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.

The studied zone is a part of the Mellegne’s (North-East of Algeria) under pound, this zone is characterised by itssemi-arid climate.The water bearing system is formed by the plio-quaternairy alluviums resting on a marley substratuim of ageEocene.The geostatiscitcs approach of the hydrodynamics parameters (Hydrolic load, transmisivity) allowed the studyof their spatial distrubution (casting) by the method of Krigeage by blocks and the identification of zones withwater-bearing potentialities.In this respect, the zone of Ain Chabro which, is situated in the South of the plain shows the best values of thetransmisivity......The use of a bidimensinnel model in the differences ended in the permanent regime allowed us to establish theglobal balence sheet (overall assessment) of the tablecloth and to refine the transmisivity field. These would varymore exactley between 10-4 to 10-2 m2/s.The method associating the probability appraoch of Krigeage to that determining the model has facilited thewedging of the model and clarified the inflitration value