2014 International Conference on Composite Materials & Renewable Energy Applications (ICCMREA)

This paper aims to show what are sustainable practices and behavior in intelligent buildings and how they are taken into account in collaborative projects. It will firstly identify the motivations of industrial partners to study these aspects, and then the type of practices and the place they take in the projects. View full abstract»

CSP reflectors are a key component for CSP technology and are characterized by their specular reflectance (SR), the degree to which a mirror is capable of transferring directed radiation to a target receiver surface. The accumulation of dust on the surface of the reflectors can decrease the ability of their mirrors in reflecting the radiation to the receiver causing an important decrease in the po... View full abstract»

This paper presents a fuel cell simulation model, built to emulate its electrical behavior by using a DC-DC converter and loads. Therefore, a cascade control loop is used in this work to make the fuel cell emulator working with high efficiency. Simulations results are presented to validate emulator design and robustness of the control strategy using Matlab/Simulink. The structure of a proposed sys... View full abstract»

Recently, for environmental, economical, social, in other words, for sustainability reasons, the world started to search for new and cleaner energy sources. Sugar factory of cane and beet are agro-based industry that generates various wastes viz bagasse, molasse, pulp, mud and Foam. The physicochemical characterization showed that most of these byproducts are formed by lignocellulosic matter with ... View full abstract»

Research advances in materials science improved gradually photovoltaic systems efficiency. However, such systems are limited to work in the presence of sun light, and they also depend on the geographic localization and on the period of the year, usually limited to 6 to 8 hours a day. In order to take maximum advantage of solar panels, it is crucial to use them also in cloudy weather or even at nig... View full abstract»

The plasma enhanced chemical vapor deposition (PECVD) technique is used to produce the nanocrystalline silicon films (nc-Si) and deposited on the porous anodic alumina layer (PAA) which is synthesized by electrochemical anodization method. The morphological surface of the nc-Si/PAA films prepared in different substrates was studied by atomic force microscopy (AFM) and Scanning electron microscopy ... View full abstract»

In this paper, the conventional methods to determine shift factor were analyzed and discussed for its disadvantages in life prediction applications. A programme was developed to determine the shift factor automatically. Furthermore, a new model was proposed for modeling the master curve, showing the relationship of storage modulus with time and temperature, with the consideration of shift factor d... View full abstract»

Advanced oxidation processes such as photocatalysis have been shown to be very robust in the removal of biorecalcitrant compounds. In this work, photocatalytic degradation of synthetic textile wastewater (methyl orange dye) in the presence of Cr(VI) was carried out using TiO2 supported onto silica. A composite of TiO2 and silica was prepared, analyzed and applied in a batch p... View full abstract»

A general dynamic model for the study and optimization of reversed cycle thermal machines with three heat reservoirs is presented. The model is based on the First and Second Laws of Thermodynamics, heat transfer equations at finite thermal source and sink capacities, and entropy generation terms in order to consider the internal and external irreversibilities of the cycle. The proposed model is ap... View full abstract»

This paper present a photovoltaic energy application which consist on supplying electricity power to a greenhouse cooling system. It aims to reduce the agriculture production cost and to be an alternative of the absence of electricity specially in arid zone. The photovoltaic generator PVG is controlled via Maximum Power Point Tracking MPPT and the cooling system, modeled as an induction machine, i... View full abstract»

Diamond has the highest SAW velocity of around 11000 m/s among all materials. Therefore, diamond is of particular interest for use in the design of gigahertz-band SAW devices recently. To induce high-velocity SAW, diamond has to be combined with the piezoelectric film, such as aluminum nitride (AlN) or zinc oxide (ZnO) which has been deposited on diamond. Diamond surface acoustic wave (SAW) has be... View full abstract»

An experimental comparative study was conducted in two greenhouses installed in the Research and Technologies Centre of Energy (CRTEn) in Tunisia. The greenhouse heat balance of the greenhouse with a heating system has been used to investigate the impact of the phase change material (PCM) on greenhouse temperature. Results shows the nocturnal variation of temperature inside the greenhouse used a h... View full abstract»

This paper examines the natural convection in a square enclosure filled with a water-Al2O3 nanofluid and is subjected to a magnetic field. The bottom wall is uniformly heated and vertical walls are linearly heated whereas the top wall is well insulated. Lattice Boltzmann method (LBM) is applied to solve the coupled equations of flow and temperature fields. This study has been... View full abstract»

This paper examines the natural convection in a square enclosure filled with a water-Al2O3 nanofluid and is subjected to a magnetic field. The side walls of the cavity have spatially varying sinusoidal temperature distributions. The horizontal walls are adiabatic. Lattice Boltzmann method (LBM) is applied to solve the coupled equations of flow and temperature fields. This stu... View full abstract»

Many authors have used a Monte Carlo simulation to determine the dose rate deposited in a given target, such as the GEANT 4 code [1,2,3] or the MCNP code [4,5,6]. In the present work, GEANT4 was used to determine the mean energy and the dose rate deposited in a PMMA dosimeter [7]. These dosimeters are placed in the vicinity of the National Center for Nuclear Sciences and Technologies (CNSTN) sourc... View full abstract»

In this paper, we present an experimental study about the functionalization of a Tunisian nacrite with a hydrated magnesium chloride salt. The elaborated nanomaterial composite have been studied via X-ray diffraction, IR spectroscopy and EDXS. The quantitative XRD analysis allowed us to determine the structural parameters related to the number and position along the normal of the layers of the alk... View full abstract»

The original incentive for developing the software package was the identification of the unsteady wake structure generation, and the prediction of aerodynamic performances of an airfoil. In fact, one of the key features of Laplace's Equation is the property that allows the equation governing the flow field to be converted from a 3D problem throughout the field to a 2D problem for finding the poten... View full abstract»

The purpose of this work is to evaluate the energy coming to the focus of a solar parabolic concentrator SPC using two types of absorbers: water calorimeter (WC) and solar heat exchanger (SHE), developed in the Research and Technologies Centre of Energy in Borj Cedria in Tunisia (CRTEn). The mean concentration ratio and thermal energy efficiency of the system were obtained experimentally.. We note... View full abstract»

The present study is an experimental investigation for the hydrodynamic of a liquid film falling outside a horizontal tube. By varying the flow rate, many flow regimes are identified. The transitions between different falling-film modes are studied and compared with results of other research. The wavelengths have been measured for each film Reynolds number value for droplets and column modes and t... View full abstract»

This paper presents a study on elaboration and characterization of biohybrides materials LDH-Lactate Dehydrogenase (LDh). The chosen LDHs are (MgAl and ZnAl with R = 2), were synthesized by a coprecipitation method with pH constant. The lactate immobilization in these matrices was obtained by exchange reaction and coprecipitation. A comparative study shows that the coprecipitation method allows a ... View full abstract»

A thermal model regarding a photovoltaic module has been developed and validated using experimental data. The aim of this study was to recovering heat wasted by Joule effect by adding the heat exchanger rear sensor and an additional window forward. We will also compare the thermal and electric performance a hybrid sensor covered with an additional pane with another uncovered in the aim of improvin... View full abstract»

The present paper aims at characterizing the hydration behavior in the case of dioctahedral smectite with different location charge (i.e. montmorillonite SWy-2 and beidellite SbId-1) exchanged by heavy metals cations characterized by different valence (Ba2+ and Cs+) generally coming from industrial waste and wastewater solution. The study was performed basing on the quantitat... View full abstract»