Showing papers in "Renewable Energy in 2005"

TL;DR: In this paper, a two-step esterification method was developed to produce biodiesel from high FFA vegetable oils, which consists of acid-catalyzed pretreatment followed by an alkaline-caralyzed transesterification.

TL;DR: In this article, a genetic algorithm approach is employed to obtain optimal placement of wind turbines for maximum production capacity while limiting the number of turbines installed and the acreage of land occupied by each wind farm.

TL;DR: In this article, a pre-feasibility study of using hybrid energy systems with hydrogen as an energy carrier for applications in Newfoundland, Canada is explained, and various renewable and non-renewable energy sources, energy storage methods and their applicability in terms of cost and performance are discussed.

TL;DR: In this article, the authors studied the activity of olivine and dolomite for tar degradation in a gasification of biomass, and showed that the conversion of all tar classes increases as the temperature was raised from 800 to 900°C for both additives.

TL;DR: In this article, the effects of different ethanol-diesel blended fuels on the performance and emissions of diesel engines have been evaluated experimentally and compared in a water-cooled single-cylinder Direct Injection (DI) diesel engine.

TL;DR: In this paper, the authors compared direct input energy and indirect energy in per hectare in cotton production and compare with input costs, and concluded that large farms were more successful in energy productivity, use efficiency and economic performance.

TL;DR: In this article, Mahua Oil Ethyl Ester (MOEE) was used as a substitute for diesel in a 4-stroke direct injection natural-aspirated diesel engine.

TL;DR: In this paper, a mathematical model is developed to simulate the transient phenomena in a polymer electrolyte membrane fuel cell (PEMFC) system, which can predict the transient response of cell voltage, temperature of the cell, hydrogen/oxygen out flow rates and cathode and anode channel temperatures/pressures under sudden change in load current.

TL;DR: A review of the efforts made to improve the quality of biogas by scrubbing CO 2 and the results obtained can be found in this article, where a unified approach for scrubbing, compressing and subsequent storage of Biogas for wider applications is presented.

TL;DR: In this paper, various blends of rubber seed oil and diesel were prepared and its important properties such as viscosity, calorific value, flash point, fire point, etc. were evaluated and compared with that of diesel.

TL;DR: In this paper, waste frying oil was used as an alternative fuel for diesel engine and the performance and exhaust emissions of a single-cylinder diesel engine was evaluated using diesel, non-edible vegetable oil (without preheating) and waste-frying oil preheated to two different inlet temperatures (75 and 135 °C).

TL;DR: In this paper, the effects of ethanol addition to gasoline on an SI engine performance and exhaust emissions are investigated experimentally and theoretically, and the proposed SI engine cycle model has an ability of computing SI engine cycles when using ethanol and ethanol-gasoline blends and it can be used for further extensive parametric studies.

TL;DR: In this article, a solar cooling system that has been designed for Malaysia and similar tropical regions using evacuated tube solar collectors and LiBr absorption unit is carried out with TRNSYS program, the typical meteorological year file containing the weather parameters for Malaysia is used to simulate the system.

TL;DR: In this article, the authors investigated the effect of the PV window on energy consumption of office buildings in terms of heating and cooling loads, daylighting, and electricity production, and the results showed that the solar cell transmittance of 40% and window to wall ratio (WWR) of 50% achieved the minimum electricity consumption in the building when artificial lighting was controlled with daylighting.

TL;DR: A method of maximum power point tracking using adaptive fuzzy logic control for grid-connected photovoltaic systems and can deliver more power than the conventional fuzzy logic controller.

TL;DR: In this paper, the authors provide a broad overview of energy efficiency issues in the built environment in China and discuss the key national policies related to built environment and demonstrate the government's environmental concern.

TL;DR: An experimental investigation has been carried out to study the heat transfer coefficient by using 90° broken transverse ribs on absorber plate of a solar air heater; the roughened wall was being heated while the remaining three walls are insulated as discussed by the authors.

TL;DR: In this article, the authors describe dynamic modeling and simulation results of a small wind-fuel-cell hybrid energy system, which consists of a 400 W wind turbine, a proton exchange membrane fuel cell (PEMFC), ultracapacitors, an electrolyzer, and a power converter.

TL;DR: In this paper, a PC-based maximum power point tracker (MPPT) for PV system using neural networks (NN) was developed and implemented, where the control action gives the driving signals to the MPPT.

TL;DR: In this paper, a life cycle assessment of a solar thermal collector for sanitary warm water demand has been performed following the international standards of series ISO 14040, where the following phases have been investigated: production and deliver of energy and raw materials, production process, installation, maintenance, disposal and transports occurring during each step.

TL;DR: In this paper, a double-pass photovoltaic-thermal solar air collector with compound parabolic concentrator (CPC) and fin attached to the back side of the absorber plate was designed and evaluated.

TL;DR: In this paper, the performance and entropy of a double-pass flat plate solar air heater with longitudinal fins was studied numerically, at air mass flow rate ranging between 0.02 and 0.1 kg/s.

TL;DR: In this article, an energy analysis of a single-effect lithium bromide/water absorption system for cooling and heating applications is presented, and a simulation program is written and used for the determination of the coefficient of performance (COP) and exergetic efficiency of the absorption system under different operating conditions.

TL;DR: In this article, the design of a horizontal axis Marine Current Turbine using 2D aerofoil data and a blade element momentum software package is described, and the results of the simulations are combined with an analytical method that details the layout and energy capture potential throughout a large-scale array.

TL;DR: In this article, the performance of single and double slope multi-wick solar distillation systems in quasi-steady state conditions has been analyzed based on the basic energy balance for both the systems.

TL;DR: In this paper, the authors put forward to solar energy potential in Turkey using artificial neural networks (ANNs) for evaluating solar resource posibilities in regions where a network of monitoring stations have not been established in Turkey.

TL;DR: The Animals (data)Base for Energy Potential Estimation (ABEPE) as mentioned in this paper is a GIS based biomass resource assessment application using a relational database management system to estimate biogas production from livestock manures.

TL;DR: In this article, the authors briefly outline the reasons that restrict wind penetration in diesel-based electricity systems and review estimates and examples of autonomous and interconnected power systems, and discuss the impact of wind turbines on power quality and reliability.

TL;DR: In this paper, the effect of fuel inlet temperature on performance, emission and combustion characteristics of a diesel engine is evaluated using preheated animal fat as fuel, which shows reduced ignition delay and combustion duration.

TL;DR: A methodology for developing a simple theoretical model for calculating global insolation on a horizontal surface is described in this article, where the input parameters to the model are the latitude of the desired location and the amount of total precipitable water content in the vertical column at that location.