Search results for "Design optimisation"

showing 6 items of 6 documents

Design, modelling, and analysis of a large floating dock for spar floating wind turbine installation

2020

Installation of floating wind turbines at the offshore site is a challenging task. A significant part of the time efficiency and costs are related to the installation methods which are sensitive to weather conditions. This study investigates a large floating dock concept, which can be used to shield a floating wind turbine during installation of tower, nacelle, and rotor onto a spar foundation. In this paper, the concept is described in detail, and a design optimisation is carried out using simple design constraints. Hydrodynamic analysis and dynamic response analysis of the coupled system of the optimum dock and spar are conducted. Two spars of different sizes are considered, and the motio…

NacelleFloating dock0211 other engineering and technologies020101 civil engineeringOcean EngineeringFloating wind turbine02 engineering and technology0201 civil engineeringlaw.inventionlawDOCKGeneral Materials ScienceSpar021101 geological & geomatics engineeringWind powerDesign optimisationRotor (electric)business.industryMechanical EngineeringResponse analysisSpar floating wind turbineSwellFrequency domainVDP::Teknologi: 500Dynamic responseNumerical modellingMechanics of MaterialsOffshore installationHydrodynamicsTime domainbusinessGeologyMarine engineeringMarine Structures
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Membrane distillation heat transfer enhancement by CFD analysis of internal module geometry

2011

Module geometry optimisation can be a crucial matter in all separation processes using selective or hydrophobic membranes, e.g. reverse osmosis (RO) and membrane distillation (MD). In fact the choice of suitable channel shape and size can dramatically affect the performance of the process. With reference to the membrane distillation process, temperature polarization phenomena and pres¬sure drops along the channels largely affect the process efficiency (i.e. the efficient use of temperature driving force for the passage of vapour through the membrane) as well as pressure distribution, module mechanical resistance and pumping costs. Several works have been presented so far in literature on th…

Work (thermodynamics)Settore ING-IND/26 - Teoria Dello Sviluppo Dei Processi ChimiciMechanical engineeringMembrane distillationOcean EngineeringGeometry02 engineering and technology010501 environmental sciencesComputational fluid dynamicsMembrane distillation01 natural sciencesTemperature polarizationComputational fluid dynamicFluid dynamicsReverse osmosisPolarization (electrochemistry)0105 earth and related environmental sciencesWater Science and TechnologyDesign optimisationSpacer geometryChemistrybusiness.industryHeat transfer enhancement021001 nanoscience & nanotechnologyPollution6. Clean waterMembrane0210 nano-technologybusinessSimulationComputational fluid dynamics; Membrane distillation; Spacer geometry; Design optimisation; Simulation; Temperature polarization
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Membrane Distillation efficiency increase by enhanced heat transfer

2009

Settore ING-IND/26 - Teoria Dello Sviluppo Dei Processi ChimiciComputational Fluid Dynamics Membrane Distillation spacer geometry design optimisationsimulation temperature polarization
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A Numerical Approach to the Keel Design of a Sailing Yacht

2008

This paper describes an approach to the keel design of a sailing yacht. The related software, which is fully automatic, permits to obtain an optimal shape by modifying the surface used to define the keel planform. B-spline curves and surfaces have been used because of their ability in following complex shapes. The algorithm integrates ad hoc implemented original software with Computational Fluid Dynamics (CFD) commercial ones. The optimisation procedure makes use of Genetic Algorithms (GAs) and a gradient – based optimiser for the refinement of the solution. A careful CAD and CFD modelling leads to a stable and efficient generalised method, which has been applied to the design of the centre…

EngineeringEnvironmental EngineeringKeelDesign optimisationbusiness.industryGASailing yacht; CFD; GAs; Design optimisationOcean EngineeringCADComputational fluid dynamicsPlanformSoftwareFully automaticSailing yachtbusinessCFDSettore ING-IND/15 - Disegno E Metodi Dell'Ingegneria IndustrialeSimulationComputingMethodologies_COMPUTERGRAPHICSMarine engineeringSailing yacht CFD GAs Design optimisation
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Design and optimisation of an innovative two-hub-and-spoke network for the Mediterranean short-sea-shipping market

2020

Abstract Short Sea Shipping (SSS) is generally considered as a privileged transport mode in terms of reducing road congestion and related external costs. In the last two decades, SSS has attracted a lot of attention in the European Union, where it is also regarded as a key factor for economic and social cohesion between countries. In this regard, the present study proposes a new network design that aims at improving and increasing freight traffic between the north-western and the south-eastern shores of the Mediterranean Basin. The proposed model, designed for Ro-Ro (Roll-on Roll-off) freight transport, tries to overcome the limits of the existing multi-port-calling services through an inno…

Service (systems architecture)021103 operations researchMotorways of the SeaGeneral Computer ScienceOperations researchComputer scienceMotorways of the SeaNetwork Design OptimisationShort Sea ShippingService Frequency Selection0211 other engineering and technologiesGeneral EngineeringMode (statistics)Cohesion (computer science)02 engineering and technologyRo-Ro MarketSupply and demandNetwork planning and designMediterranean Corridors0202 electrical engineering electronic engineering information engineeringShort sea shippingmedia_common.cataloged_instance020201 artificial intelligence & image processingEuropean unionmedia_common
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On thermoeconomics of energy systems at variable load conditions: integrated optimization of plant design and operation

2007

Abstract Thermoeconomics has been assuming a growing role among the disciplines oriented to the analysis of energy systems, its different methodologies allowing solution of problems in the fields of cost accounting, plant design optimisation and diagnostic of malfunctions. However, the thermoeconomic methodologies as such are particularly appropriate to analyse large industrial systems at steady or quasi-steady operation, but they can be hardly applied to small to medium scale units operating in unsteady conditions to cover a variable energy demand. In this paper, the fundamentals of thermoeconomics for systems operated at variable load are discussed, examining the cost formation process an…

ExergyEngineeringPrimary energyRenewable Energy Sustainability and the Environmentbusiness.industryThermoeconomics has been assuming a growing role among the disciplines oriented to the analysis of energy systems its different methodologies allowing solution of problems in the fields of cost accounting plant design optimisation and diagnostic of malfunctions. However the thermoeconomic methodologies as such are particularly appropriate to analyse large industrial systems at steady or quasisteady operation but they can be hardly applied to small to medium scale units operating in unsteady conditions to cover a variable energy demand. In this paper the fundamentals of thermoeconomics for systems operated at variable load are discussed examining the cost formation process and separately the cost fractions related to capital depreciation (which require additional distinctions with respect to plants in steady operation) and to exergy consumption. The relevant effects of the efficiency penalty due to off design operation on the exergetic cost of internal flows are also examined. An original algorithm is proposed for the integrated optimization of plant design and operation based on an analytical solution by the Lagrange multipliers method and on a multi-objective decision function expressed either in terms of net cash flow or primary energy saving. The method is suitable for application in complex energy systems such as ‘‘facilities of components of a same product’’ connected to external networks for power or heat distribution. For demonstrative purposes the proposed thermoeconomically aided optimization is performed for a grid connected trigeneration system to be installed in a large hotel.Energy Engineering and Power TechnologyCost accountingThermoeconomicsGridEnergy conservationVariable (computer science)symbols.namesakeFuel TechnologyNuclear Energy and EngineeringLagrange multipliersymbolsProcess engineeringbusinessSimulation
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