Search results for "Data type"

showing 10 items of 1183 documents

Grid integration of PEM fuel cell with multiphase switching for maximum power operation

2016

Energy storage in the form of electrolytic Hydrogen can play an important role for integration of intermittent renewable energy sources in the smart grid environment. Electrolytic Hydrogen can be used as a fuel in proton exchange membrane (PEM) fuel cell. In this work, a technique for multiphase switching of a DC-DC converter associated with grid integration of a PEM fuel cell stack for maximum power operation in non-dispatchable mode is proposed. The presented system consists of a PEM fuel cell stack which is operating in non-dispatchable mode of operation, DC-DC multiphase switching boost converter for maximum power operation and a grid tied three phase voltage source inverter (VSI). VSI …

EngineeringMaximum power principlebusiness.industry020209 energy020208 electrical & electronic engineeringElectrical engineeringProton exchange membrane fuel cell02 engineering and technologyEnergy storagePower (physics)Renewable energySmart gridStack (abstract data type)Boost converter0202 electrical engineering electronic engineering information engineeringbusiness2016 IEEE International Conference on Power System Technology (POWERCON)
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A GRASP algorithm for the container stowage slot planning problem

2016

This work presents a generalization of the Slot Planning Problem which raises when the liner shipping industry needs to plan the placement of containers within a vessel (stowage planning). State-of-the-art stowage planning relies on a heuristic decomposition where containers are first distributed in clusters along the vessel. For each of those clusters a specific position for each container must be found. Compared to previous studies, we have introduced two new features: the explicit handling of rolled out containers and the inclusion of separations rules for dangerous cargo. We present a novel integer programming formulation and a Greedy Randomized Adaptive Search Procedure (GRASP) to solv…

EngineeringOperations researchHeuristic (computer science)Container vessel stowage planning0211 other engineering and technologiesTransportation02 engineering and technologyManagement Science and Operations ResearchSHIPSOPERATIONSNUMBERGRASP0202 electrical engineering electronic engineering information engineeringHeuristic algorithmsLOADING PROBLEMBusiness and International ManagementInteger programmingREDUCEGreedy randomized adaptive search procedureCivil and Structural EngineeringSlot planningECONOMICS021103 operations researchbusiness.industryGRASPSHIFTSInteger programmingREACTIVE GRASPENGINEERINGPACKING PROBLEMSPacking problemsContainer (abstract data type)StowageBenchmark (computing)020201 artificial intelligence & image processingbusinessSETTransportation Research Part E: Logistics and Transportation Review
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A procedure to calculate the five-parameter model of crystalline silicon photovoltaic modules on the basis of the tabular performance data

2013

Abstract Only few manufactures provide the wide set of graphical data that are necessary to use high performance predictive tools for PV systems. On the other hand, reliable graphical data require accurate laboratory measurements that increase manufacturing costs. For this reason PV system designers have to choose between the use of cheap PV modules, lacking in technical data, and the reliable energy predictions that are possible only if the current–voltage characteristics are provided by the PV module manufacturers. This paper describes the procedure to evaluate the parameters of a one-diode equivalent circuit able to accurately represent the electrical behaviour of a PV panel by means of …

EngineeringSettore ING-IND/11 - Fisica Tecnica AmbientaleBasis (linear algebra)business.industryMechanical EngineeringReliability (computer networking)Photovoltaic systemBuilding and ConstructionVisual Basic for ApplicationsManagement Monitoring Policy and LawReliability engineeringSet (abstract data type)General EnergyPhotovoltaic modules; Five-parameter model; I–V characteristics; Solar energyEquivalent circuitCrystalline siliconbusinessEnergy (signal processing)Applied Energy
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The importance of reliable climatic data in the energy evaluation

2012

Abstract In the last few years, more and more attention has been focused on energy issues, as it is pointed out, for example, by the Directive 2002/91/EC on the Energy Performance of Buildings and Directive 2009/28/EC on the promotion of the use of energy from renewable sources. However, in order to do that, reliable tools for technicians to design systems for such topics should be provided. Nowadays, several software are available; the weak point is the availability of reliable climatic data and, above all, the ones referring to solar radiation. In this work, after a short overview of the world climatic databases, a description of three statistical methods for the elaboration of a climatic…

EngineeringSettore ING-IND/11 - Fisica Tecnica Ambientalebusiness.industryMechanical EngineeringPhotovoltaic systemEnvironmental resource managementEnvironmental impact of the energy industryBuilding and ConstructionEnergy consumptionEnvironmental economicsDirectivePollutionIndustrial and Manufacturing EngineeringRenewable energySet (abstract data type)General EnergySoftwareWork (electrical)Settore ING-IND/10 - Fisica Tecnica IndustrialeElectrical and Electronic EngineeringTest Reference Year Climatic data Energy building consumptions PV energy productionbusinessCivil and Structural EngineeringEnergy
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Coupling CFD with a one-dimensional model to predict the performance of reverse electrodialysis stacks

2017

Abstract Different computer-based simulation models, able to predict the performance of Reverse ElectroDialysis (RED) systems, are currently used to investigate the potentials of alternative designs, to orient experimental activities and to design/optimize prototypes. The simulation approach described here combines a one-dimensional modelling of a RED stack with a fully three-dimensional finite volume modelling of the electrolyte channels, either planar or equipped with different spacers or profiled membranes. An advanced three-dimensional code was used to provide correlations for the friction coefficient (based on 3-D solutions of the continuity and Navier-Stokes equations) and the Sherwoo…

EngineeringSettore ING-IND/26 - Teoria Dello Sviluppo Dei Processi ChimiciSettore ING-IND/25 - Impianti ChimiciReverse electrodialysis; Saline Gradient Energy; Ion Exchange Membrane; Computational Fluid Dynamics; Mass transferFiltration and Separation02 engineering and technologyComputational Fluid DynamicComputational fluid dynamicsBiochemistry020401 chemical engineeringStack (abstract data type)Reversed electrodialysisReverse electrodialysiPerformance predictionMass transferGeneral Materials Science0204 chemical engineeringPhysical and Theoretical ChemistrySettore ING-IND/19 - Impianti NucleariSimulationIon Exchange MembraneLaplace's equationSettore ING-IND/24 - Principi Di Ingegneria ChimicaSaline Gradient EnergyFinite volume methodbusiness.industryScalar (physics)Mechanics021001 nanoscience & nanotechnologySettore ING-IND/06 - Fluidodinamica0210 nano-technologyConvection–diffusion equationbusinessJournal of Membrane Science
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Design, sizing and set up of a specific low cost electronic load for PV modules characterization

2013

In this paper, the design, sizing and set-up of a specific low cost electronic load, based on a DC-DC step-down converter, suitable for the PV module I - V characteristic curves determination, is described. In particular, for its set up, a low cost and user friendly micro-controller has been employed in order to generate the PWM signal. The measures carried out connecting the electronic load prototype to a commercial PV module are here presented and discussed. The conceived electronic load has allowed the determination of 80% of the PV module characteristic curves in 2 s. This low measurement time, lower than the time intervals in which weather conditions may change, allows to assume as con…

EngineeringSignal generatorbusiness.industryRippleSettore ING-IND/32 - Convertitori Macchine E Azionamenti ElettriciSignalSizingElectronic Load PV modules I-V characteristic curvesSet (abstract data type)MicrocontrollerElectronic engineeringMATLABbusinesscomputerPulse-width modulationcomputer.programming_language2013 Eighth International Conference and Exhibition on Ecological Vehicles and Renewable Energies (EVER)
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Using and Extending the SPEM Specifications to Represent Agent Oriented Methodologies

2009

Situational Method Engineering used for constructing ad-hoc agent oriented design processes is grounded on a well defined set of phases that are principally based on reuse of components coming from existing agent design processes; these components have to be stored in a repository. The identification and extraction of these components could take large advantages from the existence of a standardized representation of the design processes they come from. In this paper we illustrate our solution based on SPEM 2.0 specifications for modelling agent design processes and extending them when necessary to meet the specific needs we faced in our experiments.

EngineeringSituational Method Engineeringbusiness.industryMethod engineeringReuseAgent designAgent oriented designSet (abstract data type)Agent-oriented methodologyIdentification (information)Agent oriented designSystems engineeringDesign procebusinessRepresentation (mathematics)
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Development of a high-accuracy PC-based wattmeter with commercial data acquisition boards

2011

This paper presents the development of a high accuracy sampling wattmeter, which makes use of two commercial data acquisition boards (DAQs) connected to a common personal computer. Commercial software is also used for data processing and implementation of the virtual instrument. The set up of the PC-based wattmeter is described and a preliminary evaluation of its metrological performances is made by means of two series of experimental tests, which were carried out with an electric power standard and a high performance multifunction calibrator. © 2011 IEEE.

EngineeringVirtual instrumentElectric power measurementPC-basedlaw.inventionSet (abstract data type)Data acquisitionSampling (signal processing)lawExperimental testElectronic engineeringMeasurement theorySampled data control systemsCommercial softwareData processingpower measurements data acquisition wattmeters power system measurements sampled data systems PC-based instrumentsVirtual instrumentationData acquisition boardbusiness.industryMetrological performanceWattmeterData handlingCommercial softwareElectric powerPersonal computersSampled data systemsPower qualityPower system measurementPersonal computerHigh-accuracyInstrumentsbusinessWattmetersSettore ING-INF/07 - Misure Elettriche E Elettroniche2011 IEEE International Instrumentation and Measurement Technology Conference
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A RELIABILITY MODEL FOR OPTIMAL ALLOCATION OF SPARE TOOLS IN FMS

1989

ABSTRACT A model for the dynamic management of the tool set of an FMS workstation is developed. The proposed approach processing the on-line recorded tool failure data updates the estimate of the parameters of the probability density functions of tool life and selects, at the occurence of each failure, the code of the tool to be allocated in the workstation storage devices in order to maximize its reliability over a planned horizon.

EngineeringWorkstationbusiness.industryProbability density functionlaw.inventionReliability engineeringSet (abstract data type)lawSpare partCode (cryptography)Optimal allocationbusinessReliability modelReliability (statistics)
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Experimental test on a fuel cell powered brushless synchronous motor for automotive applications

2014

In this paper, a fuel cell powered motor emulator is proposed. The MATLAB/Simulink model including the fuel cell stack, the motor and drive models is described. The Urban Driving Cycle test is performed in MATLAB environment. Effective operating conditions of the whole fuel cell powered motor are accurately emulated according to actual regulations in force. The emulated current profile is used for experimental tests on a 5kW Nuvera PowerFlow stack. Thanks to the proposed approach, the motor and inverter drives are accurately emulated and the provided test-bench is used to evaluate performances of the stack under test for automotive applications. Simulation and experimental results are compa…

Engineeringbusiness.industryAutomotive industryautomotive fuel cell synchronous motor electric vehicles.Settore ING-IND/32 - Convertitori Macchine E Azionamenti ElettriciAutomotive engineeringStack (abstract data type)InverterFuel cellsbusinessMATLABSynchronous motorcomputerDriving cyclecomputer.programming_language3rd Renewable Power Generation Conference (RPG 2014)
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