STM Journals Peer-reviewed research from Consortium e-Learning Network

35 publications

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    Performance test to determine electric vehicle driving range

    By Carlos Armenta-Deu, Luis Gª-Arranz

    Abstract: A new method to estimate the driving range in electric vehicles has been developed. The new method is based on full electric energy supply from a unique lithium-ion battery that equips the electric vehicle. The simulation method includes engine consumption as well as auxiliary systems and accessories that are currently powered by a servicing lead-acid battery. The modeling uses an AC/DC double electric circuit to represent the AC electric engine …

    Published in Journal of Mechatronics and Automation · Vol. 8, Issue 2, 2021 · pp. 10–20 Read article

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    PV System Performance in Variable Climatic Conditions

    By Carlos Armenta-Deu, Sergio Segovia

    Abstract: This paper is focused to the study of the panel temperature operating under different climatic conditions; to this goal a detailed model has been developed to estimate the response of the panel temperature to various scenarios. The model has been designed based on energy balance, where temperature of the panel is estimated applying heat exchange processes with the environment, mainly convection and radiation, considering the effects of ambient temperature, wind …

    Published in Journal of Energy, Environment & Carbon Credits · Vol. 11, Issue 2, 2021 · pp. 11–27 Read article

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    Power loss by blade deflection in flexible rotor wind turbines

    By Carlos Armenta-Deu, Antoine Renoud-Grappin

    Abstract: Effects of deflection onto the performance of small wind turbines with flexible rotor-blades have been studied and analysed. The goal of the study has been the evaluation of the wind turbine output power loss due to angular deflection because of bending effects caused by gravity. Wind turbine blades have been deformed under constant load at the tip of the blade for periods up to 40 days. Deformation process has been …

    Published in Journal of Alternate Energy Sources & Technologies · Vol. 12, Issue 3, 2021 · pp. 13–29 Read article

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    A SIMULATION STUDY OF THE EFFICIENCY OF HIGH VOLTAGE α-Si STAND-ALONE PV INSTALLATIONS

    By Carlos Armenta-Deu, David Arroyo del Saz

    Abstract: The paper analyzes different configurations, direct-PV, PV-battery, either with PWM or MPPregulator, and hybrid-PV, of stand-alone PV installation operating with high voltage α-Si panels thatsupplies energy to a DC-AC external circuit. Global efficiency is determined as a function of voltageconversion ratio and individual element efficiency. The paper concludes that direct-PV is the mostefficient mode with average performance ratio (PR) of 92.2% followed by PV-battery with MPPT,68.3% of efficiency, and PWM …

    Published in Journal of Alternate Energy Sources & Technologies · Vol. 12, Issue 2, 2021 · pp. 1–11 Read article

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    Modelling and Simulation of a Combined System Geothermal Binary Plant and Parabolic Solar Concentrator

    By Carlos Armenta-Deu

    Abstract: The present work describes a new prototype that uses the concentrated solar radiation to improve the performance of geothermal power plants. Current methods of heat recovering have been used to reduce the amount of fossil fuel used to produce vapor or to increase gas pressure and temperature, depending on the type of system; however, concentrated solar energy is an unknown resource that may help to increase vapor production at a …

    Published in Journal of Thermal Engineering and Applications · Vol. 8, Issue 1, 2021 · pp. 23–46 Read article

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    Performance of Combined PV-Inverter System: Use of Amorphous and Crystalline Panels

    By Carlos Armenta-Deu

    Abstract: This paper is aimed at analyzing the performance of a combined PV-inverter system connected to an external load using either amorphous or crystalline photovoltaic modules. The analysis is based on previous theoretical analysis that uses the efficiency of the PV panel and of the DC/AC inverter as a key parameter. Different configurations using the same energy resource have been simulated to determine the efficiency of the PV panel, DC/AC inverter, …

    Published in Journal of Energy, Environment & Carbon Credits · Vol. 11, Issue 1, 2021 · pp. 6–21 Read article

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    Effects of Rotor-Blade Deformation onto Performance of Domestic Wind Turbines

    By Carlos Armenta-Deu

    Abstract: Paper is focused on the influence that blade deformations by torsion and bending due to drag, lift, and gravitational effects has on the performance of small wind turbines. A blade model of stiff finite elements connected by rotating junctions is used. Mechanical deformations are simulated by controlled gravity and torsional forces, and their effects are measured through the response of the wind turbine. Tests have been run before and after …

    Published in Journal of Alternate Energy Sources & Technologies · Vol. 12, Issue 1, 2021 · pp. 27–42 Read article

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    Analysis of The Performance of A PV/PCM System in Variable Solar Radiation Conditions

    By Carlos Armenta-Deu

    Abstract: This paper studies the performance of a PV/PCM system operating at variable solar radiation conditions. The system has been tested for six different solar radiation levels, from 250 W/m2 to 950 W/m2 determining the steady-state temperature for every case. An algorithm has been developed to predict the steady-state temperature. This prediction has produced values within 97% accuracy of experimental data. A reduction of temperature up to 18.9ºC has been achieved. …

    Published in Journal of Alternate Energy Sources & Technologies · Vol. 12, Issue 1, 2021 · pp. 1–20 Read article

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    Seasonal Variation of Electric Vehicles Autonomy: Application to AC/DC Dual Voltage Operation

    By Carlos Armenta-Deu, M. Hanako Olmedilla-Ishishi

    Abstract: In this work, a study to predict battery performance and autonomy for a dual type of electric engine, 480 VAC and 360 VDC, has been developed. The study has been conducted in vehicles of mass between 1000 and 3000 kg with battery capacity in the range of 40 to 100 kWh. The process has been simulated using reference values and modeled for specific driving conditions. The simulation has been developed …

    Published in Journal of Mechatronics and Automation · Vol. 7, Issue 3, 2020 · pp. 1–15 Read article

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    Modeling Cogeneration System in Shallow Geothermal Installations

    By Leticia Bottazzi, Carlos Armenta-Deu

    Abstract: This paper presents a theoretical modeling of a cogeneration system using multiple heat exchangers and thermoelectric generator. The modeled system, designed for shallow geothermal energy, is a closed piping unit containing water as heat transfer fluid that circulates through a closed loop releasing thermal energy at the surface for heating and sanitary hot water. In addition, a Peltier cells array is attached to the piping system to generate electricity, thus …

    Published in Journal of Alternate Energy Sources & Technologies · Vol. 11, Issue 3, 2020 · pp. 13–23 Read article

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    Application of Statistical Method to Determine Lithium Battery Capacity for Electric Vehicles

    By Carlos Armenta-Deu, Juan Pedro Carriquiry

    Abstract: In this paper, an empirical method, based on statistical analysis, is proposed to determine correction factor for Li-Po battery capacity calculation. The method uses statistical analysis for the estimation of the battery capacity, using a capacity correction factor previously determined. The method takes into account the effects that the discharge current has on (the) battery capacity. The method has been tested in two types of lithium batteries, Li-ion and LiPo …

    Published in Journal of Automobile Engineering and Applications · Vol. 7, Issue 2, 2020 · pp. 25–35 Read article

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    SYMMETRY AND ASYMMETRY MODEL FOR THERMAL CONDUCTIVITY IN POROUS MEDIA

    By Carlos Armenta-Deu, Leticia Bottazzi

    Abstract: This paper focuses on determining thermal conductivity in porous media using symmetry and asymmetry models. Since porous media are not uniform and homogeneous in most of the cases, anisotropy must be taken into account, what derives in the application of an asymmetry model as thermal gradients are not equal in all directions. The paper demonstrates that, under certain conditions, isotropic conditions, therefore, symmetry model can be applied to non-homogeneous or …

    Published in Journal of Geotechnical Engineering · Vol. 7, Issue 2, 2020 · pp. 38–51 Read article

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    Hybrid PV-PCM System to Increase Efficiency

    By Carlos Armenta-Deu

    Abstract: AbstractThis paper studies a hybrid design for the photovoltaic industry made up of a conventional photovoltaic panel and a Phase Change Material (PCM) to increase the efficiency of the panel as well as to generate thermal energy. The system has been based on thermal transfer from the PV panel to the PCM through direct contact, thus reducing the operating temperature of the panel and improving its efficiency. The system operates …

    Published in Journal of Alternate Energy Sources & Technologies · Vol. 11, Issue 2, 2020 · pp. 15–26 Read article

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    Thermal and Thermoelectric Generation Using Geothermal Energy Extraction Through Cogeneration System

    By Carlos Armenta-Deu, Leticia Bottazzi

    Abstract: The manuscript has focused on the evaluation of the improvement of energy efficiency in using geothermal energy for heat and electricity generation through additional thermoelectric production to conventional heat transfer processes. The proposed system uses Peltier rings made up of a serial and parallel Peltier cells grouping, as part of the upward and downward ducts that connect the geothermal heat exchanger and the surface heating system. The new system can …

    Published in Journal of Alternate Energy Sources & Technologies · Vol. 11, Issue 1, 2020 · pp. 58–71 Read article

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    VARIATION OF THERMAL CONDUCTIVITY WITH POROSITY

    By Carlos Armenta-Deu, Leticia Bottazzi

    Abstract: Thermal conductivity in porous media as a function of the grain size and porosity has been studied establishing a relation between these two parameters. The study has been developed for a homogeneous porous medium with grain size in a very close range of particle diameter. The study has been extended from very small particles to large ones, to cover most of the real grain size. As a result of this …

    Published in Journal of Geotechnical Engineering · Vol. 7, Issue 1, 2020 · pp. 47–58 Read article

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