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The need to maintain instantaneous equilibrium between supply and demand is a major constraint in the electric power system operations. Energy storage has the ability to solve this issue by allowing energy to be stored and released upon demand. Pumped hydro storage is portrayed as a viable resource that is being mostly used for storing energy. It is also considered one of best storage option that...
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...
The extreme conditions of desert locations put a lot of stress on the components of CSP systems. Solar reflectors, in particular, are sensitive to soiling and abrasion from sand and dust and might see their ability to reflect and concentrate light compromised. Whereas soiling is usually reversible with cleaning, the abrasion of the mirrors' surface is non-reversible and lead to a permanent loss in...
This work is devoted to the study of a thermoacoustic Swift-Backhaus engine, composed of a porous medium regenerator and a resonator consisting of an annular loop and of a linear portion. This machine has finally attracted the attention of researchers to create industrial applications of renewable energies. This last stage can only be done after an improvement and an optimization of certain components...
In Concentrated Solar Power (CSP) application, top coatings are of tremendous importance as a way to protect the reflective layers form degradation and conserve the efficiency and durability of the mirrors. The choice of Al2O3 as a top-protective coating for CSP reflectors is based on its high stability, hardness and transparency. In this study, high quality and stable CSP first-surface silvered thick...
One of the most critical issues facing solar plants is to ensure an efficient monitoring of installations, such as localizing dust or broken panels. Filming with robots or drones is widely used, but it is difficult to exploit directly the captured videos. In order to facilitate the monitoring task, we propose a technique to prepare a large panoramic image view of the desired area from the captured...
The current energy policy recommends the subject of energy efficiency as a master question for the prospective years. The establishment of “smart meters” to measure remotely and in real time consumption is usually suggested as a solution for decreasing power consumption. The goal of this analysis is to distinguish the various services of new generations of smart meters emphasizing advantages that...
Various players in the field of energy give a lot of importance to the evaluation of reliability of their electrical networks. Following our literature review, several limitations need to be pointed out. In this paper, we will present an accurate method of decision making based on constraint programming. Our main contributions are i) to propose a new generalized constraint based formalization of the...
Optimal unit sizing of generation units in small off-grid systems is an important aspect to minimize total annual cost. This can be applied to wind, photovoltaic (PV), and hybrid wind-PV power generating systems to meet power demand for a residential home constructed at a specific site located in remote hilly areas in Turkey's northwest Black Sea coast where no grid extension is available. It is obvious...
Depending on applied criteria, sizing optimization process of renewable energy plants produces different optimal dimensions of the system components. This work presents a sizing algorithm of hybrid solar/diesel/battery system; where the battery depth of discharge (DOD) range setting is considered as a key to guarantee low overall system cost and minimum CO2 emission. Different DOD range setting values...
The shade effect of a rooftop photovoltaic (PV) collector on a roof is usually ignored in building energy simulation in Transient System Simulation (TRNSYS) software. This disregard is due to either the unavailability of a suitable shading component in the simulation software or to an assumption that the shade on opaque surfaces, such as roofs, has small impact on the indoor temperature and the subsequent...
This work introduces a new approach to solve the redundancy allocation problem (RAP) by including the optimization of carbon footprint for multi-state systems (MSS). Each component of such systems is supposed to have a carbon emission factor to assess its impact on the environment. Therefore, it is convenient to integrate renewable energy into production subsystems by considering the emission factor...
Distillation is the most used separation operation unit in chemical industries; the high consumption of energy is the major disadvantage of this process that is unable to reach a high level of purity of bioethanol. The aim of this work is to optimize the operating energy and cost for distillation column by controlling the operating conditions. A sensitivity studies were performed by response surface...
This article presents a study aimed at the determination of the stresses and deformations for a planetary gear of a speed multiplier of a wind turbine. These planetary gear are made by using part and assembly design module in Pro/ENGINEER 4.0 M220 software, while the analysis is done in ANSYS V15 software to evaluate the constraints and the deformations using the finite element method. Optimization...
In the present work we uses the lattice Boltzmann method (LBM) to simulate the heat transfer by natural convection in a square cavity filled by air and heated locally from below θ = 1 by a heated portion of length ℓ = H/4 placed in the center of the wall. One of the vertical walls has a cold portion θ = 0, while the other walls are adiabatic. This cavity simulates a living space with under floor heating...
Marine energy is one of the most exciting emerging form of renewable energy. Tidal turbines are used to extract this energy and installed on the seabed at locations with catastrophic loading. This investigation focuses on the numerical simulation of the damage progressive in tidal turbine used for marine energy application under impact loadings. The optimal design and the dynamic behavior of the turbine...
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...
Integration of stoichiometric molybdenum trioxide (MoO3−x) as an effective hole transport layer (HTL) in solar cells is expected to reduce fabrication cost by eliminating the high temperature processes while maintaining high conversion efficiency. In this work we performed a systematic study to extract the electronic properties of vapor-phase deposited MoO3−x thin film and MoO3−x/crystalline silicon...
In this work, a three dimensional laminar mixed convection of nanofluid flow in horizontal concentric annulus is investigated numerically based on single-phase fluid approach. The constant heat flux is applied on the outer cylinder, while the inner cylinder is adiabatic. The annular space is filled with Silver-Water nanofluid. The governing equations are discretized using the finite-volume method...
In this paper, we are studying the effect of soiling on High Concentration Photovoltaic (HCPV) modules performance. We evaluate the electrical characteristics such as power and energy depending of the variation of dust thickness. The result indicated a 1,610 µm thick fouling layer has decreased the modules performance by 7.64 % for a period of one month. The study is also investigating the effect...
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