Search results for " rene."

showing 10 items of 258 documents

Energy and environmental assessment of residual bio-wastes management strategies

2021

Abstract This paper assesses the potential energy and environmental impacts of an anaerobic digester coupled with a combined heat and power plant powered with bio-wastes from the agri-food sector. The analysis is carried out through the Life Cycle Assessment methodology following a “cradle-to-grave” approach and is based mostly on primary data. The anaerobic digester - combined heat and power plant is analysed considering a twofold perspective: one more energy – oriented where the main function of the system is to generate renewable electricity and a waste – oriented one in which the main function is treating bio-wastes. In addition, the environmental indirect effects related to potential c…

Waste managementPower stationRenewable Energy Sustainability and the Environmentbusiness.industry020209 energyStrategy and Management05 social sciences02 engineering and technologyIndustrial and Manufacturing EngineeringNational GridRenewable energyElectricity generationBioenergy050501 criminology0202 electrical engineering electronic engineering information engineeringEnvironmental scienceEnvironmental impact assessmentElectricitybusinessLife-cycle assessmentBio-wastes management Bioeconomy Bioenergy Circular economy Life cycle assessment Renewable energy0505 lawGeneral Environmental ScienceJournal of Cleaner Production
researchProduct

Manure as a potential source of renewable energy: The behaviour and characterisation of biofuels generated from three animal manure types when subjec…

2020

Regions with high livestock density lack sufficient land on which to apply manure without exceeding the legal limits set by the European Union Directives. The lack of manure processing alternatives aggravates the situation, especially in the case of islands. Consequently, manure becomes a liability rather than an asset. Results indicate that pyrolysis is an option for manure processing. However, a significant limitation is the moisture content of the starting material, that could compromise the process efficiency. Yields of biogas, bio-oil and biochar, all of which have a potential use as biofuels, are particular to animal type and manure handling system. The conversion of manure to biofuel…

Waste managementRenewable Energy Sustainability and the Environmentbusiness.industryStrategy and ManagementSettore AGR/09 - Meccanica AgrariaManagement Monitoring Policy and LawDevelopmentManureRenewable energyBiogasBiofuelBiocharEnvironmental sciencemedia_common.cataloged_instanceLivestockmanure Renewable Energy Sources (RES) islands pyrolysis biofuels bioeconomyEuropean unionbusinessPyrolysismedia_common
researchProduct

Numerical and experimental investigation of a cross-flow water turbine

2016

ABSTRACTA numerical and experimental study was carried out for validation of a previously proposed design criterion for a cross-flow turbine and a new semi-empirical formula linking inlet velocity to inlet pressure. An experimental test stand was designed to conduct a series of experiments and to measure the efficiency of the turbine designed based on the proposed criterion. The experimental efficiency was compared to that from numerical simulations performed using a RANS model with a shear stress transport (SST) turbulence closure. The proposed semi-empirical velocity formula was also validated against the numerical solutions for cross-flow turbines with different geometries and boundary c…

Water turbine020209 energyFlow (psychology)experimental facility02 engineering and technology010501 environmental sciences01 natural sciencesTurbinehydraulic modelSettore ICAR/01 - IdraulicaPhysics::Fluid Dynamics0202 electrical engineering electronic engineering information engineeringShear stressBoundary value problem0105 earth and related environmental sciencesWater Science and TechnologyCivil and Structural EngineeringTurbulenceMechanicshydraulics of renewable energy systemhydraulic machinery designCross-flow turbine; experimental facility; hydraulic machinery design; hydraulic model; hydraulics of renewable energy systems; RANS modelCross-flow turbineRANS modelEnvironmental scienceCross-flow turbineReynolds-averaged Navier–Stokes equations
researchProduct

Technological and legislative status point of stationary energy storages in the EU

2019

Abstract European renewable generation has been supported through several policy instruments in the last decades, and this has caused a significant growth of the renewable energy sector, spurred by the ambitious climate and energy policy targets. Despite this impetuous growth, the electricity infrastructure is not yet ready to accept increasing shares of variable renewable energy sources (RES) generation, and this is causing grid balance challenges, due to the inherently variable nature of the PV and wind energy. In order to overcome this issue, allowing higher shares of renewable generation in the energy sector, energy storage (ES) systems are becoming increasingly competitive in the globa…

Wind powerRenewable Energy Sustainability and the Environmentbusiness.industry020209 energyEnergy storage system02 engineering and technologyEnvironmental economicsEnergy storageEnergy policyRenewable energyDatabaseSettore ING-IND/33 - Sistemi Elettrici Per L'EnergiaVariable renewable energyStationary applicationWork (electrical)Order (exchange)Regulatory framework0202 electrical engineering electronic engineering information engineeringStorage technologieBusinessEnergy supply
researchProduct

Optimizing the generation system in a microgrid with power, thermal energy and mobility demands

2021

Microgrids are widely known to be the future of generation and distribution systems. This paper presents a method to optimize the size of the main components in a microgrid to supply the demands for electricity, heating and hydrogen for mobility through an Energy Hub model. The electricity production from a wind turbine, a CHP and a fuel cell satisfies the local electricity demand. The green hydrogen produced in the hub from renewable power in off-peak hours is used to feed the fuel cell or to meet the mobility demand. The heating power from CHP and fuel cell is used to feed the local district heating network.

Wind powerbusiness.industryTurbineAutomotive engineeringRenewable energySettore ING-IND/33 - Sistemi Elettrici Per L'EnergiaCogenerationElectricity generationEnvironmental scienceElectricityMicrogridbusinessThermal energyElectrolyzer energy hub green hydrogen optimization renewables
researchProduct

Wind turbines to power telecommunication Systems: A case study in Sicily

2011

Wind turbine TLC renewable energy
researchProduct

La cultura ci salverà? Processi di touristification a base culturale nel centro storico di Palermo

2023

Negli ultimi tre decenni la cultura ha avuto un ruolo chiave nella costruzione delle politiche urbane, divenendo uno strumento decisivo nella definizione delle strategie di sviluppo economico e nell’accesso alla competizione globale che caratterizzano l’attuale regime di neoliberismo urbano (Miles e Paddison 2005). Anche nel sud Europa la cosiddetta rigenerazione a base culturale ha rappresentato e continua ancora oggi a rappresentare una vera e propria ortodossia urbana, che trova nel turismo tanto una ragione di esistenza quanto un campo di attuazione. In particolare, negli ultimi anni i centri storici di molte città sudeuropee sono stati oggetto di trasformazioni profonde in cui pratiche…

Within this framework Palermo and its historic center are no exception. The epicenter of these processes is represented here by the Kalsa district which since the early 2000s has been placed at the center of a precise strategy of culturally-based renewal called to drive the city's tourist renaissance (Vinci 2008). The culmination of this path came in 2018 when Palermo was named the Italian capital of culture and chosen as the venue for Manifesta one of the most prestigious traveling biennales of contemporary art. However the exponential increase in tourist arrivals in the last three years came to a halt with the outbreak of the pandemic which showed with unprecedented evidence the contradictions of the development strategies pursued in the historic center and the marks they leave on the territories. While this sudden interruption seems to offer an opportunity to radically rethink urban and cultural policies and find new curbs to the conditions of overtourism in which the historic centers of South European cities and beyond find themselves it could also prove to be an accelerator of the dynamics of commodification of these spaces representing the revival of tourism an easy escape route in times of crisis. The objective of this contribution is to critically explore the urban and social transformations that have crossed the Kalsa district of Palermo from the 2000s to the present using qualitative and quantitative techniques (analysis of statistical data in-depth interviews critical discourse analysis ...) with particular reference to the role that culture has played in these processes. While it is impossible to prefigure post-pandemic scenarios we will examine documents and discourses that trace possible development directions for South European cities and their historic centers.Settore ICAR/21 - UrbanisticaSettore M-GGR/01 - Geografia
researchProduct

Statistics of transitions for Markov chains with periodic forcing

2013

The influence of a time-periodic forcing on stochastic processes can essentially be emphasized in the large time behaviour of their paths. The statistics of transition in a simple Markov chain model permits to quantify this influence. In particular the first Floquet multiplier of the associated generating function can be explicitly computed and related to the equilibrium probability measure of an associated process in higher dimension. An application to the stochastic resonance is presented.

[MATH.MATH-PR] Mathematics [math]/Probability [math.PR]Markov chain mixing timeMarkov kernelMarkov chainProbability (math.PR)Markov chainlarge time asymptoticStochastic matrixcentral limit theoremMarkov process[MATH.MATH-PR]Mathematics [math]/Probability [math.PR]symbols.namesakeMarkov renewal processModeling and SimulationFloquet multipliersStatisticsFOS: MathematicssymbolsMarkov propertyExamples of Markov chainsstochastic resonance60J27 60F05 34C25[ MATH.MATH-PR ] Mathematics [math]/Probability [math.PR]Mathematics - ProbabilityMathematics
researchProduct

LCA applied to an anaerobic digestion plant for biomethane and digestate production

2019

Nowadays it is paramount to promote bioenergy for climate protection, energy security and creation of income/jobs. In this perspective, Anaerobic Digestion (AD) for biogas and digestate production seems to be a viable way to simultaneously improve waste management while producing Renewable Energy Sources (RES). The main objective of this work is to assess the environmental impact associated with biomethane and digestate production from an AD plant as Global Warming Potential, expressed in CO2 equivalents. Therefore, a LCA was carried out for the production of biomethane ready for the injection into the Italian distribution natural gas grid. A mix from different waste sources (cattle manure …

bioenergy biogas environmental impact natural gas Renewable Energy Sources (RES)Settore AGR/09 - Meccanica Agraria
researchProduct

Development of a High Granularity Photovoltaic Model That Considers Complex Nonuniform Shadow Conditions and Different Cell Temperatures

2012

In this paper is the development of a high granularity photovoltaic model that considers complex nonuniform shadow conditions and different cell temperatures. The model integrates the nonuniform shading characteristics such as different areas for each cell, different direct and indirect solar irradiations for each cell, and different temperatures. The area of the shadow on the PV module is found using image processing. The bond graph formalism facilitates the representation of the energy exchange between the different parts of the PV module. This complexity justifies the effort to develop a high-granularity tool. The proposed model is validated through experimental tests under shading condi…

business.industryComputer sciencePhotovoltaic systemImage processingMaximum power point trackingRenewable energyComputational scienceSettore ING-INF/04 - AutomaticaShadowGranularitybusinessRepresentation (mathematics)Bond graphHigh granularity photovoltaic model solar cells renewable energies
researchProduct