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NUMERICAL STUDY OF HEAT TRANSFER AND AIR FLOW IN HEATED GREENHOUSES

DOI: 10.1615/ICHMT.2008.CHT.2110
12 pages

Nadia Dihmani
Université Mohammed Premier, Faculté des Sciences, Laboratoire de Mécanique & Energétique, 60000 Oujda, Maroc

Ahmed Mezrhab
Laboratoire de Mécanique & Energétique, Département de Physique, Faculté des Sciences, Université Mohammed 1er, 60000 Oujda, Maroc

Larbi Elfarh
Laboratoire de Mécanique & Energétique, Département de Physique, Faculté des sciences, Université Mohammed 1er, 60000 Oujda, Maroc

Hicham Bouali
Laboratoire de Mécanique & Energétique, Département de Physique, Faculté des sciences, Université Mohammed 1er, 60000 Oujda, Maroc

Hassane Naji
Civil Engineering and Geo-Environment Laboratory (LGCgE - EA 4515), Artois University, Faculty of Applied Sciences, Technoparc Futura, F-62400 Bethune, France; Lille University, Northern France, 59000 Lille, France

Abstrakt

In this paper, we present a numerical study of effects of radiative heat transfer inside an horticultural greenhouse, under winter climatic conditions, occurred by varying the number of tubes. These ones square, hot and isothermal are placed symmetrically in the inner greenhouse volume. The governing differential equations are discretized using a finite volume method and the coupling pressure-velocity problem is carried out by the SIMPLER algorithm. The algebraic systems obtained are solved by a conjugate gradient method. Results are reported in terms of isotherms, streamlines and average Nusselt number for Rayleigh number of 103−106. It is found that the effects of radiative heat transfer are observed near solid surfaces. Furthermore, these effects are becoming increasingly important as the number of Rayleigh increases. The rise in the value of Rayleigh number leads to an increase of the overall heat transfer within the greenhouse.

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