Djamel Mennouche

Opportunites et Challenges de la Promotion des Energies Renouvelables en Algerie

The economical development of any country cannot depend solely on one type of energy resource, like the case of Algeria with energy fossils. These cannot be exploited for a long time. Therefore, our country must diversify its energetic bouquet by developing renewable energies especially solar and wind. For this purpose, several laws and financial means have been established in this sense, nevertheless, are these engagements sufficient to reach our aim if we do not associate seriously the human resources. That is where the whole problematic is.

Thermal behavior modeling of a cabinet direct solar dryer as influenced by sensible heat storage in a fractured porous medium

Numerical simulation method has been employed to improve the thermal performance of cabinet direct solar dryer. The present study focused on the numerical simulation of a direct solar dryer with integration of a flat layer of fractured porous medium above the absorber plate in the aim to store thermal energy by sensible heat. Several calculations were conducted, using the finite volume method with a two-dimensional unsteady model implemented in the Fluent CFD software. The porous medium has been integrated with different thickness to show the influence of the medium thickness on the thermal performance of solar dryer. Different kinds of materials have been tested and studied. The effect of porosity of porous medium has been studied. The obtained results showed that the temperature of drying air is increased by 4°C with integration of porous medium. The increasing in the thickness of the porous medium by 1cm leads to increase the temperature of drying air by 2°C. The increasing of the medium porosity by 10% leads to decrease the temperature of drying air by 1°C. The best material is the one that has a highest specific heat and thermal conductivity.Numerical simulation method has been employed to improve the thermal performance of cabinet direct solar dryer. The present study focused on the numerical simulation of a direct solar dryer with integration of a flat layer of fractured porous medium above the absorber plate in the aim to store thermal energy by sensible heat. Several calculations were conducted, using the finite volume method with a two-dimensional unsteady model implemented in the Fluent CFD software. The porous medium has been integrated with different thickness to show the influence of the medium thickness on the thermal performance of solar dryer. Different kinds of materials have been tested and studied. The effect of porosity of porous medium has been studied. The obtained results showed that the temperature of drying air is increased by 4°C with integration of porous medium. The increasing in the thickness of the porous medium by 1cm leads to increase the temperature of drying air by 2°C. The increasing of the medium porosity by 10...

A simulation study of a solar collector using phase change materials for air heating application needs

Numerical simulation method has been employed to improve thermal performance of plan solar collectors, and to increase their daily operation length. The present study focused on the numerical simulation of a solar collector with integration of a flat layer of phase change material in the aim to store thermal energy by latent heat. Several calculations were conducted, using the finite volume method with a two-dimensional unsteady model implemented in the Fluent CFD software. It was found that the integration of 1cm of PCM layer below the absorber plate increases the collector daily operating length with 2 hours and improves the outlet temperature with a value of 10°C after sunset. The PCM with melting temperature of 345K gave the best temperature at the collector outlet.Numerical simulation method has been employed to improve thermal performance of plan solar collectors, and to increase their daily operation length. The present study focused on the numerical simulation of a solar collector with integration of a flat layer of phase change material in the aim to store thermal energy by latent heat. Several calculations were conducted, using the finite volume method with a two-dimensional unsteady model implemented in the Fluent CFD software. It was found that the integration of 1cm of PCM layer below the absorber plate increases the collector daily operating length with 2 hours and improves the outlet temperature with a value of 10°C after sunset. The PCM with melting temperature of 345K gave the best temperature at the collector outlet.

Experimental study on flat plate air solar collector using a thin sand layer

A flat plate air solar collector was constructed in the laboratory of New and Renewable Energy in Arid Zones LENREZA, Ouargla University-South East Algeria. The absorber of the flat plate air solar collector was laminated with a thin layer of local sand. This acted as a thermal storage system (packed bed) with a collecting area of 2.15 m2 (0.86 m × 2.5 m). It was noticed that the solar heater integrated with the thermal storage material delivered comparatively higher temperatures; thus, giving a better efficiency than the air heater without the thermal storage system.

An Experimental Study on the Drying of Peanuts Using Indirect Solar Dryer

An indirect type natural convection solar dryer is designed, constructed, and investigated experimentally to study the drying of peanut (Arachis hypogaea L.) under the weather conditions of Ouargla, Algeria.