temperature variation shows a gradient from the sidewalls towards the centre of the greenhouse due to the movement of the hot air rising towards the roof vent, and a vertical gradient due to the movement of the air above the surface of the heated floor. At the openings, the maximum air velocity was reached and the lowest values are observed in the middle of the greenhouse and at the crop level. The results of the simulation given as airflows and temperature patterns are satisfactory while comparing them to those of the liter.

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