Showing papers in "Energy Conversion and Management in 2009"

TL;DR: The most important variables affecting methyl ester yield during the transesterification reaction are the molar ratio of alcohol to vegetable oil and the reaction temperature as discussed by the authors, which is the commonly used alcohol in this process, due to its low cost.

TL;DR: In this paper, the authors develop new methods to model and control the aggregated power demand from a population of thermostatically controlled loads, with the goal of delivering services such as regulation and load following.

TL;DR: In this paper, the detailed fuel properties of bio-oils are discussed and discussed how these properties affect the utilization of Bio-Oils in terms of converting biomass to liquid fuels.

TL;DR: In this paper, the effects of the thermodynamic parameters on the ORC performance were examined, and the optimal performance of different working fluids was compared and analyzed under the same waste heat condition.

TL;DR: There are several thermo-chemical routes for biomass-based energy production, such as direct combustion, liquefaction, pyrolysis, supercritical water extraction, gasification, air-steam gasification and so on.

TL;DR: In this paper, a brief review on the main conversion processes of microalgae becoming energy is presented, and it can be considered as a substitute of fossil oil for offish and vegetable oils.

TL;DR: In this paper, the authors investigated the global potential and use of biomass energy and its contribution to the sustainable energy development by presenting its historical development, and the main objective of the present study is to investigate global potential, use, and contribution of the biomass energy.

TL;DR: In this paper, the authors provide an overview of control strategies for researchers, as well as of their current use in the field of load frequency control (LFC), and make various comparisons between these approaches, and the main advantages and disadvantages of the methods.

TL;DR: In this article, a new topology of cascaded multilevel inverter using a reduced number of switches, insulated gate driver circuits and voltage standing on switches is proposed, which results in reduction of installation area and cost and has simplicity of control system.

TL;DR: In this paper, the authors evaluate the value of integrating compressed air energy storage (CAES) into future sustainable energy systems with even higher shares of fluctuating renewable energy sources based on detailed energy system analyses in which the supply of complete national energy systems is calculated hour by hour in relation to the demands during a year.

TL;DR: In this paper, a new method is developed to estimate Weibull distribution parameters for wind energy applications, which is called power density (PD) method and it has simple formulation, it does not require binning and solving linear least square problem or iterative procedure.

TL;DR: In this article, a transesterification reaction by potassium hydroxide (KOH) catalytic and supercritical methanol methods obtaining for biodiesel has been conducted, where free fatty acids in the waste cooking oil are transesterified simultaneously in supercritical meta-hanol method.

TL;DR: In this paper, the current refuel valorization facilities as well as the future importance of biorefineries are reviewed. And the authors conclude that upgraded bio-oil from biomass pyrolysis can be used in vehicle engines as fuel.

TL;DR: In this paper, the grid connected photovoltaic park of C. Rokas SA in Sitia, Crete, is presented, and its performance is evaluated, and suitably monitored during 1 year, and the performance ratio and the various power losses (temperature, soiling, internal, network, power electronics, grid availability and interconnection) are calculated.

TL;DR: In this article, the authors calculated carbon and energy balances and costs of 14 different Fischer-Tropsch (FT) fuel production plants in 17 complete well-to-wheel (WTW) chains.

TL;DR: The main purpose of biomass gasification is the production of low or medium heating value gas which can be used as fuel gas in an internal combustion engine for power production as discussed by the authors, however, these technologies are an inefficient source of usable energy.

TL;DR: In this article, a thermoelectric waste heat energy recovery system for internal combustion engine automobiles, including gasoline vehicles and hybrid electric vehicles, is proposed and implemented, which directly converts the heat energy from automotive waste heat to electrical energy.

TL;DR: Wang et al. as mentioned in this paper presented four modeling techniques for the prediction of hourly cooling load in the building, including back propagation neural network (BPNN), RBFNN, and support vector machine (SVM).

TL;DR: A good knowledge on dynamic characteristics and energy performance of buildings using PCM is essential for building researchers and practitioners to better understand building temperature response characteristics and economic feasibility of using PCMs and take further proper actions to fully utilize PCMs to enhance indoor environmental quality and overall energy efficiency of buildings as mentioned in this paper.

TL;DR: This investigation elucidates the feasibility of applying chaotic particle swarm optimization (CPSO) algorithm to choose the suitable parameter combination for a SVR model and outperforms the other two models applying other algorithms, genetic algorithm (GA) and simulated annealing algorithm (SA).

TL;DR: In this article, the authors reviewed different generation methods, catalysts and operating conditions used to produce hydrogen using glycerol as a substrate, including steam reforming, autothermal reforming, aqueous-phase reforming and supercritical water reforming.

TL;DR: In this paper, the influence of injection timing on the engine performance and exhaust emissions of a naturally aspirated, single cylinder diesel engine has been experimentally investigated when using ethanol blended diesel fuel from 0% to 15% with an increment of 5%.

TL;DR: In this article, a three-step fixed bed reaction was used to synthesize a mixture of WCO, water, methanol, and solvent (hexane), and the main product was a fatty acid methyl ester (FAME), of which methyl oleate was the main component.

TL;DR: In this paper, an artificial neural network (ANN) model for estimating and modelling of daily global solar radiation has been developed by using different combination as inputs: the air temperature, relative humidity, sunshine duration and the day of year.

TL;DR: In this paper, a cascaded nonlinear controller is designed for a variable speed wind turbine equipped with a Doubly Fed Induction Generator (DFIG) to optimize wind energy capture.

TL;DR: In this article, a methodology for calculating fuel consumption and emission factors when regarding emission standards, with distinct driving cycles, based on SAE J1711, aiming a fair comparison among vehicle technologies, and giving insight on electric grid impact and on CO2 life-cycle emissions.

TL;DR: In this article, a performance assessment study for a number of micro-cogeneration systems and residential buildings was performed using the whole-building simulation program TRNSYS, using domestic hot water and electric demand profiles specified in IEA Annex 42.

TL;DR: In this article, an optimization of compressor pressure ratio and intermediate pressure between HP and LP turbines leading to maximum thermal efficiency is implemented for a supercritical CO2 recompression cycle with reheating applicable to next generation nuclear reactors.

TL;DR: An improved harmony search (IHS) algorithm based on exponential distribution for solving economic dispatch problems and the generation costs are lower than those of the classical HS and other optimization algorithms reported in recent literature.

TL;DR: In this paper, a multiobjective chaotic particle swarm optimization (MOCPSO) method has been developed to solve the environmental/economic dipatch (EED) problems considering both economic and environmental issues.