The carbon dioxide (CO2) emissions from thermoelectric power plants contribute to global warming. Monoethanolamine (MEA) solution is the most widely used solvent for CO2 removal processes these with disadvantage that it expensive and corrosive at high concentrations. In this work, an experimental methodology developed fix operating flow ratio (L/G) ensures maximum absorption capacity of MEA solution. system prototype saturation technique are detailed. main parameters were amount (0.65 1.30...

To spread the use of Wind H-Darrieus turbines to electricity generation in urban or rural environments is necessary improve some its main drawbacks such as: aerodynamic efficiency, self-starting capability and torque fluctuations. The aims this study are enhance efficiency an turbine through wind tunnel tests combined using a 3D numerical Computational Fluid Dynamics (CFD). NREL S815 profile four modified versions were evaluated, including one with 19.2% increase thickness three...

In this paper, the design and performance of small Organic Rankine Cycle (ORC) coupled to parabolic trough solar collector (PTC) are showed. The system is analyzed using first second laws thermodynamics. This ORC designed provide 10 kWe for almost 18 hours every day also energy heat water. main components are: a) concentrators (PTC), b) thermal storage c) system, which uses R245fa as working fluid a radial turbine expander. operate in Temixco, city located at central region México. radiation...

Any hydraulic reaction turbine is installed with a draft tube that impacts widely the entire performance, on which its functions are as follows: drive flux in appropriate manner after it releases energy to runner; recover suction head by effect; and improve dynamic runner outlet. All these strongly linked geometric definition of tube. This article proposes parametrization analysis Francis Based parametric definition, changes proposed performance modeled computational fluid dynamics; boundary...

This paper presents the design, development and tests made to a fiber optic pressure sensor using multimodalinterference methodology (MMI) thus, we propose an alternative ones available which are limited byhigh robust environments where use of them is potential hazard (explosive gases, corrosion evenelectromagnetic fields). The range work for this 0 0.36 psi, arrangement used formed by laserdiode, sensing element, electronic amplifying circuit, data acquisition board computer. sensingelement...

The electricity generation process from fossil fuels is one of the sources CO2 emissions. post-combustion capture an alternative to minimize packed absorption column first unit process. In this study, values parameters were established reduce absorber-packed height using a simulator developed in work. was validated measurements laboratory-scale unit; simulations carried out with same operating conditions as and two different treated; coal natural gas. A combined-cycle power plant Mexico...

With the aim of improving performance vertical axis wind turbines, in this article, flow field and aerodynamic an H-rotor Darrieus turbine are computed using computational fluid dynamics. Specifically, power coefficient (Cp) different airfoil profile thicknesses was evaluated as a function tip-speed ratios (TSRs) speed. Four NREL S815 were evaluated, TSR varied from 0.6 to 2.25 speeds 6 8 m/s. As result, calculated for each ratios. It found that profile, Cp increases when thickness rise,...

On‐site power and mass flow rate measurements were conducted in a hydroelectric plant (Mexico). Mass was obtained using Gibson′s water hammer‐based method. A numerical counterpart carried out by the commercial CFD software, simulations performed to principal components of hydraulic turbine: runner draft tube. Inlet boundary conditions for from previous simulation spiral case. The computed results at runner′s outlet used conduct subsequent tube simulation. provided data compute torque...

Abstract Thermal stresses in a simplified steam turbine rotor model during cold startup are analyzed using finite element analysis (FEA). In order to validate the numerical model, an experimental array is developed which hollow cylinder heated with hot air external surface. At thick wall of cylinder, temperature distribution measured real time, while at same time algorithm computes thermal stresses. Additional computational fluid dynamics (CFD) calculations made obtain magnitudes velocity...

En muchos países la fasciolosis y paramfistomosis representan un grave problema para salud del sector pecuario. Colombia hay registros de ambas distomatosis en bovinos, mayoría trópico alto andino, las cuales generan pérdidas económicas anuales cercanas a 40 000 COP. El objetivo esta investigación fue determinar prevalencia vacunos hacienda La Candelaria, Caucasia (Colombia), presencia caracoles hospederos intermediarios. Para cumplirlo, se realizó estudio descriptivo corte transversal con...

Microgas turbines (MGT) are an alternative for small-scale energy production; however, their small size becomes a drawback since it enhances the heat transfer among components. Moreover, drives to temperature gradients which become higher during transient cycles like start-up. The influence of different start-up curves on and thermal stresses microgas turbine was investigated. Stationary rotational blades were numerically simulated using CFD FEM commercial codes. Conjugated cases solved...

Nowadays, different mechanical artificial sphincters can be found implanted in human beings, trying to overcome a deficiency the performance of natural one. However, they do not take into account anal sphincter’s (AS) dimensions, and autonomous response; also lack basic contraction relaxation properties. In this paper, by addressing AS behavior, an model designed with Matlab/SimMechanics is shown. The comprises bodies concentrated mass interconnected springs. mass–spring system arranged...

A numerical study of the flow and heat transfer on a rotating cylindrical cavity solving mass, momentum, energy equations is presented in this work. The describes influence Prandtl number critical state which contains cooling fluid. Problem studied includes numbers 0.001 < Pr > 15, aspect ratios 0.25 1, Reynolds Re 600. Differential have been discretised using finite differences method. results show tendency followed by as increases from 300 to 600; addition, emphasis values Rayleigh...

Gas turbine power and efficiency have direct relation with inlet gas temperature. However, high temperature could cause thermal damage to blade material. be cooled using the so-called film cooling technique which is necessary ensure material integrity. In cooling, air from compressor injected through internal ducts. The leaves ducts holes placed on surface, creating a surface. Operating conditions hole geometrical factors can influence effectiveness. Several investigations been conducted...

Hydraulic microturbines are an option to clean energy generation, small waterfalls may be used as source. Performance of these devices can affected due blade numbers both the nozzle and runner. In present work power hydraulic microturbine axial flow was calculated numerically varying number runner blades. The evaluated consists stator with eight blades a runner, varied using 6, 12, 14, 16 18 Numerical calculations were realized Computational Fluid Dynamics (CFD) based on finite volume...

In recent years, several investigations on hydraulic turbine draft tube performance have shown that the hydrodynamic flow field at runner outlet determines diffuser efficiency affecting overall of turbine. This field, for which principal characteristics are rate and inlet swirling intensity, is mostly developed turbines designed low head (high specific velocity) operated away from their best point. To identify factors responsible loosing draft- efficiency, correlations between pattern along...