Showing papers in "Renewable Energy in 2009"

TL;DR: Regulation mechanism of oil accumulation in microorganism and approach of making microbial diesel economically competitive with petrodiesel are discussed in this review.

TL;DR: In this article, the authors examined the use of fractional-ARIMA or f-ARAMA models to model, and forecast wind speeds on the day-ahead and two-day-ahead (48 h) horizons.

TL;DR: In this paper, the importance of solar cell/module operating temperature for the electrical performance of silicon-based photovoltaic installations is briefly discussed, and the explicit and implicit correlations found in the literature which link this temperature with standard weather variables and material/systemdependent properties, in an effort to facilitate the modeling/design process in this very promising area of renewable energy applications.

TL;DR: In this article, the social, economical and environmental effects of renewable energy system have been discussed in the remote areas of the world, and the results show that the trends of total emission reduction in different years, which is exponentially increasing after the installation of renewable energies system in remote areas.

TL;DR: In the present study, cellulolytic enzymes for biomass hydrolysis were produced using solid state fermentation on wheat bran as substrate using fungi Trichoderma reesei RUT C30 and Aspergillus niger MTCC 7956 as substrate.

TL;DR: In this paper, an artificial neural network (ANN) model was used to predict the brake power, torque, specific fuel consumption and exhaust emissions of a two-cylinder four-stroke diesel engine.

TL;DR: In this paper, the interplay between the crucial parameters of the lipase-catalyzed reactions carried out in nonaqueous systems and the yield of biodiesel synthesis is investigated.

TL;DR: In this article, the performance, emissions and combustion characteristics of the compression ignition engine of a diesel and biodiesel engine were analyzed, and the results showed that biodiesel exhibited similar combustion stages to that of diesel, however, biodiesel showed an earlier start of combustion.

TL;DR: In this paper, the potential for offshore wind energy, the current status of this technology, and existing plans for the development of offshore wind parks are described, for both Europe and North America.

TL;DR: In this paper, the authors discuss the costs and benefits of offshore wind relative to onshore wind power and conventional electricity production, and develop empirical cost functions for offshore wind based on publicly reported projects from 2000 to 2008.

TL;DR: In this article, the transesterification of palm oil to methyl esters (biodiesel) was studied using KOH loaded on Al 2 O 3 and NaY zeolite supports as heterogeneous catalysts.

TL;DR: In this paper, the integration of photovoltaic (PV), fuel cell (FC) and ultra-capacitor (UC) systems for sustained power generation is discussed.

TL;DR: In this paper, both edible (coconut oil, palm oil, groundnut oil, and rice bran oil) and non-edible oils (pongamia, neem and cotton seed oil) were used to optimize the biodiesel production process variables like catalyst concentration, amount of methanol required for reaction, reaction time and reaction temperature.

TL;DR: In this paper, three stand-alone photovoltaic power systems using different energy storage technologies are studied, including PV modules, fuel cells, electrolyzers, compressors, hydrogen tanks and batteries.

TL;DR: The authors summarizes policy and regulatory drivers for biofuels in the U.S., describes usage trends and projections, and highlights major R&D efforts to promote development and commercialization of 2nd Generation Biofuels.

TL;DR: In this paper, an advanced particle swarm optimization algorithm is used to solve the optimization problem of a hybrid wind/photovoltaic/fuel cell generation system, which is designed to supply power demand.

TL;DR: In this paper, an exergetic optimization of flat plate solar collectors is developed to determine the optimal performance and design parameters of these solar to thermal energy conversion systems, where the following geometric and operating parameters are considered as variables: the absorber plate area, dimensions of solar collector, pipes' diameter, mass flow rate, fluid inlet, outlet temperature, etc.

TL;DR: In this paper, the cold flow properties of biodiesel were evaluated with and without pour point depressants towards the objectives of identifying the pumping and injecting of these biodiesel in CI engines under cold climates.

TL;DR: In this article, the effects of unleaded gasoline (E0) and ethanol-ethanol blends (E50 and E85) on engine performance and pollutant emissions were investigated experimentally in a single cylinder four-stroke spark-ignition engine at two compression ratios (10:1 and 11:1).

TL;DR: In this paper, the suitability of isobutanol-diesel fuel blends as an alternative fuel for the diesel engine, and experimentally determine their effects on the engine performance and exhaust emissions, namely break power, break specific fuel consumption (BSFC), break thermal efficiency (BTE), and emissions of CO, HC and NO x.

TL;DR: In this article, the authors presented a methodology for the assessment of photovoltaic potential in urban areas using open-source solar radiation tools and a 3D city model implemented in a geographic information system (GIS).

TL;DR: In this article, the authors apply the ISO 14040 standard to the whole life cycle of a wind turbine, from cradle to grave, with regard to the manufacture of its key components, transport to the wind farm, subsequent installation, start-up, maintenance and final dismantling and stripping down into waste materials and their treatment.

TL;DR: In this paper, a device for inserting an absorbing plate made of aluminium cans into the double-pass channel in a flat-plate solar air heater (SAH), which substantially improves the collector efficiency by increasing the fluid velocity and enhancing the heat transfer coefficient between the absorber plate and air.

TL;DR: The developed model for short term wind speed forecasting showed a very good accuracy to be used by the Electric Utility Control Centre in Oaxaca for the energy supply.

TL;DR: In this paper, the phase change phenomena of PCM inside the capsules are analyzed by using enthalpy method, and the results obtained are used for the thermal performance analysis of both charging and discharging processes.

TL;DR: In this article, an intelligent control method for the maximum power point tracking (MPPT) of a photovoltaic system under variable temperature and irradiance conditions is presented. And a fuzzy logic controller based MPPT (FLC) is then proposed which has shown better performances compared to the P&O MPPT based approach.

TL;DR: In this paper, the impacts of energy policies on industry growth in renewable energy were investigated and the results indicated that there are increased industrial opportunities in renewable energies to be captured not only by large countries or through large public resources, but also smaller countries can gain success through clever policies and optimal managing of the commercialization process.

TL;DR: In this article, the authors investigated the possibility of improving the performance of a photovoltaic water pumping system by spraying water over the photiovoltaic cells, which can significantly increase the system and subsystem efficiency and pump flow rate when operating under different heads.

TL;DR: In this paper, the effect of injection timing on the exhaust emissions of a single cylinder, naturally aspirated, four-stroke, direct injection diesel engine has been experimentally investigated by using methanol-blended diesel fuel from 0% to 15% with an increment of 5%.

TL;DR: In this article, a methodology of sensitivity analysis is presented and an application example is given for design of an office building in Denmark, where the sensitivity analyses will typically be performed at a reasonably early stage of the building design process, where it is still possible to influence the most important design parameters.