http://depot.umc.edu.dz/handle/123456789/12523 2026-04-30T13:05:02Z http://depot.umc.edu.dz/handle/123456789/12626 MODELING AND NUMERICAL SIMULATION OF SOLAR CHIMNEY COLLECTOR Tayebi, T; Djezzar, M The solar chimney Power plant system (SCPPS) is a simple solar thermal power plant that is capable of converting solar energy into thermal energy in the solar collector. In the second stage, the generated thermal energy is converted into kinetic energy in the chimney and ultimately into electric energy using a combination of a wind turbine and a generator. The purpose of this study is to conduct a more detailed numerical analysis of a collector of the SCPPS. A mathematical model based on the Navier–Stokes, continuity and energy equations was developed to describe the solar chimney power plant collector mechanism in detail. The governing equations were solved numerically using an iterative technique.The temperature, velocity and pressure distributions in the solar collector are illustrated for the city of ‘Adrar’ – Algeria – to examine the effect of varying ambient temperature and solar radiation on the flow in the collector. Reasonably good quantitative agreement was obtained between the experimental data of the Manzanares prototype and both the numerical results 2013-02-17T00:00:00Z http://depot.umc.edu.dz/handle/123456789/12625 EFFECT OF DISPERSION AND PARTICLES MORPHOLOGY ON PERCOLATION PROCESS OF TRIFLUOROCHLOROETHYLENE AND CARBON POWDER MIXTURES DURING THEIR COMPRESSION AND SINTERING Revo, S.L; Hamamda, S; Avramenko, T.G; Ivanenko, E.A The development of physical principles of production and investigation of conducting polymer nanocomposites(PNC) is currently an urgent problem of modern material science. The optimization of significant characteristics of those materials advance them to the front among the materials of the electric destination. They саn be used in the making the elements of electrical heater, electromagnetic shields, strain sensors, electrostatic precipitators etc. In comparison with products which are fabricated from metals and ceramics they have a lot of advantages. PNC possess higher corrosion resistance and low density. They are easy workable, elastic and fatigue-resistant. The manufacturing cost of polymer nanocomposite materials (PNCM) is also low. Traditionally, conductive fillers, such as metallic powders, natural graphite, carbon black etc. are used in PNCM fabrication. The considerable changes of the percolation threshold (Cc) (Ccis the concentration of filler in which the “infinite”cluster is form in polymer matrix and composite material becomes conductive) could be caused by dispersion degree and morphology of the filler particles. Particularly, Cc ≈ 34 vol.% for conductive compositions filled with equiaxial particles of micron sizes [1]. Usually, the addition of large amounts of fillers to polymers results in low mechanical performance of composites. Meanwhile, in a case of PNCMs the value of Cc does not exceed 6 vol.% [2]. Such concentration and nanodimentionality of a conductive component provide even the improvement rather worsening of the mechanical characteristics [3]. Besides the morphology and dispersion of the powder particles, the uniformity of their distribution in mixture, adhesive ability, compacting conditions and their influence on the structural changes in the matrix are the important factors in fabrication of PNCM from powder mixtures. The effect of such parameters on the characteristics of fluoroplastic (FP) – thermo-exfoliated graphite (TEG) PNCMs are here reported 2013-02-17T00:00:00Z http://depot.umc.edu.dz/handle/123456789/12624 DETERMINATION OF OPTIMUM DEPOSITION CONDITIONS OF ZINC OXIDE THIN FILMS ELECTRODEPOSITED FOR PHOTOVOLTAIC SOLAR CELLS Rahal, H; Kihal, R; Affoune, M. A The thin films of zinc oxide (ZnO) have been grown by electrodeposition technique onto tin oxidecoated glass (ITO/glass) substrates from a simple aqueous zinc nitrate electrolyte. The electrodeposition mechanism was investigated by cyclic voltammetry. The optimum deposition conditions like potential, pH and bath temperature are found to be ─ 1 V (SCE), 6 ± 0.1 and 65 °C, respectively 2013-02-17T00:00:00Z http://depot.umc.edu.dz/handle/123456789/12623 MANAGEMENT TRAITS OF THE PROJECTS CONCERNING POWER GENERATION AND WASTE RECOVERY Prykhod’ko, I; Shpylyovyj, VC; Shpylyova, T; Zakharenko, M Nowadays a large number of motivations and a growing interest exist for the development of renewable sources of energy, like energy systems based on biomass. Organic waste recovery as a component of the environmental protection is widely recognized to be a preemptive trend in the innovation development all over the world. The aerobic and aerobic-anaerobic fermentation of the organic feedstock including those based on modern nano-biotechnologies are considered currently as prospective technologies that permit to exclude the using of conventional lagoon and to reduce significantly the emission of the greenhouse gases (carbon dioxide, methane etc.). These technologies are realized in a form of the integrated bioenergy complexes (IBCs). So, the principal advantages of IBCs are the total waste recovery, production of biogas, biofertilizers and fuel palettes and low amount of the greenhouse gases 2013-02-17T00:00:00Z