Showing papers in "Renewable Energy in 2014"

TL;DR: In this paper, a new analytical wake model is proposed and validated to predict the wind velocity distribution downwind of a wind turbine by applying conservation of mass and momentum and assuming a Gaussian distribution for the velocity deficit in wake.

TL;DR: In this paper, the authors focused on the hydrogen production from biomass via steam gasification and the influence of process parameters on hydrogen yield, including biomass type, biomass feed particle size, reaction temperature, steam to biomass ratio, addition of catalyst, sorbent to biomass ratios.

TL;DR: In this article, the best hybrid technology combination for electricity generation from a mix of renewable energy resources to satisfy the electrical needs in a reliable manner of an off-grid remote village, Palari in the state of Chhattisgarh, India is proposed.

TL;DR: In this paper, an assessment model based on analytic hierarchy process (AHP) is developed for prioritizing renewable options, which employs four main criteria, technical, economical, social and environmental aspects, and twelve sub-criteria.

TL;DR: A hybrid model combining with input selected by deep quantitative analysis, Wavelet Transform, Genetic Algorithm,GA and Support Vector Machines (SVM) was proposed, which outperforms the comparison models in predicting wind speed.

TL;DR: In this paper, the authors reveal the rate of ageing of a national fleet of wind turbines using free public data for the actual and theoretical ideal load factors from the UK's 282 wind farms.

TL;DR: In this article, the authors investigate several possible methods for redirecting turbine wakes, including some existing and some novel approaches, and compare their ability to redirect turbine wakes and their effects on turbine power capture and structural loads using the high-fidelity wind plant simulation tool Simulator for On/Offshore Wind Farm Applications.

TL;DR: In this paper, the authors presented a comprehensive analysis and comparison of the levelised cost of energy (LCOE) for the following offshore floating wind turbine concepts: Spar-Buoy (Hywind II), Tension-Leg-Spar (SWAY), Semi-Submersible (WindFloat), TLWT, and tension-leg-buoy (TLB).

TL;DR: In this article, a hybrid wind/PV system with battery storage and diesel generator is used for this purpose, and a power management algorithm is applied to the load, and the Multi-Objective Particle Swarm Optimization (MOPSO) method is used to find the best configuration of the system and for sizing the components.

TL;DR: In this article, a particle swarm optimization (PSO)-simulation based approach has been used to tackle the multi-objective optimization problem of hybrid renewable energy systems (HRES) including various generators and storage devices.

TL;DR: In this paper, the most traditional and mature storage technology, pumped hydro storage (PHS), is introduced to support the standalone microgrid hybrid solar-wind system, and a mathematical model of the hybrid system is developed and the operating principle is introduced.

TL;DR: In this paper, the authors show that while the wake of the turbine is deeply influenced by the ambient turbulence conditions, its mean performances turn out to be slightly modified, which is crucial in the view of implanting second generation turbines arrays.

TL;DR: An overview of the systematic evolution of different biofuel generations with their advantages and disadvantages has been presented in this paper, where the advancements in technology, reduction in greenhouse gas emission and assessment of commercial production cost of each generation of biofuel have also been highlighted.

TL;DR: In this paper, the specific drivers and barriers for rural electrification in Mozambique and Tanzania are explored across a spectrum of involved actors by qualitative methodology, and data was collected both in semi-structured interviews carried out with power sector actors from national to local level and in visits to off-grid electricity users in Tanzania and Mozambica during eight weeks in 2010.

TL;DR: A generalized model, the ARMAX model, to allow for exogenous inputs for forecasting power output is suggested, which greatly improves the forecast accuracy of power output over the conventional ARIMA model.

TL;DR: In this paper, the authors discuss the relevance of financial citizen participation within the German renewable energy sector, briefly review the technical, political and legal framework that led to the significant development in the field of financial participant participation and analyzes different business models and citizen participation schemes from Germany with a particular focus on so called energy cooperatives and closed-end funds.

TL;DR: In this article, the effect of varying feed water concentrations on a reverse electrodialysis (RED) system in terms of permselectivity of the membrane, energy efficiency, power density and electrical resistance was examined.

TL;DR: In this paper, the authors explored the residual load and excess power generation of 30 European countries with a 100% penetration of variable renewable energy sources to quantify the benefit of power transmission between countries.

TL;DR: In this article, the authors investigated the temperature variation effect on the operation of commercial PV applications based on in-situ measurements at varying weather conditions, taking into account the extended theoretical background in the field so far.

TL;DR: In this paper, the authors employed data at high spatial and temporal resolution data for both solar radiation and wind speed in Italy obtained from running two state-of-the-art models (PVGIS and MINNI).

TL;DR: In this article, the development of the near wake of a vertical axis wind turbine is investigated by stereoscopic particle image velocimetry in an open-jet wind tunnel on an H-shaped rotor, operated at a tip speed ratio of 4.5 and an average chord-based Reynolds number of 1.7 × 10 5.

TL;DR: In this article, the effects of the injection pressure and injection timing on the combustion and emission characteristics in a single-cylinder common-rail direct injection (CRDI) diesel engine fueled with waste cooking oil (WCO) biodiesel and commercial diesel fuel were investigated.

TL;DR: In this article, the authors describe a method to select which turbine architecture is most appropriate for a low-head pico hydro specification using quantitative and qualitative analyses of 13 turbine system architectures found in the literature.

TL;DR: In this paper, a dual-axis solar tracker was developed for flat photovoltaic (PV) and concentrating solar power (CSP) systems, which employs a declination-clock mounting system that locates the primary axis in east-west direction.

TL;DR: In this paper, the experimental technique for measuring the thermal conductivity of nanofluids at the temperatures above 100°C has been developed, and a systematic research on the thermodynamic properties including thermal conductivities, viscosity, specific heat and density, of the graphene-dispersed nano-fluids based on the ionic liquid 1-hexyl-3-methylimidazolium tetrafluoroborate ([HMIM]BF 4 ), has been conducted at the temperature ranging from room temperature to around 200°C.

TL;DR: In this article, the authors investigate the short run and long run causality relationship among energy (electricity production from renewable sources), carbon dioxide emissions, natural resource depletion, gross domestic product (GDP) and poverty in selected SAARC countries, namely, Bangladesh, India, Nepal, Pakistan and Sri Lanka, over a period of 1975-2010.

TL;DR: A short review of recent advances in electrode material and a configuration of both the anode and cathode in microbial electrolysis cells are provided in this article, which mainly reviews the various substrates that have been used in MECs so far, also their resulting performance, as well as future potential substrates discussed.

TL;DR: In this paper, a two-dimensional finite element shallow water model predicts the flow and the performance of the current array configuration, and the gradient of the power extracted with respect to the turbine positions and their tuning parameters is then computed in a fraction of the time taken for a flow solution by solving the associated adjoint equations.

TL;DR: In this paper, the authors proposed the use of a Geographic Information System (GIS) to identify the best plots suitable for installing photovoltaic solar farms in the Municipality of Torre Pacheco, in the southeast of Spain.

TL;DR: In this article, a concurrent precursor method for large eddy simulations is proposed to enable simulations of developing wind turbine array boundary layers with highly realistic inflow conditions, in which a turbulent Atmospheric Boundary Layer (ABL) without wind turbines is simulated in order to generate the turbulent conditions for a second domain in which the wind turbines are placed.