In this paper, the numerical results of the study on geothermal-air heat exchanger in dry areas of Algeria (Ghardaia region) were presented. Computational fluid dynamics equations were solved using our specific code compilated with Fortran. The outputs of the numerical calculations were compared and validated with the experimental results and the outputs of a commercial CFD code. In these conditions, our results present good agreements with an error not exceeding 2%. By using our numerical model, we have calculated the optimum length, the internal diameter, the air velocity of the pipe in winter and summer periods and have determined the optimum depth at different depths. The comparison of two types of pipes making material (PVC and PEHD) has taken into account the characteristics of the Ghardaia-Algeria region (specific heat capacity, density, thermal conductivity and temperature) of the soil. The obtained results proved that the chosen model gives a satisfactory agreement in all the studied variables.
Building aeration ventilation may contribute to achieve thermal comfort there by economizing huge amount of electricity that would be supplied using conventional air conditioning systems. Natural ventilation maintains thermal equilibrium between heating and cooling balances. They may also be used in conjunction with other systems in certain circumstances. Model governing equation of physical phenomena enabling description the thermo-aeraulic behaviour. Based on the measurements in winter and summer periods of several physical parameters like the wind velocity and the ambient temperature, the influence of infiltration rate on the thermal comfort were demonstrated. The present study is the simulation investigation the evolution of internal multi-zone temperature of Saharan building in Ghardaïa (32°38 N, 3°78 E), Algeria. Building construction process should take advantage of many practices characterizing location traditional construction. Specifically, satisfaction of seasonal thermal comfort requirement (heating, cooling) and favour maximum solar passive gains. The results showed that the major factor for the reduction of the internal temperature of the studied building is the natural ventilation including the thermal comfort range (20-27)℃.
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