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pleasurecraft engine group transmission torrent

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Considering that the purging phenomenon occurs in a time frame of thirty-five seconds, the purge valve remains open for five seconds and closed for thirty seconds, the influence of the phenomenon in the variation of the operating parameters of the fuel cell has been analyzed intermittent operation causes instability in the hydrogen and oxygen pressure level which results in the instability of the electrical voltage of the plant or of the production of electrical energy.

Electric connection modeling within a kW PEM fuel cells system for marine applications. Nowadays fuel cells are one of the most promising alternatives in order to reduce emissions of harmful substances and greenhouse gases, typical of internal combustion power generation systems.

Their use is becoming increasingly popular both for stationary and non-stationary applications. The control system of the plant has to manage the fault as quick as possible in order to slow down the degradation of the fuel cells and so avoid further damages. The implementation of experimental tests in particularly interesting because of the structure and the size of the system, kW of installed power, that allows to verify the applicability of the Polymeric Electrlyte Membrane Fuel Cell technology in the naval sector.

Traverso, Dr. Anselmi Palma, Prof. Supercritical CO2 S-CO2 power cycles are an element of interest because they could achieve high performances with low impact on the ambient thanks to compact turbomachinery and low working temperatures exploiting the fluid critical temperature and critical pressure This project is part of the development of a S-CO2 experimental facility at Cranfield University to better understand CO2 behaviour near the critical point and de-risk aspects of its application as a power cycle.

The core of the facility consists in a refrigeration cycle, called transcritical pack, working with CO2 that is used a fluid provider for the other segments of the facility where the components for the power cycle are installed to be tested. This work presents the development of a thermofluid model in Simscape representative of a refrigeration cycle working with CO2 and further characterization of two of the components of the transcritical pack of the Cranfield test rig: the compressor and the gas cooler.

The study of the compressor led to the development of a Simulink custom block representative of the real compressor; while for the gas cooler was developed a mathematical model in a spreadsheet to evaluate its setting for the desired heat flux. Since Simscape software was never used at Cranfield University for this specific purpose, along with the description of the developed model, a diagnosis of the capabilities of the software have been performed and the elements for future development have been addressed.

This is a first step towards the development of a representative model of the Cranfield test rig that will allow to achieve a deep understanding of the numerical modelling of SCO2 cycles and enhance current capabilities to predict transient performance. In the last years, with the introduction of renewable technologies, the energy request has become more fluctuating.

Since the produced energy that is not sold, or used, is lost, researchers have been looking for solutions for this drawback, increasing the flexibility of the controlled part of energy producers. The arrival of competitive systems for the exploitation of renewable sources started a more and more intense process of research to confer a higher flexibility to fuel cycles that already exist.

This research led to the developing of new technologies, with the prerogative of keeping the efficiency of the cycle to acceptable values, even when it is not working at the top of its potentiality off-design.

Turbogas can, for example, be equipped with appropriate systems of Inlet Conditioning, to improve their efficiency in off-design conditions. The aim of this thesis is to compare two strategies of dispatching of the energy produced in a combined cycle,a MILP based optimization and a dispatching algorithm based on a nonlinear Combined Cycle Model. This is an advanced solution to integrate the high efficiency benefits of a pressurized SOFC with a renewable source.

The operative conditions of these analyses are based on the matching with an emulator rig including a T machine for tests in cyber-physical mode a real-time model including components emulated in the rig, operating in parallel with the experimental facility and used to manage some properties in the plant, such as the turbine outlet temperature set-point and the air flow injected in the anodic circuit.

The simulations shown in this thesis regard the assessment of an innovative control tool based on the Model Predictive Control MPC technology. The control targets consider both steady-state e. Moreover, different control solutions are presented to operate the system during fuel cell degradation. Massardo, Prof. Loredana Magistri, Dott. Edward Sabolsky. Solid oxide fuel cells, thanks to their high combined heat and power efficiency, long-term stability, fuel flexibility and low emissions, emerges as one of the most promising alternative sources of energy to meet the future challenges.

Although they are a good opportunity for a clean and efficient production of electricity, and they also can be used as electrolytes for carbon reuse and energy storage, they are not yet mature enough to be competitive for the actual market. Many researches have to be done to address issues such as durability and stability, tolerance to contaminants, versatility and high cost.

For this purpose, the role of additive manufacturing gains its relevance: timesaving, flexibility and, first of all, the possibility to handle sophisticated designs. In that regard, the possibility to control the pore structure through additive manufacturing, from macro to micro scales, which is impossible to be reached by conventional manufacturing technologies, makes it the perfect promulgator for SOFCs future progress. The aim of this thesis was the development of an automated control system for depositing layer-by-layer unique electrode materials at the Development of a simplified dynamic model of Bottoming Cycle for GT26 reheat turbine.

The adopted framework begins with some physical considerations on global HRSG structure, and then focuses on a specific application for a real plant, i. Moreover the model embodies some parameters, which are easily derived from historical data to enhance the forecasting capabilities of the software, resulting in a hybrid model which covers a high range of working conditions.

The whole model is designed to run in Excel environment to allow for extended use by people who have limited experience in advanced modelling software. The model so created has been handled through a training process based on 7 days of experimental data, in order to create the basis for true system flexibility. In the model under examination various useful measures have been implemented due to the complexity of the machine.

Therefore, the feasibility of this approach has been verified and results showed a faithful response against field data. Brouwer, Prof. In the last decades, due to the increasing necessity to produce energy with low emissions and using sustainable sources, the research is more and more interested in fuel cell systems. These are electrochemical devices that allow to transform potential chemical energy into electric power with high efficiencies thanks to the possibility to avoid passing through the mechanical energy and so through the Carnot efficiency limit as the traditional engines.

Among the several applications of the fuel cell, this thesis is about the aeronautical field that should be investigated in order to reduce the greenhouse gasses produced by the jet engines. In fact, in the next few years, the air traffic is supposed to double up, and also the layer of the atmosphere in which these gases are released makes them even more dangerous for the environment.

After taking into account different plan configurations were calculated the performances and the related emissions for feasibility verification. Prototyping of self-learning algorithms for the tuning of gas turbine combustion. This thesis work in related to the field of research and development of increasingly efficient and intelligent gas turbine regulation systems.

The research project was carried out during a six-month internship at the Ansaldo Energia S. Service department. The particular purpose of this work was to identify control solutions that allow to provide predictive characteristics to the regulation logics of the AE These phenomena are stemmed by making corrections to the machine regulation parameters i.

In the first solution, the problem was faced with a traditional approach, that is based on updating a multidimensional matrix that contains the dependence of the corrections on environmental and operating conditions.

To test this solution, various plant engineering possibilities were investigated, the use of different logics and the influence of some parameters of the model. Furthermore, also in this case various plant solutions have been tested. To test both cases, historical measurements made in the plant were used. The electricity production and dispatch in the national and international grid are facing a phase of great transition due to the increasing presence of non-programmable renewable sources.

The resulting critical issues lead to the development of increasingly efficient solutions for the flexibilization of traditional thermoelectric plants. This thesis deals with the development and validation of a butane heat pump model, the core of the European PUMP-HEAT project that offers innovative solutions for the flexibilization of combined cycles both in power oriented set-up, which is the focus of this thesis, and in cogenerative configuration.

Design and implementation of software environment for modeling and dynamical simulation, applied to marine and space fields. The development of the project under examination started from the request, submitted by Thales Alenia Space, for a modeling system able to simulate the dynamical behavior of an unmanned floating vehicle, equipped with a manipulator arm, for recovery of cooperative body or not purpose, operating in space environment. The design of the above-mentioned began from the one made available by Graal Laboratory, thanks to the important similarity between marine and space environment.

The extension to elastic case has been treated after having defined the full-rigid model, having implemented it in code using object-oriented MATLAB language and having verified its correctness. More specifically, the above-mentioned extensions have been realized considering a joint-concentrated elastic response, small deformations hypothesis has been assumed. After that, following the aforementioned procedure defined referring to the full-rigid case , the elastic model has been implemented in the software and its correct response verified.

An exemple of operative simulation has been provided. Upon completion of the project under evaluation, it will proceed to the determination of specific calibration methods to approximately determinate the characteristic parameters of the simulation, of the main body and, furthermore, the identification of specific problems regarding the control system design and implementation.

This section will be object of the continuation of this thesis project, because of that it will not be presented on this. Emulator plant of turbocharged SOFC systems: preliminary experimental tests. The topic of this thesis concerns the development of an emulator rig of systems with solid oxides fuel cell SOFC pressurized with a turbocharger.

The activities involved the conduct and analysis of preliminary tests, to make changes to improve its operation: in particular, the behaviour of the various components valves, sensors, heat exchangers, turbochargers, combustors, tank was analysed under certain operative conditions. The results have led to the final definition of the structure, ensuring that it works properly and the ability to perform subsequent planned tests.

Static and dynamic validation of a fuel cell model operating in the Transeo environment. Students: Stefano Costini, Micheal Filippone. The operation of the fuel cell and the main types are listed. The principles and the physical and mathematical equations underlying these alternative devices used for the production of electricity are explained.

All the internal components of the device are analyzed and explained, plus any external components that improve or are necessary for the operation of the fuel cell. The mathematical model used for the simulation of the device are discussed. The validation is carried out on the basis of experimental data.

To support the validation, it was decided to carry out a comparison with a previous validated fuel cell model, the model in question was successfully validated in the Simulink environment. The results of the validation were positive and allowed to make improvements to the fuel cell model operating in Transeo. The reasons that led to the discussion of this topic are reasons related to ethics and morality, we have the need and the duty to change the world by taking the path of energy eco-sustainability.

Dispatching and balancing services market analysis through statistical analysis and machine learning platforms. The following thesis derives from the collaboration between the University of Genoa and the Genoese company Ego S. The objective is to analyze the data, made public by the Electricity Market Operator GME on its website, relating to the Dispatching and Balancing Services Market with the aim of highlighting its main characteristics.

The analysis focuses mainly on prices and volumes traded on these markets, highlighting them divided by area, time and type of plant. To this end, the Rulex machine learning software was used, through which the data were synthesized and made available for import into Excel. Through this last tool, numerous illustrative graphs were obtained, from which it was possible to elaborate important reflections and comparisons.

Carbon capture, utilization and storage is nowadays regarded as a crucial technology, which will play a key role in tackling various climate change issues. In particular, with respect to the emission of CO2, the main greenhouse gas, its conversion into gaseous or liquid fuels is considered one of the viable options for the storage of renewable energy and to ensure energy security.

This thesis aims to assess and compare possible routes for renewable methanol synthesis, from both a technical and an economic standpoint. Specifically, carbon-rich streams were considered as the feedstock for the process, with a focus on the tail-gas from pressure swing adsorption PSA unit of hydrogen plants, which combines the possibility of large scale applications with relatively low capture costs.

A model for methanol synthesis was implemented in Aspen Plus and used to investigate the plant performance under different operating conditions and feed compositions, ranging from CO2-rich to CO-rich syngas streams. Simulations provided a clear insight into the thermal and electrical energy requirements of solid oxide electrolyzers. The influence of cell temperatures and pressures on the product gas composition of the solid oxide electrolyzer reactor was analyzed. Finally, a cost analysis for several tail-gas to methanol pathways was performed to evaluate the overall economics of the process, identifying the range of electricity prices that would make a process based on CO2 capture, electrolysis for the generation a CO2-rich syngas, and a conventional methanol reactor competitive with current industrial methanol production.

Experimental data analysis on a ducted wind turbine installed at the Genova-Voltri port. This study will analyse the installation of an innovative ducted wind turbine, located at the dam of the harbour of Genoa Voltri. The interest in investing in this new technology, is related to the increase in energy demand and to the necessity of exploiting the potential of renewable energy sources close to end users, making them independent from the energy point-of-view.

The subject of the analysis, as previously introduced, is a wind turbine, with a ducted-flow innovative design, having the rotor blades in the throat section of a convergent-divergent duct. This special-designed machine has as major advantage the possibility of exploiting the velocity increase in the convergent duct, allowing for energy production even at low-speed wind conditions and for better performance in terms of produced power if compared with a traditional wind turbines.

The objective of this thesis is to carry out a feasibility study by means of an appropriate monitoring campaign of the wind intensity and direction in the installation site. The results obtained in oper environment are compared with the performance measured in a previous experimental campaign, carried out at University of Genova wind tunnel.

More in detail, the performance of the proposed ducted turbine are compared with a standard wind turbine configuration and the effect of the yaw angle on energy production is investigated. Finally, the possibility of increasing the power generation from renewable energy sources, is analysed as well, considering the installation of photovoltaic panels on the external surface of the duct. This thesis concerns closed-loop systems for energy storage, including CO2 in supercritical conditions.

The plant design and the initial hypotheses regarding the thermodynamic parameters were extracted from the patent by Eng. Finally, also water was treated as an evolving fluid, varying the plant configurations to find the most appropriate.

Then, the analyzed parameters were compared to evaluate which advantages and disadvantages can be associated with the various systems. For the calculation of the thermodynamic characteristics of fluids, CoolProp 6. In particular in the present thesis the software Spyder is used, that is an open source integrated development environment for scientific programming in Python language. This work is focused on the study and analysis of the operation of the Allam cycle, an innovative and highly competitive electricity production plant.

In a historical period in which the need to reduce polluting emissions and the effects on the climate is becoming increasingly essential, this plant can represent a huge potential in the future production of energy with low environmental impact. The Allam cycle, indeed, allows to produce electricity while maintaining zero CO2 emissions, ensuring high efficiency and low production costs.

In this paper, the general characteristics of the operation of the plant fueled by natural gas and its thermodynamic analysis are initially presented. Subsequently, the project of the Allam cycle powered by solid fuel is described, in particular, the coal-fired plant is analyzed. A performance analysis is then carried out for a case study of a simplified cycle through the use of Matlab software.

The scheme of the reference cycle is described and then the analytical expressions necessary to complete the analysis are obtained. Finally, the study of the relationships between the operating parameters and the performance of the system is discussed to evaluate the conditions for its optimization. Analysis of the malfunction, repair and restart of a steam turbine of a biomass-fired cogeneration plant. The reparation of a steam turbine is one of the historic argument about energy engineering.

It is almost impossible to come across something innovative regarding this topic. On this basis, the performance calculations were developed and the corrective actions to be taken were verified. This thesis focuses on the development of a new laboratory specialized in the study of innovative energy system components. Different factors were considered for the project. In the first instance the laboratory wall was designed taking into account the fireproof aspects.

The system layout and its possible configurations were eventually examined to find the best solution for the laboratory in terms of flexibility for the study of the energy system innovative components and its possible future modifications.

Development and evaluation of a test stand for solid oxide fuel cells fed by hydrogen and coal syngas. Massardo, Dr. West Virginia University, in conjunction with U. Coal is a very diffused resource, and its utilization through FC will provide high performances and low emissions.

SOFCs are currently the most promising energy system for the future: they have higher efficiency than any other solution and a good fuel flexibility and they can also work as electrolyzer for the co-electrolysis of CO2 ad H2, enabling carbon reuse and energy storage. High cost and short lifetime are preventing their diffusion, for this reason, further researches are crucial to increase their commercial competitiveness.

The aim of the thesis was to build from scratch a new testing platform to allow long-term test and analyze the degradation of SOFC fed with synthetic coal syngas. This project involved practical work, such as the realization of pipelines, structures to hold tube and manifolds in position, and computer work, like Labview programming and data post processing. To chase the goal, evaluating short-term tests were performed during the development, to verify the actual progresses, identify possible issues and solve them.

Furthermore, these preliminary tests allowed the preparation of safety testing protocols, to reduce failure risk and optimizing the fuel cell preparation. In addition, some tests gave interesting results, comparable with the ones obtained in published papers, thus the measures taken were reliable and so was the system.

At the end of this thesis work the test stand needed a few improvements to be considered ready for long-time tests and some data from them could have been reported. Unfortunately, the lockdown has slowed down the advancement, preventing the completion. Students: Michele Rebuffo, Omar Gamberini.

A research of system to improve system flexibility has begun and it led to the development of systems that keep the efficiency at an acceptable level, even if the system works in off-design. In this work a combined cycle, that uses a refrigeration system with absorption as an inlet cooling technology to improve its flexibility, has been analyzed.

This thesis purpose is to obtain a dispatching logic to have the best economic performances. It started from an existing logic that has been improved with an optimization to further increase the earning obtained from the inlet cooling technology. In the end the results have been analyzed, considering the absorption system installation cost. The present thesis aims to analyze some challenges that the maritime sector has to face in order to mitigate its environmental impact. At present, the maritime sector is fueled mainly by internal combustion engines, which employ oil-derived fuels, with a relevant environmental impact.

In this context the use of low environmental impact fuels is a key point. One of these fuels is methanol, widely analyzed in the course of this thesis. After an introductive section, in which methanol production and reforming techniques are studied, its use both for small and large boats is investigated; in the first case, the methanol reforming process is performed on board to obtain a hydrogen-rich gas ready to be fed to PEM fuel cells, while in the second case methanol is employed as a fuel in internal combustion engines.

Finally, the HELM software, developed by a group of researchers from the TPG Thermochemical Power Group of the University of Genoa, is employed to investigate some possible scenarios, considering a large scale ship as a case study. Traverso, Prof. Turbomachines have various applications and their operation and efficiency are of general interest in the technical field. Any idea can be important to reduce the environmental impact and thus build a more eco-sustainable world.

One of these ideas was created by Nikola Tesla, in the study of a friction turbine, through the new concepts of energy transfer, using the properties of fluids such as viscosity, adhesion and cohesion instead of the energy transfer mechanism of traditional turbines. A difference of turbines for power plants or aerated turbines, the Tesla lends itself to small applications, for the production of distributed energy.

In this work will be presented, the characterization of an electric generator powered by a Tesla turbine. The variations that this machine will produce during its operation will also be studied. The topic of this thesis concerns with the experimental emulation of systems based on a solid oxide fuel cell SOFC pressurized with a turbocharger. Some preliminary tests and the definitive tests of the demonstrations of the aforementioned plant have been carried out and analyzed.

The plant is characterized by a turbocharger coupled to a pressurized volume that simulates the typical thermal and fluid dynamic phenomena of a SOFC fuel cell. The activity of this thesis consists of preliminary and final tests, with a consequent study of the real functioning of the coupling of the various components, analyzing the graphs of the main quantities temperature, pressure mass flow and rotational speed.

The analyzed tests in this thesis have concerned with the demonstration of the proposed technology and its control system. Surge is recognized as the most significant flow instability of the compressor stall and surge as it strongly generating risk conditions causing pulsations of pressure that generate reversal flow. This phenomenon obviously must be taken into consideration when designing and operating systems.

Therefore, the prediction of the surge occurrence, with its characteristic oscillations, is a crucial aspect which has acquired high consideration in literature. This thesis deals with the analysis of the surge approaching zone of the compression system with three different volume configurations.

A surge prevention tool based on the vibro-acoustic analysis has been developed in the LabView programming language. Vibrational data from a gas turbine connected with three different volume configurations were used as input of the software to find its best internal parameters.

The increase of the vibration contents in the data was used to develop precursors which can highlight the approach of this unstable operative zone. This diagnostic software can be used for anti-surge control systems of advanced cycles where a gas turbine is connected to an additional external component is responsible for volume size increase.

Increasing the operational flexibility of combined cycle power plants by modulating the suction temperature. With the intention of improving the off-design performance of combined cycle power plants, an option to proceed is by modulating the temperature of the air at the inlet of the turbogas system. To do this, without having pressure losses due to the heat exchanger tubes when it is unnecessary to modulate the temperature, a cross-flow heat exchanger solution has been proposed, where the pipes are replaced by liquid jets.

We then proceeded by analyzing what are the breaking conditions of the liquid jets invested by a gaseous crossflow, and subsequently in what conditions the best heat exchange is achieved; in addition, a quantitative study was carried out on pressure losses and a study was made of how these three aspects of the heat exchanger as well as the geometric parameters of the heat exchanger itself vary depending on the decisions on the values of the major design parameters, which have been identified in the diameter and the speed of the jet, in the undisturbed speed of the air that hits the jets in crossflow, and in the pitch between two jets.

This hybrid power plant represents technology that enables the highest possible efficiency on fossil fuels. The U. Department of Energy, National Energy Technology Laboratory NETL has focused on the potential flexibility of these systems to accommodate increased Penetration of intermittent renewable generation on the national electric grid. This would significantly reduce costs while maintaining high efficiency.

Parametric design point studies were completed by NETL to select some of the more promising cycles in terms of fuel utilization factor, power split, anode recycle, reformer geometry and location, and air preheat strategies. This thesis includes system performance efficiency, etc.

Overall, simulations were conducted, representing a significant contribution to the hybrids research community. Development of the data acquisition system and the thermal insulation for an emulator plant of turbocharged SOFC systems.

During the activities of this thesis, I participated in the installation of various mechanical and electronic components of an emulator plant designed to study turbocharged SOFC systems. Furthermore, it was possible to collaborate to manage some preliminary tests of the emulator rig.

The object of study of the following thesis is the Tesla air turbine, a particular type of machine capable of converting energy thanks to the viscous adhesion of the working fluid on a series of rotor discs, placed at an adequate distance from each other and keyed onto the shaft. The aim was to analyze the general operating parameters of the micro-expander, using a numerical model already used by the Thermochemical Power Group of the University of Genoa for the study of prototypes prior to the one investigated.

The first chapter introduces the turbine idea formulated by Nikola Tesla and traces the lines regarding the operation of the machine. The second chapter describes the prototype being studied while the test bench and the measurement instrumentation adopted during the experimental tests are the subject of the third chapter. Fourth and fifth chapters present the results of the experimental activity: first the analysis of the energy performance is reported, then the characterization of the vibrational behavior and the balancing operations carried out on the rotor.

Although research of this kind has already been carried out, important changes regarding the geometry and components of the prototype supplied made it necessary to start the experimental campaign. Sustainable technologies and fuels for clean energy production in maritime applications.

The present activity has been carried out with the aim of achieving an in-depth view of the challenges that stand before the maritime industry, which operates in a context that must reduce its environmental impact. With the recent establishment of Emission Control Areas and the new goals set by the International Maritime Organisation, an overall assessment of the available technologies is underway, in order to find feasible solutions for reducing pollution related to maritime transport.

Among the different fuels under evaluation, this study focused on methanol and ammonia. These solutions offer important potential advantages in terms of weight, volume and costs, which make them suitable for maritime applications, at the same time allowing for lower pollutant emissions compared to traditional technologies fuel oils. The data collected for the considered fuels have been employed to update the database of a marine application-oriented simulation tool called HELM, specifically developed by research group TPG Thermochemical Power Group at University of Genoa.

The analysis of different case studies has shown the competitiveness of methanol- and ammonia solutions both in present and future scenarios. The results of the simulations performed suggest that further investigation is required for the aforementioned fuels, since future development of technologies for marine applications is expected to provide new data.

Tesla turbines are special types of turboexpanders that produce energy starting from the viscous adhesion of the working fluid to the rotor disks parallelly placed at a fixed distance. The present thesis aims to improve the numerical model previously developed to study the prototypes, on which the Thermochemical Power Group TPG of the University of Genoa has conducted, and leads still, numerous researches.

This powerful tool allows a better understanding of the phenomena that govern the exchange of work and the sources of loss inside the Tesla-type turbines, allowing a more accurate design. The first chapter focuses on the idea presented by Nikola Tesla, on the basic operation of turbines and the state of art.

The second chapter briefly presents the previous works carried out by TPG, in order to contextualize the present thesis. In the third chapter is presented the analytical models, whose equations are implemented in the developed numerical model.

Finally, in the fourth chapter, is presented the structure and the outcomes of the MATLAB model, comparing the model outputs and the data available from analyzes conducted using Computational Fluid Dynamics CFD software. Energy from the sea: control and characterization of a pilot plant for sea waves generation.

The thesis activity is aimed at the development and implementation on PLC of new control systems of a plant for the generation of marine waves in real environment, located at the Naval Experimentation and Support Center C. The plant in question is a unique European model for its installation in an uncontrolled marine environment and is capable of producing waves up to 0. Particular attention was paid, through the new controls, to the resolution of problems related to the mechanical stress acting on the structure, anchored to the quay, in conditions of inversion of motion of the bulkheads.

First of all, a comparison was made between the control systems implemented and that already present in the plant. Subsequently, the complete characterization of the plant was carried out using one of the controls developed through an experimental campaign which allowed to investigate the potential of the machine on a sample of 18 tests.

The results were post-processed with the help of dedicated mathematical tools, after which a study was carried out aimed at identifying the wave profiles able to represent the sea states described by Douglas, both in the oceanic and Mediterranean areas, respecting the similarity of Froude.

Tesla turbines are special types of turboexpanders that produce energy starting from the viscous adhesion of the working fluid to the rotor disks, keyed on a shaft, and placed at a fixed distance between them. These turbines are considered innovative due to their potential low-power applications and with two-phase or impurity-containing fluids, particularly interesting is the possibility of using these machines as expanders in reverse ORC cycles. The present thesis aims to deepen the analysis on the sources of loss by using a numerical model previously developed to study the prototypes, on which the Thermochemical Power Group of the University of Genoa has conducted, and leads still, numerous researches.

The first chapter focuses on the idea presented by Nikola Tesla and on the basic operation of turbines. The second chapter briefly presents the numerical model and the prototypes of the machine to contextualize the present work from the theoretical and applicational point of view.

In the third chapter is presented the part of the numerical model implemented to describe the sources of loss on which the current analysis aims to focus. Some available CFD data has been used as training dataset for the data driven model, the fitting procedure is thoroughly investigated in Chapter 4.

This thesis focuses on the development of a methodology that could be used to predict thermoacoustic instabilities in the Mitsubishi Hitachi Power System MHPS gas turbine combustion system. Combustion instabilities arise in gas turbine combustors due to a coupling between fluctuations in the heat released by the flame and fluctuations of the flow field.

The prediction of the phenomena is here investigated by decoupling the study of these two interacting mechanisms. Thus, a geometry and operating conditions for a MHPS combustor where determined by reverse engineering information available from the public domain. The CFD results for cold flow simulation succesfully modelled the flow pattern and the recirculation zone. However, a representative combustion model was not obtained from CFD.

Consequently, two CFD models presenting blow-off issues were investigated in order to study this effect on the acoustic response of the system. In addition, the thermoacoustic investigation proceeded by determining FTFs from literature. This allowed a preliminary thermoacoustic analysis. In addition, a sensitivity study regarding the effect of mass flow variations is performed and discussed. Students: Dimitrios Bikeris, Francesco Cavalleria.

The use of alternative fuels as new energetic resources is one of the main challenges which characterize the XXI century. Among the different options considered, hydrogen as an energy vector is recognized for its numerous properties and in particular for its abundance in nature. So, in this thesis a storage system with metal hydride has been studied to know this method well, a technology which is not still widely used but which guarantees an appropriate security.

Consequently, the purpose of this paper is to create and implement a dynamic model of a storage system with metal hydride using the software Matlab Simulink, in order to be able to study the behavior of the system during the absorption and desorption of the hydrogen. At the end, several experimental tests have been made with a metal alloy-based on Lanthanum Nickel to be able to compare the data test with the data simulations, underlining the differences with the aim to improve both the implemented model and the development of the experimental tests.

Power plant flexibility enhancement through cold energy storage: performance evaluation in different operating conditions. Dias Martins. The overall project aims to improve combine cycles flexibility and global efficiency, in order to strengthen their role in balancing fluctuations of electrical market with a high penetration of renewable sources RES , reducing CO2 and pollutant emissions.

The analysis has been conducted with Ansys Fluent software, studying, under simplifying hypothesis, the thermodynamic of one of 2,8 m length TES finned tubes. A 2D axisymmetric numerical model has been realized in order to simulate the transient energy behaviour of the entire system consisting of glycol water inside the tube and ChrodaTherm 5, a phase change material PCM , outside the tube. In order to reduce the calculation time, due to the presence of fins in the geometry, a simplified model, 0, m long, has been created using the analysis of similarities.

It has been therefore necessary to verify that the model was actually representative of the real problem, comparing a prototype, easily achievable on Ansys Fluent, with the respective model, defined by the analysis of similarities, in terms of temperature distribution in water, in PCM and along all the geometry.

After validating the model, it has been used for the case study. At the end, as the required power values have been not reached for all operating conditions, possible improvements have been studied. During the activity carried out for this thesis, a model was implemented using the Simulink program and the Stateflow library in order to obtain a duplicate of the plant control of the system present in the HI-SEA laboratory of the University of Genoa in the Savona Campus.

Hydrogen, stored in tanks pressurized at ???????????? The maximum electrical power that can be produced is about ???????? The electrical power produced is dissipated into heat by resistor banks and the heat is taken away by an air-cooling system. Two cooling circuits are used to manage the temperature of the stacks: the primary circuit, that takes away heat from the stack, is connected to the secondary cooling circuit by a plate heat exchanger.

The logic of the PLC is schematized in the workflow that was used to implement the Stateflow model. After some corrections, it has been obtained a model that can simulate, in single o multi stack configuration, the behaviour of the bypass contactor and of the heater of the cooling fluid, the active states in the control procedure and, also, the alarms that cause the shutdown of the system.

Moreover, thanks to the model it has been possible: to identify some problems of the measuring devices and of the data acquisition system, to highlight the necessity to record the start and stop commands given by the user and, eventually, to conclude that it could be better to acquire the minimum cell voltage with a low sampling time.

In future works the Stateflow model could be connected to the power plant in order to have a simultaneous simulation of the control logic. The aim of this thesis is to establish a strategy of dispatching of the energy produced in a combined cycle, assessing the influence that ambient temperature has on the fundamental parameters of the plant and implementing the variations gained by increasing flexibility on technical, economic and environmental parameters.

The purpose of this thesis is to analyze the different possible applications of fuel cells in harbor and marine sectors. Afterwards, in order to analyze the possible port applications, it will be shown how the ports of Los Angeles and Long Beach in California have encouraged the use of the hydrogen technology and the use of hydrogen-fueled trucks for the cargo movement sector within an emissions reduction plan for the abatement of the pollution caused by the port activities.

Together with the analysis of the possible port applications, the state of art of fuel cells marine applications is presented, showing how this technology is not yet ready to be used in order to reduce the pollution caused in ports by ships. The reason for which this thesis is focused on possible port applications of fuel cells is to highlight a path to fuel cells commercialization.

Infect, encouraging the hydrogen technologies use in and nearby port areas is expected to ease the diffusion of the hydrogen-fueled vehicles, leading to the lowering of prices and to the initial construction of the hydrogen delivery infrastructures. The thesis ends with a study on the port of Genoa, where a European port implementation plan is presented. It is part of the plan, infect, the creation of an LNG trucks shuttling service for the port cargo movement.

Therefore, it will be evaluated the electrical power needed to produce and compress the hydrogen necessary to fuel, instead of the LNG trucks, a shuttling service consisting of hydrogen-fueled trucks. Afterwards, it will be evaluated how many 3 MW wind turbines should be needed to provide such power. The present thesis has as objective the development of an aircraft to be remote controlled by automated management of the flight. The automation path starts from the configuration and positioning of the components made available by JP drones and then establish the flight and safety parameters essential for the operations that will be carried out during and after the development of the project.

The reasons for the development of the UAV in question are the flexibility and ease of customisation of the final product based on an Open Source platform, with lower price than the competition but of better quality, after completion of the configuration; moreover this hardware platform has a vast range of advanced and innovative sensory, factors that slow down the obsolescence of the model.

The development of the prototype required computer and aerodynamic knowledge, because in order to effectively improve the drone it has been necessary to carry out tests on the ground and multiple flight tests analyzing the data collected in flight and recognizing the effects derived from an incorrect configuration and phenomena aerodynamics on the model. Finally, we arrived at the final mapping tests, easy to perform but extremely dependent on the quality and stability of the flight.

The aim of this work is to simulate the behaviour of a PEM-type fuel cell through the developed knowledge and the learned programs during this Degree course: the particular developed model will be presented and a good consistency is observed with the experimental results that allow validation. Particular interest will be on the power and tension of the cell. A cell upstream mixer is also implemented to obtain starting conditions for the design of an anodic ejector. This component, already in the system, is completely unknown, because of the impossibility of placing adequate probes and studying its actual behavior; therefore, the design of the ejector is the first target, towards a more accurate knowledge of its very operation.

The aim of this work is to assess the technical feasibility of integrating a high-temperature heat pump into a gas turbine combined cycle power plant working in Combined Heat and Power CHP mode with a District Heating Network. The IREN power plant in Turin is assumed as case of study, as described in the Chapter 2, different layout solutions are taken into account, they are modelized , and the most efficient of them will be highlighted.

Technical-economic analysis of energy storage systems: hydrogen and electrochemical energy packs. In a world characterized by the greatest technological revolution in human history, it is of primary importance to research, study and implement energetic changes. The current primary sources of energy, oil, natural gas and coal, have two main deficits. First of all, they have no long-term sustainability, if analyzed in relation to the reserves and volumes of hydrocarbons required in the coming decades by countries in strong development.

They also have a very high environmental impact, a topic that is nowadays foundamental, not only on a technical view but also and above all of an ecological-social aspects. One solution is represented by the deployment of the renewable energy, which requires affordable energy storage. The following work is aimed at analyzing two different types of energy storage, electrochemical and hydrogen, in particular for supplying auxiliaries of medium sized pleasure craft.

The energy that powers the system is renewable: solar, hydraulic and wind, and is integrated into the boat. The paper is divided into two phases: in the first one a market analysis and a technical analysis were carried out to understand the state of the art, a substantial database was built which has allowed to analyze and compare the main parameters that can be considered important technical and economic indicators.

The second phase focused on an economic analysis that allowed us to analyze the feasibility of the application of the technologies in question, also comparing investment costs and operating costs. The purpose of this thesis is the general analysis of a Tesla turbine produced by AxeFactory Metalworks, a company located in Tortona and owned by Raffaele Spezia, After describing the project of the spin-off of the University of Genova which deals with the turbine, we focused on its description.

Subsequently the test bench and the instrumentation used for the experiments have been illustrated; the so obtained results have been re-elaborated in order to deduce the performance and the vibrations of the prototype. This kind of studies has already been conducted by the University of Genoa, but this experimental campaign is different from the others because of the bigger dimension and the larger number of disks of this turbine.

This paper may be seen as a starting point for more detailed analysis about the Tesla turboexpander and its possible applications in the industrial field. The aim of this study is the development and the characterization of a sperimental system for the generation of sea waves in a controlled environment installed at Centro Supporto e Sperimentazione Navale C.

This work is included in the Sea-W. M project Seaspoon Wave Harvesting by Air Microturbine carried out within the framework of the National Plan for Military Research PNRM whose aim is the development of a prototype of an autonomous powered station for off-shore recharging electric loads. On top, a wavemaker was developed to test the system and also for future research activities in the area. Such a wavemaker with 5 m wave front and up to 0.

At first we proceded with the implementation of new abilities on the program logic to limit the mechanical stress caused by the movimentation of the blades and to render the generated wave characteristics more similar to real conditions; than we proceded on the characterization of the system with a sperimental campaign.

Finally we identified the most appropriated waves to scale the Douglas waves preserving the Froude similarity. Characterization of the microturbine Turbec T for inlet conditioning techniques. In the last years the higher penetration in the energy market of renewable energy has required an higher flexibility of combined cycle power plant.

This paper that carries out the characterization of microturbine T by using experimental data collected during laboratory test, is part of this project. This machine will be in fact used as a model for an Heavy duty combined cycle turbine during the test phase of the project. At the same time verification and sizing calculations have been made respectively on INT and HE1 heat exchangers, which are part of the same test rig. Regarding the microturbine, the influence of ambient temperature has been evaluated on its performance; in particular about the electric and thermal output, the fuel flow and the efficency of the machine.

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