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This study investigates a model based on thermodynamic concept to improve the performance of the power block of the concentrated solar power (CSP) systems. The analytical solution of this model established by Aspen HYSYS, Engineering Equation Solver (EES) software programs and Matlab software programming system (Code and Simulink package) to study its performance. The model consists of normal combined...
In this paper a steady-state natural convection was numerically simulated in horizontal rectangular cavity with a sinusoidal bottom wavy wall. This new type of surface rarely studied and investigated. The vertical walls are insulated while the bottom surface maintained to higher temperature than the top surface. In this numerical simulation that based on our elaborated code. the investigated parameters...
The main of this work is to analyze the performance of a wood solar dryer functioning under a Moroccan climate. A mathematical model based on actual climate data of Rabat city is used to investigate theoretically the drying wood process. The influence of the principal operating parameters (wood thickness, wood density, air temperature and air velocity) on the drying time is studied. The results obtained...
This paper presents the study of the seawater desalination process, by humidification-dehumidification, via an agricultural greenhouse with solar collectors.
Energy demand is an important factor; it represents the industrial development of a country. In this work, we use ARIMA (Auto Regressive Integrated Moving Average) to model Morocco's energy demand. The model is validated by various statistical approaches such as the determination coefficient, R square, R-square stationary. Additionally, the performance of the model is assessed using mean absolute...
The modeling and the simulation of triple junction solar cells had been addressed in earlier research works. But there are many new cells with parameters not released by the manufacturers yet. The aim of this paper is to simulate the behavior of a C3MJ+ triple-junction solar cell by determining its J-V characteristics curve and its P-V curve. The maximum voltage, current density and power will be...
Herein, we performed a comparative study of bulk heterojunction, bilayer architectures of thin films based MEH-PPV and PCBM dissolved in chlorobenzene. This study aims to investigate the impact of deposition of successive layers on optical characteristics of the active layer. The films were examined using UV-absorption, Photoluminescence X-ray diffraction and Scanning electron microscopy SEM.
Command and control in real time of renewable energy are a fast-growing trend. The development of communication platform uses energy management software (Power studio technology) as a basis design for an overall system. The proposed prototype constructs Power Quality Analyzer. The main central control system will acquire data from the remote renewable energy system. All necessary monitor data include...
This paper deals with a comparative study between Proportional Integral (PI) and Sliding Mode in control of a doubly fed induction generator to feed power to the grid. Modeling of the DFIG in d-q frame reference is presented and the field-oriented strategy is applied. We use PI and sliding mode techniques respectively to control the rotor side converter (RSC) and the grid side converter (GSC). Simulation...
Being a high-rise building, the optimization of an office tower consumption is a priority. The application of energy efficiency measures to the baseline building shows an energy reduction of 56% in the energy efficient building model. Then, the integration of the photovoltaic double-glazing to the envelope of this model reduces its consumption by 15%, turning it into positive energy building model...
Natural ventilation offers opportunities for reducing cooling energy-demand at low cost for the climate Saharan, and can create a comfortable and healthy indoor environment, and save energy used in the mechanical ventilation systems, have an important role on the balance between heating and cooling needs, It is also necessary to study the possible combinations with natural resources, this natural...
V-doped TiO2 nanoparticles (NPs) was synthesized by a sol-gel hydrolysis method using titanium butoxide (Ti(OBu)4) and vanadyl acetylacetonate (VO(acac)2) as a precursor and dopant, respectively. The effects of different V : Ti ratios on the crystal structure, band gap energy and photocatalytic activity have been investigated. The photocatalytic activity of V-doped TiO2 NPs was evaluated using UV-vis...
Cellulose acetate CA was produced from paper wastes by acetylation reactions with glacial acetic acid, concentrated H2SO4, and acetic anhydride. The degree of substitution (DS) values can be controlled by the acetylation time leading to biodegradable cellulose derivatives, which a necessary characteristic is considering environmental and economic aspects. Different acetylation times were analyzed...
ZnFe2O4 powders and thin films are successfully synthetized using sol-gel transition based on hydrolysis-polycondensation of zinc and iron alkoxides. The structure and morphology of ZnFe2O4 samples were studied by X-ray diffraction (XRD), Transmission Electron Microscopy (TEM) and Atomic Force Microscopy (AFM). The photocatalytic properties of the obtained ZnFe2O4 samples were investigated to determine...
CZTS thin films were prepared by simple Sol-gel method. CZTS sol-gel mixture contains tin chloride, copper acetate, zinc acetate and thiourea as a source of sulfur. CZTS solution was then deposited on molybdenum coated glass substrates. The prepared thin films were annealed at 540 °C in sulfur atmosphere for one hour. CZTS films showed good crystalline quality and optical properties that depend on...
Wet chemical synthesis and characterizations of quaternary chalcogenide Cu2ZnSnS4 (CZTS) nanocrystals, as an alternative solar absorber material to conventional quaternary CuInxGa(1−x)S2 (CIGS), is given in detailed. Dodecanethiol and oleylamine are used as hot organic solvents and capping ligands, as for oleic acid is used with dodecanethiol to control the nanocrystals morphology. Two kinds of metal...
Morphological properties of two p-type semiconductors, used separately with fullerene: MEH-PPV and the commonly used P3HT, are investigated in order to study their influence on optical and Photoconductivity properties of organic thin films based on MEH-PPV/P3HT, separately, with and without PCBM. The aim is to better understand the charge carriers mechanisms inside the polymers and the effect of PCBM...
In this paper we are interested in modeling and control design of doubly fed induction generator (DFIG) used in wind energy conversion systems (WECs) connected to the electrical network through back-to-back converter. The doubly fed induction generator (DFIG) is the most exploited to generate power from the wind, it provides the benefits of variable speed operation by improved power quality, increased...
This paper addresses the modeling and control of the grid connected photovoltaic system. The system contains a PV panel that converts irradiation to electrical power, a boost converter which increases the voltage of the PV, and a grid connected inverter to convert the DC power to three Phases AC power. MPPT control is developed in order to track the maximum power provided by the photovoltaic generator...
In the light of the emissions associated with fossil fuel combustion and their associated health and environmental impacts, natural gas is becoming increasingly attractive when compared with other fuels. Natural gas is a mixture of methane and other gases, which include natural gas liquid (NGL). This paper presents modeling and optimization of the distillation column of NGL fractions, especially the...
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