Dissertations / Theses: 'Fuel system'

1

Shaffer, Christian Edward. "Flow system modeling with applications to fuel cell systems." Morgantown, W. Va. : [West Virginia University Libraries], 2005. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4198.

Full text

Abstract:

Thesis (M.S.)--West Virginia University, 2005.
Title from document title page. Document formatted into pages; contains xii, 111 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 100-102).

APA, Harvard, Vancouver, ISO, and other styles

2

Axfeldt, Daniel, and Johan Bruno. "Fuel Evaporation Control System." Thesis, Halmstad University, School of Business and Engineering (SET), 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-725.

Full text

Abstract:

Husqvarna AB uppmärksammade att det kommer införas nya miljöregler i Kalifornien gällande diffusionsutsläpp. De åkgräsklippare som går under namnet Rider och tillverkas av Husqvarna idag uppfyller ej dessa krav. Dagens bränsletank är tillverkad i plastmaterialet HDPE och avdunstande bränsleångor klättrar lätt igenom tankväggen ut i atmosfären vilket ej är tillåtet enligt de nya reglerna. Vi blev tillfrågade om vi kunde lösa problematiken och ta fram ett system som kontrollerar de avdunstade bränsleångorna och se till att detta system uppfyller de krav som ställs i Kalifornien.

Som blivande ingenjörer tyckte vi att detta var ett passande examensarbete med många olika områden involverade som materialkunskap, tillverkningsprocesser, produktutveckling samt inblick i ett större företags arbete.

Vi har med detta examensarbete tagit fram ett system som minskar det miljövådliga diffusionsutsläppet med cirka 90 %. Vi har arbetat med projektet så att det är klart för implementering samt gjort en modell som visar hur ett färdigt system kan se ut. Erfarenhet visar att de regler som uppkommer i Kalifornien sedan sprids till övriga USA. Även Europa förväntas skärpa sina diffusionsregler. Detta gör att vår lösning kan få en betydande spridning och få stora positiva effekter på miljön.

APA, Harvard, Vancouver, ISO, and other styles

3

Taylor, Rachel Jennifer. "Virtual fuel cell system." Thesis, University of Newcastle upon Tyne, 2014. http://hdl.handle.net/10443/2749.

Full text

Abstract:

The purpose of this project was to build a computer model able of running virtual simulations and emulations of fuel cell (FC) systems. This was aimed at the transport market and modern built environment. The project incorporates the novel use of hardware, firmware and software operating in real-time to simulate real applications in vehicles and buildings. A fuel cell system is a complex assembly of components, all of which are all critical to its performance. To get the best from the system each of the system components must be optimized. Current practice uses prototyping of real hardware and testing. Such work is specific to single FC suppliers and is based on off-line modeling or real-time analysis against monitored loads. The innovation in this project is in integrating the optimization step into the development of the complete system. The technical breakthrough is shown through closing the development gap between concept and final design by creating a real-time simulation and emulation process to develop optimum FC systems for the transport and built environment markets. The virtual fuel cell can be operated safely outside the limits that it would normally encounter for given criteria. This extends the know-how beyond conventional testing. The time consuming and costly setting up of hardware tests with an actual fuel cell is therefore not required. This project outcome gives the new ability to design and engineer optimized FC systems without the risk of component / subsystem redundancy. It relinquishes the requirement for a hydrogen source, cooling; pumps, water etc. and gives rise to a completely safe test environment.

APA, Harvard, Vancouver, ISO, and other styles

4

Fredriksson, Robert, and Milovan Trkulja. "Fuel Efficiency in AWD-system." Thesis, Jönköping University, JTH, Mechanical Engineering, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-1589.

Full text

Abstract:

This degree project has been made in cooperation with engineers working for GM Engineering/Saab Automobile AB in Trollhättan. The given name by Saab for the project is “Fuel efficiency improvements in All Wheel Drive(AWD)-system”. The main tasks of this thesis work were to investigate the size of the power losses in different parts on the propeller shaft, to design a computer program that calculates

coordinates and angles on a propeller shaft and to investigate the possibilities to put together a simplified formula that calculates the natural frequencies on a propeller shaft.

The main parts of this report are a compilation of the theory about AWD and mostly about the parts on the propeller shaft, and also a description of the developed computer program called Propeller Shaft Calculator. This report doesn’t concern power losses in the different joints because there were no such general equations to be found. The most common way to calculate the power losses inside a joint is to do tests were the power loss is measured at different angles, torque and speed and then use that data to put together an approximated equation.

Most of the work on this project has been on theory studies and on programming. The main result of the project is the program Propeller Shaft Calculator.

Propeller Shaft Calculator is a program that is designed in Microsoft Excel. All the menus are programmed in the visual basic editor in Excel. The program is supposed to be used as a help while designing new propeller shafts.

Propeller Shaft Calculator can calculate all the coordinates, lengths, angles and directions on a propeller shaft. It also calculates natural frequencies, plunge, estimated power loss on the second shaft and angles in the joints. In the program you can choose to do calculations on four different configurations of propeller shafts but can quite

easy upgrade the program with more choices.

Basically the program works like this:

First you choose the right propeller shaft in the main menu. Then you fill out the indata sheet with coordinates, lengths, material data and so on. As you type in the input data the output data will appear in the out-data sheet next to the in-data. Every propeller shaft has also a calculations sheet were more detailed calculations can be

found.

The program also has a built in help function and a warning function that lights a warning sign next to the values if they are outside the limits.

APA, Harvard, Vancouver, ISO, and other styles

5

Thomas, Alex S. M. Massachusetts Institute of Technology. "An analysis of distributed solar fuel systems." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/76511.

Full text

Abstract:

Thesis (S.M. in Engineering and Management)--Massachusetts Institute of Technology, Engineering Systems Division, System Design and Management Program, 2012.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 85-89).
While solar fuel systems offer tremendous potential to address global clean energy needs, most existing analyses have focused on the feasibility of large centralized systems and applications. Not much research exists on the feasibility of distributed solar fuel systems. This thesis is an attempt to understand the larger context of solar fuel systems, to examine the case for going distributed and to critically analyze a distributed solar fuel system available today in the context of a specific application. In doing so, this thesis seeks to a) provide a baseline analysis for the economic feasibility of a distributed solar fuel system based on state-of-the-art technology b) draw some general conclusions about the nature of such systems in order to provide guidance to those engaged in the development of the next generation of solar fuel systems. This study also compares the chosen baseline solar fuel system with a traditional fossil fuel-based alternative and undertakes a cost-to-emissions trade-off analysis. A key finding of this thesis is that for solar fuel systems to be viable, cost and efficiency improvements in individual sub-systems won't be sufficient. Due attention needs to be given to bring down cost of the entire system. Another key finding is that if carbon emissions are considered as a decision-making criterion in addition to cost, even at current cost levels photovoltaic hydrogen systems compare favorably with existing fossil fuel-based alternatives such as diesel generators.
by Alex Thomas.
S.M.in Engineering and Management

APA, Harvard, Vancouver, ISO, and other styles

6

Bradley, Thomas Heenan. "Modeling, design and energy management of fuel cell systems for aircraft." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/26592.

Full text

Abstract:

Thesis (Ph.D)--Mechanical Engineering, Georgia Institute of Technology, 2009.
Committee Chair: Parekh, David; Committee Member: Fuller, Thomas; Committee Member: Joshi, Yogendra; Committee Member: Mavris, Dimitri; Committee Member: Wepfer, William. Part of the SMARTech Electronic Thesis and Dissertation Collection.

APA, Harvard, Vancouver, ISO, and other styles

7

Hard, Kevin. "PEM fuel cell multi-phase system." Thesis, University of Nottingham, 2005. http://eprints.nottingham.ac.uk/13198/.

Full text

Abstract:

This thesis presents an experimental investigation into the feasibility of using a functionally thermal fluid to enhance the performance of a Proton Exchange Membrane (PEM) Fuel Cell. Specifically, a fluid was developed that utilised a liquid-solid phase change to enhance heat transport within the fuel cell. Increasing the convective heat transfer coefficient could permit the use of smaller volumetric flow rates and reduce pumping power. The objective of the thermal fluid was to create isothermal conditions across a fuel cell and to reduce parasitic loadings from pumps and other components to enhance the overall system performance. Additionally, the fluid could reduce the system size and component cost, and stabilise temperature fluctuations within the system. The thermal fluid that was developed constituted a mix of fine, Microencapsulated Phase Change Material (MicroPCM) particles suspended in a single-phase working fluid. For successful integration with the fuel cell, the microPCMs thermal and fluid properties, and their effectiveness in transferring heat, had to be fully characterised and understood. Research consisted of experimental investigations of the fuel cell, followed by microPCM development. Experimentation on the fuel cell stack revealed a requirement for thermal stability and reduction in parasitic load from the pumps. Quantitative characterisation and development of the microPCM properties involved state of the art equipment to measure the latent heat of fusion, melting and freezing points, surface morphology and viscosity of the microPCM slurry. The effects of repeated use of solid to liquid phase change particles upon melting and solidification were studied. This lead to the further development of microPCM particles and experimentally examined in a fuel cell system. The use of MicroPCM developed in this study balanced the improvement in thermal capacity of the fluid with the increase in pumping load, when compared to the use of water alone. The study suggested that with further development of the microPCM slurry, it has the potential to significantly increase the thermal capacity of the fluid and stabilise temperatures across the fuel cell, which in turn would results in improved stack performance and electrical conversion efficiency.

APA, Harvard, Vancouver, ISO, and other styles

8

Kroll, Douglas M. (Douglas Michael). "Using polymer electrolyte membrane fuel cells in a hybrid surface ship propulsion plant to increase fuel efficiency." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/61909.

Full text

Abstract:

Thesis (Nav. E.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering; and, (S.M. in Engineering and Management)--Massachusetts Institute of Technology, Engineering Systems Division, System Design and Management Program, 2010.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 59).
An increasingly mobile US Navy surface fleet and oil price uncertainty contrast with the Navy's desire to lower the amount of money spent purchasing fuel. Operational restrictions limiting fuel use are temporary and cannot be dependably relied upon. Long term technical research toward improving fuel efficiency is ongoing and includes advanced gas turbines and integrated electric propulsion plants, but these will not be implemented fleet wide in the near future. The focus of this research is to determine if a hybrid fuel cell and gas turbine propulsion plant outweigh the potential ship design disadvantages of physically implementing the system. Based on the potential fuel savings available, the impact on surface ship architecture will be determined by modeling the hybrid fuel cell powered ship and conducting a side by side comparison to one traditionally powered. Another concern that this solution addresses is the trend in the commercial shipping industry of designing more cleanly running propulsion plants.
Douglas M. Kroll.
S.M.in Engineering and Management
Nav.E.

APA, Harvard, Vancouver, ISO, and other styles

9

Swedenborg, Samuel. "Modeling and Simulation of Cooling System for Fuel Cell Vehicle." Thesis, Uppsala universitet, Elektricitetslära, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-326070.

Full text

Abstract:

This report is the result of a master’s thesis project which covers the cooling system in Volvo Cars’ fuel cell test vehicle. The purpose is to investigate if the existing cooling system in the fuel cell test vehicle works with the current fuel cell system of the vehicle, in terms of sufficient heat rejection and thus sustaining acceptable temperature levels for the fuel cell system. The project also aims to investigate if it is possible to implement a more powerful fuel cell system in the vehicle and keep the existing cooling system, with only a few necessary modifications. If improvements in the cooling system are needed, the goal is to suggest improvements on how a suitable cooling system can be accomplished. This was carried out by modeling the cooling system in the simulation software GT-Suite. Then both steady state and transient simulations were performed. It was found that the cooling system is capable of providing sufficient heat rejection for the current fuel cell system, even at demanding driving conditions up to ambient temperatures of at least 45°C. Further, for the more powerful fuel cell system the cooling system can only sustain sufficient heat rejection for less demanding driving conditions, hence it was concluded that improvements were needed. The following improvements are suggested: Increase air mass flow rate through the radiator, increase pump performance and remove the heat exchanger in the cooling system. If these improvements were combined it was found that the cooling system could sustain sufficient heat rejection, for the more powerful fuel cell system, up to the ambient temperature of 32°C.

APA, Harvard, Vancouver, ISO, and other styles

10

Chan, Yeuk Him. "A self-regulated passive fuel-feed system for passive direct methanol fuel cells /." View abstract or full-text, 2007. http://library.ust.hk/cgi/db/thesis.pl?MECH%202008%20CHAN.

Full text

APA, Harvard, Vancouver, ISO, and other styles

11

Duboc, B. "The effect of fuel additives on diesel fuel delivery system and combustion performance." Thesis, University College London (University of London), 2014. http://discovery.ucl.ac.uk/1455626/.

Full text

Abstract:

The thesis presents an investigation of several aspects of fuel additive performance, including the effects of additives on the pump torque required to deliver high pressure fuel to engine injectors, the fuel droplet size distribution at sub-zero diesel fuel temperature, when wax formation occurs, and the ignition delay of diesel fuel combustion in an engine as well as constant volume combustion vessel. Exhaust emissions due to fuel additives were also investigated in an engine. A pump torque rig was designed and commissioned to investigate fuel additive performance at various pump speeds, fuel delivery (common rail) pressures and fuel temperatures, including sub-zero temperatures at which fuel waxing occurs. An existing constant volume combustion vessel was adapted to allow observations of fuel spray with additives and it was used for spray and combustion investigations. Various components of the combustion vessel were modified to support the fuel spray instrumentation. Also, a sub-zero fuel temperature system was developed to allow fuel to be cooled down for investigations; finally, a fuel pressure intensifier was designed which allowed ease of dismantling and thorough cleaning so as to eliminate additive cross-contamination between successive tests with additives. Results have shown that in general, additives have very small effects on many aspects of the fuel delivery system performance when the primary purpose of the additive is not related to the fuel delivery system. That is, there are virtually no side effects on pumping system performance from additives not intended to affect this system. This is mainly due to the small quantity in which the fuel additives are added, which is too small to affect any of the overall fuel properties. Additionally, it was proven that a constant volume combustion vessel is unsuitable to carry out combustion performance tests on fuel with additives, due to the high error in test repeatability. In contrast, the engine tests were able to reveal the effects of several combustion modifying additives on engine combustion performance and exhaust emissions. The fuel spray analysis at sub-zero temperatures revealed that wax formation was not the likely cause of an increase in droplet size but, instead, the likely cause is an increase in fuel viscosity.

APA, Harvard, Vancouver, ISO, and other styles

12

Glaad, Gustaf. "Pressurizing of high-pressure fuel system forsingle cylinder test cell." Thesis, Karlstads universitet, Institutionen för ingenjörsvetenskap och fysik (from 2013), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-74432.

Full text

Abstract:

This master thesis covers the development of a high-pressure fuel system for compression ignitedfuels such as diesel and diesel-like fuels that will be deployed into a single cylinder test cell at AVLMTC Södertälje, Sweden. The test cell is used by AVL to conduct research and testing of new fuelsfor their customers and this new fuel system will widen the span of fuels able to be tested by theequipment.This thesis focuses on pumping and pressurizing of the fuel, ensuring that all ingoing materialsare non-corrosive in this environment and compatible with the necessary fuels and lastly a safetyanalysis of the system with respect to operator and process safety. Other aspects of the projectsuch as mass flow measurements and fuel conditioning is covered in a sister thesis Mass flowrate measurement of compression ignition fuels in high-pressure stand-alone pump unit for singlecylinder test cell written by C. Aksoy [1].The goal of this thesis project was to deliver a finished manufactured fuel system and if the timeallowed for it, also validate its performance and finally installing and incorporating it into the singlecylinder test cell. The development process started with the writing of a product specificationoutlining the requirements and request on the product in a specification of requirements matrix andrelate these to product properties of the system using a quality function deployment (QFD) matrix.This document was then used as a base for further advancement in developing concepts to solveeach product property and weighing these concepts against each other using Pugh’s matrices. Thechosen concepts were then further developed, a flow chart for the system was developed as well asfuel lines and other supporting components were analyzed and chosen.In the end the high-pressure fuel pump from Scania’s XPI fuel system were chosen as well asa pressure transducer in the HP1000 series from ESI. Within the time frame of this thesis, theproject did not end up getting finished to the degree planned, but due to time constraints werehalted before starting manufacturing of the system. Some minor component choices remained aswell as documentation such as drawings and finalizing the physical layout of the system remained.All information regarding the remaining work needed to finalize the project and deploying thesystem in the test cell were outlined and with more time, the fuel system should fulfill its purposeof allowing testing and research of compression ignited fuel to be possible in the test cell.
Kontentan för denna mastersavhandling är utvecklingsprocessen för ett högtrycksbränslesystemför kompressionsbränslen såsom diesel och diesellika bränslen som kommer att installeras i enencylindertestcell hos AVL MTC Södertälje, Sverige. Testcellen används av AVL för forskningoch testning av nya bränslen åt deras kunder och detta nya bränslesystem kommer att utöka typernaav bränslen som kan testas med utrustningen till att inkludera kompressionsantända bränslen.Denna avhandling fokuserar på utvecklingen av tillförseln och trycksättnigen av bränslet, säkerställnigenav att ingående material är icke-korrosiva i den avsedda miljön och kompatibla med allanödvändiga bränsletyper och slutligen en säkerhetsanalys av systemet med avseende på operatörsochprocessäkerhet. Andra aspekter såsom massflödesmätning och bränslekonditionering presenterasi systeravhandlingen Flödesmätning och konditionering av högtryckantända bränslen för encylindertestcellskriven av C. Aksoy [1].Målet med denna avhandling var att leverera ett färdigtillverkad bränslesystem och om tiden tillät,även validera systemets prestanda och slutligen integrera och installera systemet i testcellen. Utvecklingsprocesseninleddes med att skriva en produktspecifikation som innehöll en sammanställningav kundens krav och önskemål för produkten och relaterade dessa till produktegenskaper med hjälpav en quality function deployment (QFD) matris. Detta dokument användes vidare som en bas förfortsatt utveckling av produkten i konceptgenereringsprocessen och för att väga de olika konceptenmot varandra med hjälp av Pugh’s matriser. De valda koncepten blev sedan analyserade ytterligare,ett flödesschema för de ingående komponenterna framtaget och övriga sekundära komponenteranalyserade och valda.Till slut valdes högtrycksbränslepumpen från Scanias XPI system och en tryckgivare från HP1000-serien från ESI. Inom tidsramen för avhandlingen färdigställdes aldrig projektet till den grad somhade planerats, men blev istället avbrutet innan tillverkningen av systemet han påbörjas på grund avtidsbegränsningar. Vissa sekundära komponentval, dokumentation såsom ritningar och färdigställningav den fysiska layouten av systemet kvarstod vid avhandlingens slut. All information angåendeallt nödvändigt fortsatt arbete för att färdigställa projektet och integrera systemet i encylindertestcellendokumenterades och med mer tid borde bränslesystemet kunna uppfylla sitt syfte att möjliggöratestning och forskning av kompressionsbränslen i testcellen.

APA, Harvard, Vancouver, ISO, and other styles

13

Venkatagiri, Chellappan Mirunalini. "Fuel cell based battery-less ups system." Texas A&M University, 2008. http://hdl.handle.net/1969.1/86026.

Full text

Abstract:

With the increased usage of electrical equipment for various applications, the demand for quality power apart from continuous power availability has increased and hence requires the development of appropriate power conditioning system. A major factor during development of these systems is the requirement that they remain environment-friendly. This cannot be realized using the conventional systems as they use batteries and/or engine generators. Among various viable technologies, fuel cells have emerged as one of the most promising sources for both portable and stationary applications. In this thesis, a new battery less UPS system configuration powered by fuel cell is discussed. The proposed topology utilizes a standard offline UPS module and the battery is replaced by a supercapacitor. The system operation is such that the supercapacitor bank is sized to support startup and load transients and steady state power is supplied by the fuel cell. Further, the fuel cell runs continuously to supply 10% power in steady state. In case of power outage, it is shown that the startup time for fuel cell is reduced and the supercapacitor bank supplies power till the fuel cell ramps up from supplying 10% load to 100% load. A detailed design example is presented for a 200W/350VA 1- phase UPS system to meet the requirements of a critical load. The equivalent circuit and hence the terminal behavior of the fuel cell and the supercapacitor are considered in the analysis and design of the system for a stable operation over a wide range. The steady state and transient state analysis were used for stability verification. Hence, from the tests such as step load changes and response time measurements, the non-linear model of supercapacitor was verified. Temperature rise and fuel consumption data were measured and the advantages of having a hybrid source (supercapacitor in parallel with fuel cell) over just a standalone fuel cell source were shown. Finally, the transfer times for the proposed UPS system and the battery based UPS system were measured and were found to be satisfactory. Overall, the proposed system was found to satisfy the required performance specifications.

APA, Harvard, Vancouver, ISO, and other styles

14

Oprea, Alexandra. "3D Fuel Tank Models for System Simulation." Thesis, KTH, Aerodynamik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-102084.

Full text

Abstract:

The purpose of the present master thesis is to optimize the current fuel tank simulations procedure for the next generation of JAS 39 Gripen ghters developed by SAAB AB. The current simulation process involves three dierent steps performed in three dierent computer environments. While the procedure works reasonably well on the fuel tank models of the previous version of the aircraft, it is too slow for the new Gripen tank models and their high level of detail. An optimized version of the procedure is put forward, which allows for tank analysis and fuel system simulation within reasonable time frames. Suggestions are made for future improvements.

APA, Harvard, Vancouver, ISO, and other styles

15

Wang, Xiaoyang. "Aircraft fuel system prognostics and health management." Thesis, Cranfield University, 2012. http://dspace.lib.cranfield.ac.uk/handle/1826/7214.

Full text

Abstract:

This thesis contains the specific description of Group Design Project (GDP) and Individual Research Project (IRP) that are undertaken by the author and form part of the degree of Master of Science. The target of GDP is to develop a novel and unique commercial flying wing aircraft titled FW-11. FW-11 is a three-year collaborative civil aircraft project between Aviation Industry Corporation of China (AVIC) and Cranfield University. According to the market analysis result conducted by the author, 250 seats capacity and 7500 nautical miles were chosen as the design targets. The IRP is the further study of GDP, which is to enhance the competitive capability by deploying prognostics and health management (PHM) technology to the fuel system of FW-11. As a novel and brand-new technology, PHM enables the real-time transformation of system status data into alert and maintenance information during all ground or flight operating phases to improve the aircraft reliability and operating costs. Aircraft fuel system has a great impact on flight safety. Therefore, the development of fuel system PHM concept is necessary. This thesis began with an investigation of PHM, then a safety and reliability analysis of fuel system was conducted by using FHA, FMEA and FTA. According to these analyses, fuel temperature diagnosis and prognosis were chosen as a case study to improve the reliability and safety of FW-11. The PHM architecture of fuel temperature had been established. A fuel temperature prediction model was also introduced in this thesis.

APA, Harvard, Vancouver, ISO, and other styles

16

Kivisaari, Timo. "System Studies of Fuel Cell Power Plants." Doctoral thesis, KTH, Chemical Engineering and Technology, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3226.

Full text

Abstract:

This thesis concerns system studies of power plants wheredifferent types of fuel cells accomplish most of the energyconversion.

Ever since William Grove observed the fuel cell effect inthe late 1830s fuel cells have been the subject or more or lessintense research and development. Especially in the USA theseactivities intensified during the second part of the 1950s,resulting in the development of the fuel cells used in theApollo-program. Swedish fuel cell activities started in themid-1960s, when ASEA (now ABB) ran a fuel cell projectdeveloping fuel cells to power submarines.

When the then project manager, Olle Lindström, wasappointed professor of Chemical Technology at KTH, the fuelcell activities at KTH were initiated, these activities havesince then been pursued at varying levels of intensity.

The fuel cell development experienced a recession during thelatter part of the 1970s and early 1980s, only to bere-vitalised during the 1990s as the full potential of theadvantages of environmental benefits and efficiency wereidentified.

System studies and process simulation utilising differentcomputer software programs may be used to study the behaviourand characteristics of fuel cells and their supportsystems.

Paper I describes the characteristics of a naturalgas-fuelled fuel cell power plant using alkaline fuel cells,both regarding efficiency and economics.

In paper II, a benchmark study of three different types ofsimulation software is presented. Theintention was to clarifyhow the selection of software might influence the resultsobtained, and some of the associated possible pitfalls.

Paper III presents a study of a fuel cell power plant wherethe primary source of energy is biomass (wood chips), which viahigh-pressure gasification and subsequent gas cleaning is madeavailable for conversion into electricity and heat by moltencarbonate fuel cells.

The last paper, paper IV, presents a s system study of ahigh-temperature fuel cell system, where the primary fuel iscoal, which through gasification is converted into a gaseousform. This study was a vital part of an EU-project studying thetechnical and economical feasibility of such systems.

Keywords: fuel cells, fuel cell systems, system studies,process simulation, system analysis, alkaline fuel cells,high-temperature fuel cells.

APA, Harvard, Vancouver, ISO, and other styles

17

Wongkhorsub, Chonlakarn. "Hybrid fuel cell/ejector heat pump system." Thesis, University of Nottingham, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.422752.

Full text

APA, Harvard, Vancouver, ISO, and other styles

18

Lillington, Richard. "Fuel system characterization : an investigation into the effects associated with the manufacturing and testing of precision fuel system components." Thesis, University of Warwick, 2013. http://wrap.warwick.ac.uk/58445/.

Full text

Abstract:

Every sub-component of a diesel injector must perform optimally to ensure maximum fuel economy and minimum particulate and carbon-dioxide emissions. Continually developing emissions standards will drive manufacturers to guarantee fuel system performance for a significant period of the unit lifetime. Key to implementing such systems will be the ability to compensate for unit changes in use. This thesis investigates possibilities for developing existing unit and sub-component characterization techniques to enable robust performance over an extended duration. An overview of existing injector characterization techniques is given, along with possibilities for enhancement of the existing state of the art through development of measurement systems widely used within the industry. Particular attention is paid to developing methods to allow testing of injectors and sub-components under representative conditions, where system pressures of 3000 bar are commonplace. Consideration is given to the benefits of moving from existing methods, based on steady-state testing, towards dynamic transfer function testing, and methods reliant on real-time sub-system feedback, to enable better characterization of the unit in use. Key to the development of enhanced characterization will be feedback from the electrohydraulic valves operating inside the injector. These valves are critical to current heavyduty injector designs. To enable full understanding of the unit’s operation, the thesis develops mathematical representations of such component’s functionality. Software models of these systems are offered, and various model simulations discussed. Possibilities for refining these are also provided. Within this thesis the available mechanisms for taking valve position feedback measurements capable of detecting valve lifts of <30 μm with suitable resolution and accuracy are discussed. The results of experiments with various sensing devices are then presented. Subsequently, novel methods for taking measurements using the unit stator as a sensing element are developed, described in terms of mathematical models, and tested in software simulations. Sensing experiments using valve hardware are then described. The thesis closes with a discussion on important future trends in fuel system development.

APA, Harvard, Vancouver, ISO, and other styles

19

Neerkaje, Abhijith. "Strategies for the introduction of alternative fuel vehicles in India." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/90697.

Full text

Abstract:

Thesis: S.M. in Engineering and Management, Massachusetts Institute of Technology, Engineering Systems Division, System Design and Management Program, 2013.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 42-46).
Rapid growth in population and increase in disposable income has led to a robust increase in automotive sales in India. As in many parts of the world, the internal combustion engines are the dominant vehicle power train in India. This has led to increase in tailpipe emissions in congested cities as well as increased consumption of crude oil. India needs to devise effective strategies to introduce fuel efficient nonpolluting Alternative Fuel Vehicles (AFV) to reduce GHG emissions and reduce oil consumption. In 2013, the Government of India unveiled a National Electric Mobility Mission Plan to promote AFV sales in India in a coordinated manner. Many similar, well-intentioned programs have been tried in the past. However, the creation of sustainable AFV markets has remained a challenge. This work presents the development of a multiplatform system dynamics model that helps one explore the dynamics of adoption of AFVs in Indian context. Using the model we explore three unique policy scenarios where the adoption of AFVs is studied. We show that the successful AFV adoption is dependent not just on providing demand side incentives, but also on promoting the creation of the refueling infrastructure. Results also show that Plug in Hybrid Electric Vehicle has the potential to be the dominant alternative fuel vehicle platform in India provided effective policies are in place.
by Abhijith Neerkaje.
S.M. in Engineering and Management

APA, Harvard, Vancouver, ISO, and other styles

20

Xie, Tieling. "Electrochemical corrosion effects of ethanol based fuel on general aviation aircraft fuel system components." Diss., Mississippi State : Mississippi State University, 2004. http://library.msstate.edu/etd/show.asp?etd=etd-11072004-122317.

Full text

APA, Harvard, Vancouver, ISO, and other styles

21

Norouzi, Shahrouz. "Interaction of diesel type fuels and engine fuel system components in compression ignition engines." Thesis, University of Birmingham, 2014. http://etheses.bham.ac.uk//id/eprint/5369/.

Full text

Abstract:

Contact of fuels with engine components at low and elevated temperatures for various amounts of time is found to be challenging as this contact has several effects on engine fuel system components and fuels. Also, storage of fuels for a long period of time is found to have almost the same effect on both engine components and fuels upon engine use. In this thesis fuel and engine components’ contact have been studied for four typical metals used in the construction of many engine fuel systems; in form of pure or alloys (copper, aluminium, mild carbon steel and stainless steel), studied after contact with three of the currently available fuels for use in compression ignition engines. Ultra-low sulphur diesel fuel (ULSD) was used as the fossil fuel, rapeseed methyl ester (RME) as the first generation biofuel and finally gas-to-liquid (GTL) as the second generation of biofuel, obtained via the Fischer-Tropsch process. The investigation was performed in different sections: fuels and metals have been studied for any degradation after contact at low and high temperatures for short and long exposure times, and an understanding of the corrosion process and any degradation on both metals and fuels has been achieved; due to the high hygroscopic character of these fuels and the presence of possible impurities in the fuel, the investigation was extended for analysis of the effect of the presence or absence of absorbed water and dissolved air (in the form of Oxygen) in fuels on degradation and corrosion characteristics of these fuels.

APA, Harvard, Vancouver, ISO, and other styles

22

Azolibe, Ifeanyi. "Architecture of a cyber-physical system for aircraft fuel control systems tests." Thesis, University of Glasgow, 2016. http://theses.gla.ac.uk/8503/.

Full text

Abstract:

The aircraft fuel control system makes sure an engine has the precise amount of fuel required to generate power and thrust for every stage of flight. It therefore plays a role in determining the economics of flight. In order to maintain the economic equilibrium of performance and flight safety, it undergoes a Maintenance Repair or Overhaul (MRO) service after several hours of operation. A critical aspect of the MRO service is the test performed to validate the airworthiness of a fuel control system before it returns to service. The test of aircraft fuel control systems is human-centric by design. The operator uses a network of test systems to generate in-flight conditions similar to what the Unit-Under-Test (UUT) experiences on-board an aircraft engine, then performs tests to validate and verify its airworthiness. Thereafter, test results are recorded for regulatory compliance reasons after each test is performed successfully. An analysis of the test specification for the UUT involved in this study revealed 90% of an operator’s touch-time is automatable. The functions of control, data processing, data entry and supervision must be achieved automatically if they are to be performed autonomously by a cyber-physical test system. But the automation of these activities at the micro level does not guarantee their autonomous execution at a macro level by such a cyber-physical system composed of the network of test systems. Therefore, knowledge of a multidisciplinary array of fundamental concepts and how they can be fused to execute the test of aircraft fuel control systems autonomously, have been developed as presented in this thesis. For the function of process control, the response of the processes used to set test conditions is ~ 50Hz, five times the rate of process responses reported in typical process industries where automation of process control have been achieved. As a result of this fundamental knowledge, the design of the architectures for the functions of control and data processing is an asynchronous one. Noting that none of the data is fed back through a network like the case of Networked Control Systems or Supervisory Control and Data Acquisition Systems. The realization of the control functions for each process used to set test conditions is based on control laws synthesized through modelling of their respective actuation mechanisms. Of the three models developed, a 2nd order model has been identified as been representative of the dynamic and steady-state characteristics of each actuation mechanism. A typical actuation mechanism contains a high number of masses and springs whose physical modelling resulted in a model of 12th order. This model is highly unrepresentative of the transient and steady-state response observed in the process due to difficulty in estimating the internal parameters of respective actuators. A linear model synthesized from the calibration data of each actuation mechanism has also been investigated and found to be too ideal. Its response is unrepresentative of the dynamic characteristics of the actuation mechanisms. The processes used to generate test conditions have been set simultaneously using a network of PID controllers. The controllers’ gains are an order of ten less than what they were for the sequential set up of test conditions due the fact that there are interactions between the processes inside a UUT. Fundamentally however, this Thesis demonstrates an asynchronous architecture for the control function, which enables a pseudo steady-state execution of tests. In-practice, this has the potential to reduce the time it takes to perform a test by one-third. The function of supervision has been developed in the form of a Fault Detection Isolation and Recovery capability within the cyber-physical test system. The architecture for this function is designed based on minimalizing the constraint of the period of recoverability (PoR), where the deviations from normal operation need to be detected, the outcomes they could result to—diagnosed and recovery strategies executed to prevent test systems or the UUT deviate from normal operation, using measurements acquired in a time < PoR. Oscillations and offsets have been identified as the major causes of deviations in subsystems during the test of the aircraft fuel control system in this study. In order to diagnose a deviation, a fuzzy inference engine has been developed over a Fault Tree Analysis approach because it makes the automation of domain knowledge needed to realize the supervision function effective. Nevertheless, the contributions of this thesis are the knowledge gaps it uncovers and the formalized approaches it proposes in the form of architectures to plug these gaps. It provides a direction on how to actualize not only the concept of automation, but the realization of a cyber-physical system to test an aircraft fuel control systems. It is the architecture of a singular system capable of executing the functions performed by an operator autonomously, and surpassing what can be achieved in the case of simultaneous process control, automated detection and isolation of a critical deviations under the period of recoverability, that is the fundamental contribution of this thesis. So that in the not so distant future the test of aircraft fuel control systems can be performed by machines.

APA, Harvard, Vancouver, ISO, and other styles

23

Trueblood, Christopher P. Halpin S. Mark. "Modeling a fuel cell system fo residential dwellings." Auburn, Ala., 2006. http://repo.lib.auburn.edu/2006%20Spring/master's/TRUEBLOOD_CHRISTOPHER_30.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

24

Dickinson, Angus John. "Development of a direct methanol fuel cell system." Thesis, University of Newcastle Upon Tyne, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.324802.

Full text

APA, Harvard, Vancouver, ISO, and other styles

25

Crescenzo, Domenico. "Pressure measurement in the high pressure fuel system." Thesis, KTH, Förbränningsmotorteknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-267549.

Full text

Abstract:

In order to meet the demanding legislations on diesel engines exhaust emissions, an always more accurate control over the amount of fuel injected in the cylinders is required. A comprehensive understanding of the main factors involved in the injection process, therefore, should be achieved. Such factors are the pressure in the common rail, the injection ontime and the temperature at the injector. The rail pressure, in particular, has been the focus of this project: Its accurate acquisition is crucial for the correct determination of the injection duration and, consequently, for an improved control over the amount of fuel injected. The rail pressure, however, is characterized by significant instabilities affecting the measurement. An experimental campaign has been conducted on a Scania D13 engine in order to characterize and understand the rail pressure signature during engine steady operations: The superposition of injections, pump strokes and water-hammer instabilities forms a complex pattern extensively discussed. An attempt to model the pressure fast transients has been made: While the frequency content of the phenomenon investigated is correctly interpreted, the results obtained in the time domain diverge significantly in amplitude and phase from the experimental data collected. Finally, the measurement strategy adopted today at Scania CV AB to acquire the rail pressure has been investigated and its accuracy assessed. On the basis of the knowledge achieved, a new adaptive measurement technique, capable of changing the estimation process accordingly to the engine operating condition detected, is proposed. The potentiality of an increased accuracy in controlling the amount of fuel injected is proved for engine steady operations. Further investigation regarding the method tolerance to engine transients, however, is required.

APA, Harvard, Vancouver, ISO, and other styles

26

Aksoy, Can Aksoy. "Fuel consumption measurements and fuelconditioning in high-pressure fuel systemfor single cylinder test cell." Thesis, Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-75439.

Full text

Abstract:

This master thesis is part of a bigger project issued by AVL with the purpose to design a high pressure compression ignition fuel system for their single cylinder test cell at their facility in Södertälje. Typically compression-ignition fuel tests are being run within an operating pressure range of 500-2400 bar, but this system has to be able to run with pressures up to 3500 bar. The project was intended to be carried out by two participants where this master thesis covers the evaluation of how fuel consumption rates shall be measured in the system described above as well as how the fuel shall be conditioned. The selected concept for measuring fuel consumption rate was based on measuring the mass flow on the low-pressure side of the system with a Coriolis flowmeter. The chosen temperature sensor for monitoring the temperature on the high-pressure side was a K-type thermocouple which would be directly connected to the fuel rail in the system. A bleeder was selected on the basis that it had been used in one of AVL's old test cells. A heat exchanger could not be chosen. However a rough estimation of the capacity needed for a heat exchanger was calculated for future reference. The methodology used to develop a concept was based on the engineering project process taught to students at Karlstad University. First a project plan was made followed by a solution-independently expressed product specification including a specification of requirements and QFD-matrix. Several concepts were generated for measuring the fuel consumption by evaluating different measuring principles, available components, possible positions of the components within the system and combinations with different fuel supply concepts. Less extensive methods were used for the remaining tasks in the detailed engineering phase of the project. The concepts were compared using Pugh's analysis and a concept was selected in collaboration with AVL. The majority of the objectives for this master thesis could be successfully carried out. The documentation and drawings requested by the client, manufacturing of the system, implementation and validation into the test cell could not be done due to lack of time. This, along with the selection of a heat exchanger and low-pressure thermocouple was left for future work.

APA, Harvard, Vancouver, ISO, and other styles

27

Wang, Xiaoyang. "The impact of fuel ethanol on motor gasoline market modeling through a system of structural equations /." Diss., Columbia, Mo. : University of Missouri-Columbia, 2008. http://hdl.handle.net/10355/5698.

Full text

Abstract:

Thesis (M.S.)--University of Missouri-Columbia, 2008.
The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on August 17, 2009) Includes bibliographical references.

APA, Harvard, Vancouver, ISO, and other styles

28

Merling, Weston Lee. "Assessing the Compatibility of Alternative Jet Propulsion and Diesel Fuels with Selected Fuel System Elastomers." University of Dayton / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1343399395.

Full text

APA, Harvard, Vancouver, ISO, and other styles

29

Shevock, Bryan Wesley. "System Level Modeling of Thermal Transients in PEMFC Systems." Thesis, Virginia Tech, 2007. http://hdl.handle.net/10919/31079.

Full text

Abstract:

Fuel cell system models are key tools for automotive fuel cell system engineers to properly size components to meet design parameters without compromising efficiency by over-sizing parasitic components. A transient fuel cell system level model is being developed that includes a simplified transient thermal and parasitics model. Model validation is achieved using a small 1.2 kW fuel cell system, due to its availability. While this is a relatively small stack compared to a full size automotive stack, the power, general thermal behavior, and compressor parasitics portions of the model can be scaled to any number of cells with any size membrane area. With flexibility in membrane size and cell numbers, this model can be easily scaled to match full automotive stacks of any size. The electrical model employs a generalized polarization curve to approximate system performance and efficiency parameters needed for the other components of the model. General parameters of a stackâ s individual cells must be known to scale the stack model. These parameters are usually known by the time system level design begins. The thermal model relies on a lumped capacity approximation of an individual cell system with convective cooling. From the thermal parameters calculated by the model, a designer can effectively size thermal components to remove stack thermal loads. The transient thermal model was found to match experimental data well. The steady state and transient sections of the curve have good agreement during warm up and cool down cycles. In all, the model provides a useful tool for system level engineers in the early stages of stack system development. The flexibility of this model will be critical for providing engineers with the ability to look at possible solutions for their fuel cell power requirements.
Master of Science

APA, Harvard, Vancouver, ISO, and other styles

30

Trømborg, Håkon. "Control system for the DNV GL Fuel Fighter Prototype and the DNV GL Fuel Fighter UrbanConcept." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for teknisk kybernetikk, 2014. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-25969.

Full text

Abstract:

In this report I present my work developing the main control unit in the two DNV GL Fuel Fighter cars that raced in Shell Eco-marathon 2014. The objective of the Shell Eco-marathon is to race a set distance using as little energy as possible, and my focus has been on giving the driver the tools and information to run the car in an energy efficient manner. I explored different existing driving strategies, and because of the high power consumption of the motor controller circuit I decided to use the "Pulse and Glide" strategy. This meant the car would accelerate rapidly to maximum speed and then coast with motor and its controller switched off.

APA, Harvard, Vancouver, ISO, and other styles

31

Fallon, John E. "Naval Fuel Management System (NFMS) a decision support system for a limited resource." Thesis, Monterey, California. Naval Postgraduate School, 2010. http://hdl.handle.net/10945/5166.

Full text

Abstract:

Approved for public release; distribution is unlimited
Includes supplemental material, embedded in this pdf. See page 46 of document to read instructions for accessing supplemental material.
The fuel planning for U.S. Naval operations at sea is reactive and relies upon pen and paper calculations. Decisions on where and when to refuel are complex and need a Decision Support System (DSS) to help planners maximize the benefits of the limited fuel resource. This thesis defines requirements and outlines a feasible design to develop a Naval Fuel Management System (NFMS). The variables that fuel planning rely upon are not just ship course and speed, but also the weather at the time a ship travels through a particular area. The most efficient plant configuration plays a factor in the fuel plan as well. Additionally, there are numerous ports and oilers available at any given time. Up-to-date accurate weather forecast databases are available, predicting currents and winds, which will affect the ship in the future. Fuel burn charts have been developed for each ship class outlining the most efficient plant configuration for given speeds. Transportation analysis has shown that an optimal path exists for this class of complex problems. By combining these technologies into one system, an application can be developed to accurately plan fueling operations in the future, making Navy refueling more efficient.
US Navy (USN) author

APA, Harvard, Vancouver, ISO, and other styles

32

Bertini, Lorenzo. "Modeling and Optimization of a Fuel Cell Hybrid System." Thesis, KTH, Skolan för kemivetenskap (CHE), 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-51143.

Full text

Abstract:

The purpose of this project was the modeling, optimization and prediction of a hybrid system composed of a fuel cell, a dc-dc converter and a supercapacitor in series. Lab tests were performed for each device to understand their behavior, and then each one was modeled using software (Simulink). The validation of the model was done by comparing its results with measured data; finally the model was used for the optimization and the prediction of the hybrid system

APA, Harvard, Vancouver, ISO, and other styles

33

Hallvig, Richard. "Fuel Consumption Tuning for Electric All Wheel Drive System." Thesis, Uppsala universitet, Signaler och System, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-197509.

Full text

Abstract:

This report investigates methods to reduce fuel consumption in SAAB's prototype hybrid car. It is primarily concerned with changes in the final drive ratio (FDR) of the gearbox. Reducing the FDR lowers the engine speed, allowing the engine to run at a more efficient operating point. However, this has a negative impact on engine power and vehicle performance. It was thought that the hybrid's eXWD (electric cross wheel drive) system could make up for this loss of performance. Computer simulations showed significant improvements in fuel economy when the FDR was reduced. This was confirmed by real world tests on a chassis dynamometer, although the number of tests were too low to establish the precise fuel consumption reduction. The effects on performance were evaluated by creating a quasi static model of the drivetrain and calculating which combinations of speed and acceleration corresponded to the engine's torque limits. The loss of acceleration was found to be lower than the increase in acceleration made possible by eXWD for most choices of FDR. It is therefore possible to reduce the FDR in the hybrid version of the car and still maintain a performance advantage compared to the front wheel drive version. No other major disadvantageous effects were found. The conclusion was therefore that a reduction of the final drive ratio is a feasible method to improve the fuel economy of the prototype car, given that maximizing performance is deemed less important than increasing fuel economy.

APA, Harvard, Vancouver, ISO, and other styles

34

Pettersson, Eric. "Modelling of high-pressure fuel system for controller development." Thesis, Uppsala universitet, Avdelningen för beräkningsvetenskap, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-386130.

Full text

Abstract:

This master thesis treats the modelling of a common-rail direct fuel injection system where pressure generation is decoupled from the injection process. It has been shown that the fuel pressure plays a vital role for the general performance of the engine, affecting both emissions and efficiency, and it is carefully regulated to achieve optimal performance at different operating points. In an attempt to facilitate the development of the responsible control algorithms, a simulation framework has been requested. A model describing the complete work cycle of the high-pressure fuel system is developed and implemented in a Simulink environment. It is to a large extent based on the underlying physics and constructed in a modular manner, which allows for different engine configurations to be simulated. The modelled pressure signal is compared to experimental data at different operating points with promising results in capturing the transient behaviour from a low-level perspective. Additionally, it manages to replicate some of the pressure oscillations which has been observed in the real system and it shows good response to changes in the input signals. However, there are some areas which are subject to improvement since capturing the static pressure levels over longer drive cycles has proved to be a difficult task. Overall, the developed model serves as a starting point for future development and validation of control algorithms.

APA, Harvard, Vancouver, ISO, and other styles

35

Torres, Arevalo Arturo Alejandro, and Changhao Han. "Air conditioning system modeling for car fuel economy simulation." Thesis, KTH, Energiteknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-246125.

Full text

Abstract:

The automotive air conditioning system is the greatest auxiliary load of a vehicle, having a considerable impact on its fuel consumption and CO2 emissions. For this reason, forecasting the influence that this sys-tem has on the fuel economy of a car is desired. The present work is dedicated to model the air conditioning system of a plug-in hybrid ve-hicle in order to predict its energy consumption. GT-SUITE was chosen as the simulation tool, where the air condi-tioner, which is a vapor-compression refrigeration system, was mod-eled by specifying its components: compressor, evaporator, thermal expansion valve and condenser. Moreover, additional sub-systems which influence the energy consumption were also considered, these are the vehicle’s cabin and the battery cooling loop. The simulated model shows good agreement with test data for impor-tant parameters such as the compressor power consumption and the air temperature after the evaporator. The percent difference between the test data and the simulation for the auxiliary power consumption (energy consumed by the A/C compressor and the charging load of the low voltage battery) is 6.25%.
På ett fordon utgör luftkonditioneringssystem den främsta extraordi-nära energibelastningen, vilket har stor påverkan på bränsleförbruk-ning och koldioxidutsläpp. Av detta skäl är det önskvärt att förutse det inflytande som detta system har på fordonets bränsleekonomi. Detta arbete är har för avsikt att simulera luftkonditioneringssystemet för ett plug-in hybridfordon för att förutsäga energiförbrukningen. GT-SUITE valdes som simuleringsverktyg, där klimatanläggningen, som är ett ångkomprimerat kylsystem, modellerades genom att speci-ficera komponenterna: kompressor, förångare, värmeutvidgningsven-til och kondensor. Dessutom beaktades ytterligare delsystem som på-verkar energiåtgången, nämligen fordonets hytt och batterikylnings-loop. Den simulerade modellen visar en god korrelation med testdata för be-tydelsefulla parametrar såsom kompressorns energiförbrukning och lufttemperaturen efter förångarsteget. Den procentuella skillnaden mel-lan testdata och simuleringen för den extra energiförbrukningen (ener-gi som förbrukas av A/C-kompressorn och laddningen av lågspän-ningsbatteriet) är 6,25%.

APA, Harvard, Vancouver, ISO, and other styles

36

Vick, Andrew W. "Genetic Fuzzy Controller for a Gas Turbine Fuel System." University of Cincinnati / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1291053513.

Full text

APA, Harvard, Vancouver, ISO, and other styles

37

Blackert, Erik. "Total Cost of Ownership For a Marine Fuel System." Thesis, KTH, Marina system, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-290162.

Full text

Abstract:

The modern marine fuel system have a vital part in preparing the fuel before it can enter theengines. Hard particles and water are removed and the viscosity needs to meet limitationsof the engines, to prevent damage. The cost for operating the fuel system and wear on theengine varies depending on how the fuel system are operated and on surrounding parameters.This thesis explains the cost impact of di erent parameters on the total cost for operating afuel system and aims to create a total cost of ownership model that also considers the costsfor systems connected to the fuel system.The total cost of ownership model includes capital expenses for the equipment and the operationalexpenses in form of; energy, service, sludge storage, water production, risk and alsoincreased costs on connected systems.The result of this total cost of ownership research shows that even if there are an increasedcost for operating the fuel system itself for highest performance will the total cost of ownershipwhen considering connected systems be lower. The user are therefore always recommendedto aim for maximum separation of hard particles to decrease the cost for enginewear and to lower the total cost of risk for a breakdown. The total energy consumption forthe fuel system can be decreased by up to 15% when variable ow control are used on thesupply pumps and meanwhile increase the separation eciency.
Det moderna bränslesystemet har en viktig roll i att förbereda bränslet innan det kan förbrännas i fartygets motorer. Hårda partiklar och vatten avlägsnas, viskositeten måste också hållas inom motorernas tillåtna gränser för att motverka slitage. Användare kostnaden för ett bränslesystem varier beroende på hur det används samt av vissa utomståendeparametrar. Den här analysen av totala ägandekostnaden är gjord för att kunna kopplakostnader på kringliggande system ombord med hur bränslesystemet används. Den totala ägandekostnadsmodellen innehåller inköpskostnader för bränslesystemet samt användare kostnaden i form av; energi, service, slamförvaring, vattentillverkning, kostnaden för risk och kostnaden på kringliggande system ombord. Resultatet av analysen är att ökade driftkostnader för bränslesystemet kan motiveras i form av att kostnaden för kringliggande system sjunker när bränslesystemet fungerar optimalt. Användaren kan därför rekommenderas att alltid sträva efter att få ut den fulla potentialen för bränslesystemet för att spara in på kostnader så som motorslitage och risk för motorhaveri. Den totala energiförbrukningen för bränslesystemet kan förväntas sjunka med 15% om pumpar med variabelt öde används till separatorerna samtidigt som separeringseffektiviteten ökar

APA, Harvard, Vancouver, ISO, and other styles

38

Axelsson, Tobias. "Diagnosis System Conceptual Design Utilizing Structural Methods : Applied on a UAV’s Fuel System." Thesis, Linköping University, Department of Electrical Engineering, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-2498.

Full text

Abstract:

To simplify troubleshooting and reliability of a process, a diagnosis system can supervise the process and alarm if any faults are detected. A diagnosis system can also identify one, or several faults, i.e. isolate faults, that may have caused the alarm. If model-based diagnosis is used, tests based on observations from the process are compared to a model of the process to diagnose the process. It can be a hard task to find which tests to be used for maximal fault detection and fault isolation. Structural Methods require not very detailed knowledge of the process to be diagnosed and can be used to find such tests early in the design of new processes. Sensors are used to get observations of a process. Therefore, sensors placed on different positions in the process gives different possibilities for observations. A specific set of sensors are in this work called a sensor configuration.

This thesis contributes with a method to predict and examine the fault detection and fault isolation possibility. By using these two diagnosis properties, a suitable sensor configuration is computed and tests to be used in a future diagnosis system are suggested. For this task an algorithm which can be used in the design phase of diagnosis systems, and a Matlab implementation of this algorithm are described.

In one part of this work the Matlab implementation and the algorithm are used to study how a model-based diagnosis-system can be used to supervise the fuel system in an Unmanned Aerial Vehicle (UAV).

APA, Harvard, Vancouver, ISO, and other styles

39

Nolan, John. "Modeling and control of an automotive fuel cell thermal system /." Online version of thesis, 2009. http://hdl.handle.net/1850/10651.

Full text

APA, Harvard, Vancouver, ISO, and other styles

40

Gransten, Johan. "Linear and Nonlinear Identification of Solid Fuel Furnace." Thesis, Linköping University, Department of Electrical Engineering, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-5182.

Full text

Abstract:

The aim of this thesis is to develop the knowledge about nonlinear and/or adaptive solid fuel boiler control at Vattenfall Utveckling AB. The aim is also to make a study of implemented and published control strategies.

A solid fuel boiler is a large-scale heat (and power) generating plant. The Idbäcken boiler studied in this work, is a one hundred MW furnace mainly fired with wood chips. The control system consists of several linear PID controllers working together, and the furnace is a nonlinear system. That, and the fact that the fuel-flow is not monitored, are the main reasons for the control problems. The system fluctuates periodically and the CO outlets sometimes rise high above the permitted level.

There is little work done in the area of advanced boiler control, but some interesting approaches are described in scientific articles. MPC (Model Predictive Control), nonlinear system identification using ANN (Artificial Neural Network), fuzzy logic, Hµ loop shaping and MIMO (Multiple Input Multiple Output) PID tuning methods have been tested with good results.

Both linear and nonlinear system identification is performed in the thesis. The linear models are able to explain about forty percent of the system behavior and the nonlinear models explain about sixty to eighty percent. The main result is that nonlinear models improve the performance and that there are considerable disturbances complicating the identification. Another identification issue was the feedback during the data collection.

APA, Harvard, Vancouver, ISO, and other styles

41

Tiwari, Shishir. "Improving understanding of alternative fuel vehicle market dynamics using interactive simulations." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/107358.

Full text

Abstract:

Thesis: S.M. in Engineering and Management, Massachusetts Institute of Technology, School of Engineering, System Design and Management Program, Engineering and Management Program, 2016.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 67-70).
Interactive management flight simulators are becoming increasingly common as a tool for teaching key concepts in management and related fields. Advocates of flight simulators suggest that the active engagement of students with experimentation and game play may even lead to enhanced systems thinking capabilities. Through this thesis, I undertake an experiment to test this proposition, recruiting respondents from Amazon's Mechanical Turk online workforce. Using a three-group pretest-post-test design, I randomly assign respondents to complete one of the following: a) Read a report describing the results of the simulator, including actual screenshots from the simulator, to convey the same information about the AFV market in a conventional style (the control group). b) Undertake tasks using an interactive management flight simulator about the diffusion of alternative fuel vehicles given instructions but no results (treatment one) and c) Undertake the same tasks using an interactive management flight simulator about the diffusion of alternative fuel vehicles, with the aid of the report that also explains the results expected (treatment two). The simulator was built on several key concepts of system dynamics applied to alternative fuel vehicle market: the concept of consumer acceptance, platform utility, stocks and flows and the effects of time delays in a system's behavior. The results of this experiment demonstrate that the groups which used simulator (treatment 1 and 2) developed at least similar and in some cases, better understanding of the AFV market dynamics. I conclude that simulators can be an effective way to teach complex system dynamics principles and socio-technical interactions.
by Shishir Tiwari.
S.M. in Engineering and Management

APA, Harvard, Vancouver, ISO, and other styles

42

Arumugam, Gnana Shekaran. "ALTERNATE MODELS FOR NATURAL GAS TRANSPORTATION SYSTEM PERFORMANCE OPTIMIZATION." UKnowledge, 2015. http://uknowledge.uky.edu/ms_etds/7.

Full text

Abstract:

The Natural Gas market in the U.S is growing rapidly with evidence that the nation has enough shale reserves to power the country for the next century. To ensure continued economic benefits through the use of this environmentally desired energy source, it becomes important to optimize the transportation network system design. Transportation through pipelines is one of the most common methods used to distribute Natural Gas from source to destination. This transportation system, consisting of pipelines, compressors and other supporting equipment, must be optimized, considering all relevant parameters to minimize cost and increase profit. The research presented here improves on the fuel cost minimization models in literature to incorporate pipeline elevation and safety requirements. A new model is proposed to consider the entire transportation network as a single system and optimize it considering all relevant parameters. The optimization model is setup as a mixed integer nonlinear program. The proposed model is used to optimize the pipeline network for a case study, evaluate the model as well as investigate design capacity and installed capacity of pipeline network.

APA, Harvard, Vancouver, ISO, and other styles

43

Bessette, Norman F. II. "Modeling and simulation for solid oxide fuel cell power system." Diss., Georgia Institute of Technology, 1994. http://hdl.handle.net/1853/17824.

Full text

APA, Harvard, Vancouver, ISO, and other styles

44

Slippey, Andrew J. "Dynamic modeling and analysis of multiple SOFC system configurations /." Online version of thesis, 2009. http://hdl.handle.net/1850/10834.

Full text

APA, Harvard, Vancouver, ISO, and other styles

45

Oheda, Hakim. "Artificial neural network control strategies for fuel cell hybrid system." Thesis, Cranfield University, 2013. http://dspace.lib.cranfield.ac.uk/handle/1826/7964.

Full text

Abstract:

The greening of air transport is the driver for developing technologies to reduce the environmental impact of aviation with the aim of halving the amount of carbon dioxide (COଶ) emitted by air transport, cutting specific emissions of nitrogen oxides (NO୶) by 80% and halving perceived noise by the year 2020. Fuel Cells (FC) play an important role in the new power generation field as inherently clean, efficient and reliable source of power especially when comparing with the traditional fossil-fuel based technologies. The project investigates the feasibility of using an electric hybrid system consisting of a fuel cell and battery to power a small model aircraft (PiperCub J3). In order to meet the desired power requirements at different phases of flight efficiently, a simulation model of the complete system was first developed, consisting of a Proton Exchange Membrane hybrid fuel cell system, 6DoF aircraft model and neural network based controller. The system was then integrated in one simulation environment to run in real-time and finally was also tested in hardware-in-the-loop with real-time control. The control strategy developed is based on a neural network model identification technique; specifically Model Reference Control (MRC), since neural network is well suited to nonlinear systems. To meet the power demands at different phases of flight, the controller controls the battery current and rate of charging/discharging. Three case studies were used to validate and assess the performance of the hybrid system: battery fully charged (high SOC), worst case scenario and taking into account the external factors such as wind speeds and wind direction. In addition, the performance of the Artificial Neural Network Controller was compared to that of a Fuzzy Logic controller. In all cases the fuel cell act as the main power source for the PiperCub J3 aircraft. The tests were carried-out in both simulation and hardware-in-the-loop.

APA, Harvard, Vancouver, ISO, and other styles

46

Lodge, Richard. "Experimental characterization of a 2.5 kW PEM fuel cell system." Connect to this title online, 2005. http://hdl.handle.net/1811/312.

Full text

Abstract:

Thesis (Honors)--Ohio State University, 2005.
Title from first page of PDF file. Document formattted into pages: contains 47 p.; also includes graphics. Includes bibliographical references (p. 47). Available online via Ohio State University's Knowledge Bank.

APA, Harvard, Vancouver, ISO, and other styles

47

DiFiore, Daniel C. "Sliding mode control applied to an underactuated fuel cell system /." Online version of thesis, 2009. http://hdl.handle.net/1850/9832.

Full text

APA, Harvard, Vancouver, ISO, and other styles

48

Huang, Chih-Hsien, and 黃智賢. "The Safety Driving Assistant System – Fuel Monitoring System." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/74824249844703074998.

Full text

Abstract:

碩士
明志科技大學
機電工程研究所
98
This thesis presents a fuel monitoring system which could estimate the driving range and could predict the driving periods of the vehicle with remaining fuel. The artificial neural network (ANN) technology was using for to estimate the driving range and engine running periods of the vehicle. There are three parameters, which are engine speed, vehicle speed and fuel volume, as inputs of the ANN. The range could be driving and the periods could be running of the engine are presented as outputs of the ANN. The experiment results are presented for to demonstrate the performance of the presented system.

APA, Harvard, Vancouver, ISO, and other styles

49

WENG, TING-CHING, and 翁頂清. "Optimal Control System Design for Fuel Processing System." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/04152012946279247192.

Full text

Abstract:

碩士
大葉大學
電機工程學系
96
This paper presents that an optimal control system which consists of both feedforward and state-feedback controllers is designed using a well-developed linear quadratic Gaussian and loop transfer recovery (LQG/LTR) method for a fuel processing system (FPS).This FPS uses natural gas as fuel and reacts with atmospheric air through a catalytic partial oxidation (CPO)，after pure supply to proton exchange membrane fuel cell (PEMFC) stack . The objectives of this paper are to use the Matlab/Simulink software tool to model such an optimal control system and to analyze the system performance. The proposed method achieves better performance and robustness properties in both time-domain and frequency-domain responses.

APA, Harvard, Vancouver, ISO, and other styles

50

Chang, Chun-Lung, and 章俊隆. "Fuel sensor-less control of a liquid feed fuel cell system." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/26647078348956909743.

Full text

Abstract:

博士
國立臺灣大學
工程科學及海洋工程學研究所
97
This thesis presents a series of novel fuel sensor-less control schemes for a liquid feed fuel cell system that operate under various loading conditions and are suitable for portable power sources. The proposed techniques utilize the operating characteristics of a fuel cell, such as temperature, voltage, current and power to control the supply of fuel and regulate its concentration. A current integral technique with two different approaches has been developed for calculating the fuel quantity required at each monitoring cycle, which can be applied with the concentration regulating process to control the fuel supply for stable operation. As verified by systematic experiments, these schemes can control effectively and stably the supply of fuel with greatly reduced response time even when the MEA deteriorates gradually. The primary features and advantages of fuel sensor-less control scheme are as follows. When the fuel concentration sensor is excluded, the cost of a liquid feed fuel cell system is decreased and system volume as well as weight is reduced, thereby increasing specific energy density and design simplicity, and shortening system response time. Notably, temperature-compensation for measurement data is unnecessary. With a decreased number of components, this technology improves durability and reliability of a liquid feed fuel cell. That will help commercialization of liquid feed fuel cells and thus more adapt to portable and automotive power units like camcorder, PDA, laptops, E-Bikes and handicap cars.

APA, Harvard, Vancouver, ISO, and other styles

Dissertations / Theses on the topic 'Fuel system'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles