MESMOUDI K, SOUDANI A, BOURNET PE, BOUGOUL S.
The Convection Heat Transfert Coefficient at the Greenhouse Cover under Semi Arid Climatic Conditions” from 22 to 25 April. The second international conference on conversion energy and conservation. 2010.
MESMOUDI K, SOUDANI A, BOURNET PE, BOUGOUL S.
Heat Transfer Conductance at the Greenhouse Cover, WERA’, , 28-29 Septembre,. Work Shop International sur les Energies renouvelables et leurs Application. 2010.
MESMOUDI K, SOUDANI A, BOURNET PE.
The determination of the inside air temperature of a greenhouse with tomato crop, under hot and arid climates. [Internet]. 2010;Vol. 5 (N°2) :pp 114-127. .
Publisher's VersionAbstract
Up to now, few studies were devoted to the description of the energy balance components of a greenhouse located in the semi arid region of the southern Mediterranean basin, and no attention was paid to the prediction of the inside air temperature. In this study, experiments were undertaken to investigate the response of a greenhouse to the outside climate conditions considering a naturally ventilated Venlo glasshouse with a tomato crop. The measurements show that the difference between inside and outside air temperature is strongly linked to the incoming solar radiation as well as to the wind speed. From these results a simplified model was established to predict the greenhouse air temperature, knowing the greenhouse characteristics and the outside climate variables. The model is based on the energy balance of the greenhouse. Using a parameter identification technique, the model was calibrated against the experimental results. A sensivity analysis was conducted to assess the impact of several physical parameters such as solar radiation, wind speed and cover transmission on the evolution of the inside air temperature. This model appears to be suitable for predicting the greenhouse air temperature satisfactorily, at least during night
MESMOUDI K, SOUDANI A, ZITOUNI B, BOURNET PE, SERIR L.
Experimental study of the energy balance of unheated greenhouse under hot and rid climates: Study for the night period of winter season,. Journal of the Association of Arab Universities for Basic and Applied Sciences [Internet]. 2010;vol. 9 :pp: 27-37.
Publisher's VersionAbstract
In regions with warm and hot climates as is the case of several countries of the Mediterranean basin, it is interesting to study the energy balance inside a greenhouse and to quantify the heat transfers along the building components (roof, walls and ground) in winter and during night time. The present experimental work was conducted in an unheated glasshouse without crop in the region of Batna, Algeria. Three types of measurements were done from January to March: the first one is at a cloudy night; the second one at a windy night and the third one at a cloudless night. The results indicate that the greenhouse ground is considered as a significant heat source which can compensate the energy losses through the walls especially during a night preceded by a significant diurnal insulation. In addition, the convection heat transfer coefficients inside and outside the greenhouse were estimated and analysed. A good agreement with the models reported in the literature was found.
Derardja A.
Anisotropic Elastic Distortions of a Buried Dissociated Hexagonal Network of Dislocations in a Nickel Based Super Alloys,. Advanced Materials Research, Advances in Materials and Processing Technologies [Internet]. 2010;Volumes 83 - 86 :pp 289-295.
Publisher's VersionAbstract
Nickel based super alloys are promising materials for high temperature structural applications because of their low density. The single grain super alloys are extremely creep resistant at high temperature, due to the fraction of Ni3Al based ' precipitates coherent with a Ni based matrix [1, 3]. The cuboids group together and form semi-coherent interfaces after a long annealing at high temperature. The ' precipitate growths in nickel base super alloys often favor the parallelism of (111) planes between cubic dissimilar crystals [4]. In consequences, a hexagonal network of dislocations, that covers the hetero-interphase, is arranged by accommodation of the angular misfit between two semi coherent crystals ( ). In this work, the magnitude of the distortions is simulated as arising from a trigonal network of subsurface misfit dislocations partly dissociated in Shockley dislocations limiting intrinsic and /or extrinsic stacking faults. The results derived from a previous explicit formulation using double Fourier series [5]. Each harmonic term of the series depends on the anisotropic elastic constants and the thickness of each phase. The program built is in a double precision Fortran language and it shows the magnitude and the aspect of the distortions of the free surfaces when the dissociation change in the hetero-interphase. Also, the program has the advantage to fully apply to hetero-epitaxial systems, whatever is the thickness of the free surfaces.
