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266 articles for “ARM”
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Control System for Off-Grid Multiple Hybrid Renewables
Abstract: This article focuses on designing a renewable energy control system for a household self-consumption network, combining solar and hydroelectric energy to meet the energy demand of a standard home. We conducted an exhaustive analysis of each energy source, evaluating parameters such as solar radiation, optimal tilt of photovoltaic panels, and conversion system efficiency. Equipment for this system is selected based on the characteristics obtained in the study. Hydroelectric energy is …
Published in Journal of Alternate Energy Sources & Technologies · Vol. 15, Issue 3, 2024 · pp. 20–34 Read article
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Analysis of the Output Power in Offshore Bladeless Vibrational Wind Turbines
Abstract: This work focuses on studying and analyzing the power generation in offshore bladeless vibrational wind turbines. In previous work, we developed detailed research about the vibrational wind turbine design and configuration; in this new work, we analyze the energy supply from this type of turbine to achieve a better understanding of the behavior and potential of bladeless vibrational wind turbines (BVWT) as an additional power source in offshore wind farms. …
Published in Journal of Offshore Structure and Technology · Vol. 11, Issue 3, 2024 · pp. 12–23 Read article
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Vibrational Wind Turbine Design
Abstract: This work focuses on the study and analysis of bladeless wind turbines (BWT) as an alternative to operating vertical-axis wind turbines (VAWT) and horizontal-axis wind turbines (HAWT). A mathematical analysis of the BWT oscillation under wind force allows the development of specific mathematical expressions for the oscillation speed and BWT mast displacement at any height. The oscillation movement is submitted to a Strouhal constant number condition, resulting in an algorithm …
Published in Journal of Offshore Structure and Technology · Vol. 11, Issue 3, 2024 · pp. 32–45 Read article
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Turbulence Exploitation in Offshore Wind Farms: Improvement in Generated Power
Abstract: The limited space available for wind energy projects highlights the importance of improving the efficiency of wind farms, like the exploitation of turbulent wakes. In this work, we analyze the available energy associated with the turbulent wakes generated by offshore wind turbines at various downstream distances using a computational fluid dynamics (CFD) program (Autodesk). Classical wind conditions for offshore wind farms are established for the probability distribution of wind speed, …
Published in Journal of Offshore Structure and Technology · Vol. 12, Issue 2, 2025 · pp. 22–35 Read article
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Modelling and Simulation of a Combined System Geothermal Binary Plant and Parabolic Solar Concentrator
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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THERMAL DISSIPATION SYSTEM APPLIED TO LED DEVICES
Abstract: A thermal dissipation system, based on an aluminum case LED lamp system encapsulated in a PCM device, has been used to reduce LED device temperature, improving thermal performance of the LED unit. Three heating rates have been tested, low (0.6ºC/s), medium (1.3ºC/s) and high (1.8ºC/s). The system has been tested in an experimental prototype at reduced scale, showing a maximum reduction of temperature from 177.5º C to 56º C for …
Published in Journal of Thermal Engineering and Applications · Vol. 8, Issue 3, 2021 · pp. 1–18 Read article
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SIMULATION OF THE PERFORMANCE OF PV/T (PV-PCM) SYSTEMS IN TRANSIENT STATE
Abstract: The paper describes the analysis of the thermal performance of a PCM unit attached to a PV panel configuring a PV/T system. Thermal performance has been analyzed from the transient process point of view considering the temperature evolution of the PCM with time dependent on ambient temperature and solar radiation. A specific algorithm for determining the time evolution of the PCM temperature has been developed. The model uses the DERIVE …
Published in Journal of Thermal Engineering and Applications · Vol. 10, Issue 1, 2023 · pp. 1–13 Read article
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Environmental Impact Reduction by Using Smart Household
Abstract: In this paper, we study the environmental impact reduction due to the application of intelligent protocols to household heating. The study analyzes the reduction in greenhouse gases (GHG) emissions associated with lower energy consumption in heating detached and semi-detached houses and blocks of apartments. The new protocol bases its operation on a more efficient heating process, which reduces the operational time of the heating source, commonly heating equipment powered by …
Published in Journal of Thermal Engineering and Applications · Vol. 10, Issue 2, 2023 · pp. 10–23 Read article
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Application of Statistical Method to Determine Lithium Battery Capacity for Electric Vehicles
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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Simulation of The Performance of Li-Ion Batteries for Electric Vehicles
Abstract: In this work, a simulation process, focused to study the performance of Li-ion batteries under variable driving conditions has been developed. The simulation has been tested for a battery of 100 kWh, 400 V and 250 Ah, in an electric vehicle operating in pure electric mode (EV). The results have been compared to the European standard NEDC and WLTP cycles, producing a range of 196 km for the NEDC cycle …
Published in Journal of Automobile Engineering and Applications · Vol. 7, Issue 3, 2020 · pp. 1–15 Read article
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Reduction of Electric Vehicle Driving Range Due to Battery Capacity Fading
Abstract: This paper is mainly focused to the estimation of the reduction of the driving range in electric vehicles due to battery capacity fading as a consequence of the aging effects with cycling. A scale model reproducing the real driving conditions in electric vehicles has been used to develop a simulation process to evaluate the incidence of the cycling on the battery capacity fading. The model on which the simulation has …
Published in Journal of Automobile Engineering and Applications · Vol. 8, Issue 2, 2021 · pp. 1–16 Read article
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BATTERY/SUPERCAPACITOR HYBRID SYSTEM FOR ELECTRIC VEHICLES
Abstract: The paper is focused to the design and development of a new hybrid system to power electric vehicles. The system is made up of a conventional lithium battery that is used to propel the vehicle when there is no acceleration or the acceleration and power demand are low or moderate, and a supercapacitor that powers the electric vehicle at high power demand periods or when the acceleration is relevant. The …
Published in Journal of Automobile Engineering and Applications · Vol. 9, Issue 2, 2022 · pp. 20–42 Read article
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INFLUENCE OF CLIMATIC CHANGES ONTO THE PERFORMANCE OF ELECTRIC VEHICLES: APPLICATION TO DRIVING RANGE
Abstract: The paper has the goal of developing a methodological process to predict electric vehicle driving range under the influence of sudden temperature changes in intercity routes due to variable climatic conditions. The model is based on the combined effects of discharge rate and temperature changes on the performance of a lithium battery; the model predicts the driving range using the dynamic driving conditions to determine the Depth-Of-Discharge (DOD) at any …
Published in Journal of Automobile Engineering and Applications · Vol. 9, Issue 2, 2022 · pp. 43–58 Read article
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ADVANCED METHOD TO CALCULATE REAL DRIVING RANGE FOR ELECTRIC VEHICLES IN INTERCITY ROUTES
Abstract: This paper describes an online method to calculate real driving range for electric vehicles when operating in intercity routes. The method uses specific algorithms for dynamic conditions based on real driving conditions adapting the calculation method to the characteristics of the route and to the way of driving; electric vehicle characteristics are also taken into consideration for the driving range calculation. The method has been compared to the WLTP protocol …
Published in Journal of Automobile Engineering and Applications · Vol. 9, Issue 3, 2022 · pp. 24–42 Read article
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FUEL CELL-PV HYBRID SYSTEM FOR EVs
Abstract: This paper studies and analyzes a hybrid system consisting of a fuel cell unit and flexible photovoltaic panels to power electric vehicles. Hydrogen in a storage tank powers the fuel cell; the tank recharges by an onboard electrolyzer connected to the photovoltaic panels. Fuel cell unit operates in a closed loop to enhance efficiency and to avoid water waste and oxygen pollution with ambient gasses. A distilled water tank, connected …
Published in Journal of Automobile Engineering and Applications · Vol. 10, Issue 3, 2023 · pp. 20–30 Read article
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Analysis of The Performance of A PV/PCM System in Variable Solar Radiation Conditions
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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Effects of Rotor-Blade Deformation onto Performance of Domestic Wind Turbines
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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A SIMULATION STUDY OF THE EFFICIENCY OF HIGH VOLTAGE α-Si STAND-ALONE PV INSTALLATIONS
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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Power loss by blade deflection in flexible rotor wind turbines
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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Simulation of a Renewable Energy Hybrid MicroHydro-Wind-PV-Solar System for Electric Generation
Abstract: This project is based on the development of a renewable energy hybrid tri-system made up of a photovoltaic device, a small wind turbine and a micro hydraulic turbine to generate electricity in places where these renewable energy resources are available. The system pursues the reduction of energy dependence on local electric network as well as the greenhouse gases emission. The project will be theoretically modelled and verified in a small …
Published in Journal of Alternate Energy Sources & Technologies · Vol. 13, Issue 2, 2022 · pp. 37–50 Read article