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In this paper, the different types of concentrating solar power plants are illustrated with the materials employed for the matter, the heat transfer fluids categories employed, in addition to the thermal storage possibilities that all depend on the working temperature of each plant. Furthermore, the accelerated ageing tests operated on these materials are discussed.
Over the ages, energy has been provided by oil, natural gas, nuclear energy, wood and coke. All these sources provoke pollution problems and they are limited. To overcome these problems, the renewable energy production must be hugely increased, in particular, wind energy. This latter is produced by using wind turbines. The blades play a vital and chief role in the wind turbines where their efficiency...
The manuscript presents an analysis of the aerodynamic behavior of a Horizontal Axis Wind Turbine (HAWT) using a new approach to evaluate the fluid mechanics parameters. Based on the Blade Element Momentum theory (BEM), this analysis leads to determine a detailed algorithm containing all steps needed to achieve an optimal design including the correction factors in order to straighten the weaknesses...
Proton exchange membrane fuel cells (PEMFCs) underwent a huge development. The advantages of this type of fuel cell includes low operating temperature, quick start-up, planar configuration and easier sealing due to the use of a solid electrolyte. However performance remains one of the most important issues in commercialization of polymer exchange membrane fuel cell PEMFC. There are many factors which...
In this paper we investigate the mechanical performances of a new material for wind turbine blade. This later is a composite based on vegetable fiber performed from Hemp plant. A numerical method is used to evaluate the evolution of the blade stresses and deformation. The Hemp blade stresses and deformation are compared with the blade Aramid fiber and Carbon fiber. The results show that Hemp fibre...
In this study the gas permeability and internal current through hydrated Nafion membranes are investigated using numerical simulation developed under CFD software. The results showed that the gas permeability and internal current increase, while the solubility of gases (O2 and H2) decreases with increasing water content and temperature particularly for thinner membrane. The results also show that...
Nowadays, the proton exchange membrane fuel cells (PEMFCs) underwent a huge development. But durability remains one of the most important issues in commercialization of polymer exchange membrane fuel cell PEMFC. PEMFC has the potential to replace the vehicle's internal combustion engine. Specifically, with the fast-start capability and low temperature operation, the polymer electrolyte membrane (PEM)...
The manuscript presents a development of a semi empirical model of performance of PEMFC using numerical simulations developed under CFD software. This semi empirical model describes the voltage-current behavior and allows calculate internal currents and fuel crossover for PEMFC system in which the voltage naturally reduces the OCV. The obtained results show that the internal currents and fuel crossover...
A multi-cell model based on a prototypical, IP-SOFC (integrated-planar solid oxide fuel cell) stack design was constructed in this study to perform comprehensive thermal stress analyses and to calculate the probability of survival. The temperature profiles generated by a thermo-electrochemical model were applied to calculate the thermal stress distributions in a multiple-cell module. The effect of...
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