Browsing Journal of Energy Engineering by Issue Date
Now showing items 1-20 of 1390
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Comparative Study of Buoy-Actuated Energy-Harvesting Devices for Submersible Sensors
(ASCE, 10/1/2020 )Continuous electrical power supplies are crucial for the success of deep-sea missions given the need for power to energize sensors, actuators, or light sources to monitor activities in deep murky waters. Therefore, viable ... -
Energy, Exergy, and Parametric Analysis of Simple and Recuperative Organic Rankine Cycles Using a Gas Turbine–Based Combined Cycle
(ASCE, 10/1/2020 )In this study, simple and recuperative organic Rankine cycles (ORCs) were designed as the bottoming cycle to a simple gas turbine. After the design, the performance of the ORC engines was analyzed for varying turbine inlet ... -
Numerical Study on the Stress Concentration Phenomenon in the Membranes of PEMFCs in an Assembled State
(ASCE, 10/1/2020 )Mechanical damage to the membrane of the electrode assembly (MEA) in a proton electrolyte membrane fuel cell (PEMFC) is one of the main factors influencing its durability. In this study, a two-dimensional finite-element ... -
Effects of Water Injection on Performance and Exhaust Emissions of SI Engine with Y2O3-Coated Piston
(ASCE, 10/1/2020 )One of the most critical pollutant emissions in spark ignition (SI) engines is hydrocarbon (HC) emissions, which are partially incomplete combustion products. In this study, the upper surface of a piston was covered with ... -
Performance of Parallel, Interdigitated, and Serpentine Flow Field PEM Fuel Cells with Straight or Wavelike Channels
(ASCE, 10/1/2020 )This work used a three-dimensional, two-phase, and nonisothermal model to compare performances of proton exchange membrane (PEM) fuel cells with a parallel, interdigitated, or serpentine flow field when wavelike gas channels ... -
Uncoupling Characteristics of Temperature and Relative Humidity Distribution in a Commercial-Size Polymer Electrolyte Membrane Fuel Cell
(ASCE, 10/1/2020 )The microenvironment of the electrodes in a polymer electrolyte membrane fuel cell (PEMFC) is critical to its performance and is significantly affected by the distribution of water and heat along the cell. In this work, ... -
Design and Optimization of Ellipsoidal Windows for Concentrated Solar Irradiation
(ASCE, 10/1/2020 )This work presents a numerical study on transmission performance of ellipsoidal windows used in receivers under concentrated solar irradiation. The Monte Carlo ray tracing method is used to analyze the transmission of ... -
Impact Analysis of Bioclimatic Strategies on the Thermoenergetic Performance of a Pilot Plant in Southern Brazil
(ASCE, 10/1/2020 )Natural resources in the current scenario of energy production and consumption demands appropriate management. Due to increasing urbanization worldwide, energy consumption optimization has become fundamental, including in ... -
Biodiesel Spray Characteristics and a CFD Simulation Study of Injection Timing Effects on the Combustion Process in a Biodiesel-Fueled, Direct-Injection Rotary Engine
(ASCE, 10/1/2020 )Energy conservation is important in this modern era because of its high demand in transportation systems coupled with the depletion of fossil fuels. Biodiesel is thus an alternative fuel to replace conventional diesel. ... -
Relationship between Electric-Power Sector Development and Socioeconomic Parameters: Statistical Analysis Approach
(ASCE, 10/1/2020 )Electric power is a critical commodity of the modern world where demand for electricity has been increasing significantly in the last decades, and it is expected to keep increasing in the future. Several socioeconomic ... -
Comparative Assessment of the Impact of Water Addition either to the Intake Air or in Diesel Emulsion on the Performance and Emissions of a HDDI Diesel Engine
(ASCE, 10/1/2020 )A theoretical investigation is performed to comparatively evaluate the impact of water addition to the intake air (humidification) or in water-diesel fuel emulsion on the performance and emissions in a turbocharged (T/C), ... -
Numerical Modeling of a Darrieus Horizontal Axis Shallow-Water Turbine
(ASCE, 10/1/2020 )For decades, Darrieus turbines have shown their advantage over other turbines for providing hydropower. Most studies tend to be conducted with the turbine in its vertical axis configuration, while few have examined the ... -
Methodology to Estimate Road Grade Effects on Consumption and Emissions from a Light Commercial Vehicle Running on the WLTC Cycle
(ASCE, 10/1/2020 )A novel methodology is suggested in this study, with the aim of assessing the impact of the road grade on a vehicle’s performance and emissions. This methodology consists of creating multiple sinusoidal elevation profiles ... -
Fuzzy Control Based on IQPSO in Proton-Exchange Membrane Fuel-Cell Temperature System
(ASCE, 10/1/2020 )The proton-exchange membrane fuel cell (PEMFC) is the most promising fuel cell technology because of the high power density and fast start-up. However, PEMFCs have not yet been commercialized on a large scale due to many ... -
Model Predictive Control of a Piezoelectric Vortex-Induced Vibrations Energy Harvester
(ASCE, 10/1/2020 )In this paper, an optimal control method is proposed for a piezoelectric vortex-induced vibrations (VIV) energy harvester. The harvester comprises a blunt cylinder attached to the tip of a flexible beam. The beam is a ... -
Product Compositions from Sequential Biomass Pyrolysis and Gasification of Its Char Residue
(ASCE, 10/1/2020 )Sequential pyrolysis of biomass and gasification of the resultant char generate syngas. The Aspen Plus software was used to simulate a two-stage high-temperature cyclone pyrolysis and gasification of corn straw and rice ... -
Energetic and Exergetic Analyses of a Dual-Fuel Diesel Engine Run on Preheated Intake Biogas-Air Mixture and Oxygenated Pilot Fuels
(ASCE, 10/1/2020 )In the present study of energy and exergy, the raw biogas is chosen as the less reactive inducted renewable fuel in dual-fuel mode (DFM). Further, some crucial parameters like global fuel-air equivalence ratio (Φglobal), ... -
Numerical and Experimental Study by Quasi-Dimensional Modeling of Combustion and Emissions in Variable Compression Ratio High-Speed Spark-Ignition Engine
(ASCE, 10/1/2021)This work presents the development and use of a comprehensive, quasi-dimensional, two-zone combustion model aiming at predicting the combustion characteristics, performance, nitric oxide (NO), and carbon monoxide (CO) ... -
Differences of the Pore Structure and Methane Adsorption/Desorption between Vitrain and Durain of Low-Rank Coals: Case Study in the Huanglong Coalfield, Southern Ordos Basin, China
(ASCE, 10/1/2021)Coal reservoirs are highly heterogeneous, and different macrolithotypes of coal have differences in material composition and pore structure, resulting in different coalbed methane (CBM) adsorption/desorption performance ... -
Control-Oriented Modeling of Purging Process and Cold Start of Proton-Exchange Membrane Fuel Cell
(ASCE, 10/1/2021)The main purpose of the shutdown purge is to reduce the residual moisture inside the stack and improve the water storage capacity in the cold start process and thereby reduce icing damage. First, by establishing a fuel ...