Showing papers in "Renewable Energy in 2012"

TL;DR: In this article, a review of available technologies for bioethanol production from agricultural wastes is discussed, which can increase concentrations of fermentable sugars after enzymatic saccharification, thereby improving the efficiency of the whole process.

TL;DR: A review of the current methods and advances in wind power forecasting and prediction can be found in this article, where numerical wind power prediction methods from global to local scales, ensemble forecasting, upscaling and downscaling processes are discussed.

TL;DR: A review of the state-of-the-art in the condition monitoring of wind turbines can be found in this article, which describes the different maintenance strategies, condition monitoring techniques and methods, and highlights in a table the various combinations of these that have been reported in the literature.

TL;DR: In this paper, the effect of Al2O3-water nanofluid, as working fluid, on the efficiency of a flat-plate solar collector was investigated experimentally.

TL;DR: In this article, the mean annual power absorption of a selection of eight Wave Energy Converters (WECs) with different working principles is derived based on numerical modeling. But, despite very different working principle and dimensions, power performance of the selected devices vary much less than the average power absorption.

TL;DR: In this article, the optimal design, planning, sizing and operation of a hybrid, renewable energy based microgrid with the goal of minimizing the lifecycle cost, while taking into account environmental emissions is discussed.

TL;DR: Justifying continued development and large-scale deployment of Wave Energy Converters requires quantification of the potential resource, and existing estimates do not provide insight into potential future markets, i.e. the location of the resource.

TL;DR: The developed model shows the best accuracy comparing with basic FNN and unmodified EMD-based FNN through multi-step forecasting the mean monthly and daily wind speed in Zhangye of China.

TL;DR: In this paper, the impact of green roofs on indoor air temperature and cooling and heating demand was analyzed for a single-family house with conventional and green roofs in a temperate French climate.

TL;DR: In this article, the authors evaluate the current status and perspectives for enzymatic biodiesel production and indicate the key operational variables that influence lipase activity and stability, together with the technological solutions for industrial implementation of the enzyme process.

TL;DR: In this paper, a comparison of three types of microwave pretreatment such as microwave acid, microwave-alkali and combined microwave acid were tried using sugarcane bagasse as the lignocellulosic biomass.

TL;DR: In this paper, an application of pattern search optimization technique for extracting the parameters of different solar cell models is presented, where the solar cell parameters estimation is viewed and formulated as a multivariate nonlinear optimization problem.

TL;DR: In this paper, a new methodology, the Unrestricted Wind Farm Layout Optimization (UWFLO), is presented to address critical aspects of optimal wind farm planning, simultaneously determining the optimum farm layout and the appropriate selection of turbines (in terms of their rotor diameters) that maximizes the net power generation.

TL;DR: In this article, the authors present detailed simulations of organic Rankine cycle processes for energy conversion of low-enthalpy geothermal resources, where the working fluids considered in this analysis are zeotropic mixtures, and the efficiency of subcritical cycles is calculated for isobutane/isopentane and R227ea/R245fa depending on mixture composition, heat source temperature and temperature difference of cooling water.

TL;DR: In this paper, the effects of the particle size and the moisture content of biomass feedstock and the air/fuel equivalence ratio used in the gasification process with regard to the quality of the producer gas are investigated.

TL;DR: In this article, a simplified explicit model of the wake effect is presented, which includes the cumulative impact of multiple shadowing, the effects of wind direction and the wind speed time delay.

TL;DR: Considering the spectral complexity of planetary gearbox vibration signals as well as their amplitude modulation and frequency modulation (AMFM) nature, a simple yet effective method was proposed in this paper based on amplitude and frequency demodulations.

TL;DR: In this article, the authors present alternatives currently being considered for the use of unrefined glycerol as a byproduct of biodiesel production, aiming to contribute to the sustainable consolidation of the biofuel market.

TL;DR: In this article, a hindcast study with surface winds from the Final Global Tropospheric Analysis (FNL) provides 10 years of spectral wave data for a thorough examination of the wave resource around the world.

TL;DR: In this article, the feasibility of urban anaerobic digestion is investigated and four techniques for biogas estimation are presented: ultimate analysis, yield from molecular formula analysis, a novel computer simulation technique using Anaerobic Digestion Model #1 (ADM1), and a literature review of experimentally determined Biogas yields.

TL;DR: The results show that the proposed EMD–ANN hybrid method is robust in dealing with jumping samplings in non-stationary wind series and the performance of the proposed model is highly satisfactory.

TL;DR: In this paper, a wind-pv-diesel hybrid power system was designed for a village in Saudi Arabia which is presently powered by a diesel power plant consisting of eight diesel generating sets of 1,120kW each.

TL;DR: In this article, a life cycle assessment is carried out to quantify the environmental impact of two existing wind turbines, a 1.8 MW gearless turbine and a 2.0 MW turbine with gearbox.

TL;DR: In this article, the authors presented a study and design of a complete hybrid system for providing the electrical loads in a family house in Palestine according to their energy requirements, and a computer program was developed to achieve this and to determine the specifications of the whole system components.

TL;DR: In this paper, the metal impurities were removed by applying a chemical etching solution on the surface of the PV cell, and a high yield of pure silicon with purity of 99.999% could be obtained.

TL;DR: Due to good nutrients availability during GP operation, significant increment in biomass growth was observed and nutrients deprived condition during SP operation documented increment in lipid productivity due to acceleration of triacylglycerides formation.

TL;DR: In this paper, a theoretical analysis of the relationship between pump and turbine performance was first performed, and a theoretical method of predicting PAT performance was developed using theoretical analysis and empirical correlation.

TL;DR: In this paper, the authors investigated how large-scale energy storage can assist the integration of fluctuating renewable energy by using the Irish energy system, pumped hydroelectric energy storage (PHES), and wind power as a case study.

TL;DR: In this article, the potential of a secondary biodiesel production from the solid residual fraction of restaurant waste after typical grease extraction (SRF) employing a high fat containing insect, black soldier fly, Hermetia illucens was evaluated.

TL;DR: In this article, the authors investigate the impact of TEC array operation on headland sand bank formation, followed by a case study, the Alderney Race, in the Channel Islands and Cap de la Hague (France).