Дисертації з теми "Cycle de Stirling"
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Ozbay, Sercan. "Thermal Analysis Of Stirling Cycle Regenerators." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613541/index.pdf.
Wills, James Alexander. "Exergy analysis of a Stirling cycle." Master's thesis, University of Cape Town, 2017. http://hdl.handle.net/11427/26865.
Liang, Hua. "Viability of stirling-based combined cycle distributed power generation." Ohio : Ohio University, 1998. http://www.ohiolink.edu/etd/view.cgi?ohiou1176484842.
Blaha, Josef. "Stirlingův motor." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-228037.
Hugh, Mark A. "The effects of regenerator porosity on the performance of a high capacity stirling cycle cryocooler." Ohio : Ohio University, 1993. http://www.ohiolink.edu/etd/view.cgi?ohiou1175707790.
Pfeiffer, Jens [Verfasser]. "Unsteady Analytical Model for Appendix Gap Losses in Stirling Cycle Machines / Jens Pfeiffer." München : Verlag Dr. Hut, 2016. http://d-nb.info/109781811X/34.
Marin, Andreea. "Optimizarea exergoeconimică a unei centrale solare termice." Thesis, Paris 10, 2014. http://www.theses.fr/2014PA100054.
In the current economic and energy context, implementation of technologies using renewable energy as heat source has two advantages: reducing pollution and fuel costs. There is a need to promote renewable energy sources such as significant sources of power generation for decentralized systems. In the first part, it was made a literature review on existing technologies for the production of electricity with solar energy. One of the objectives of this thesis was to build a Stirling engine gamma type suitable to use solar energy (flat plate collator). The Stirling engine was tested to compare the experimental results with the results of Schmidt model, realized in the software, Matlab. Another thermodynamic cycle was studied in this work, the Organic Rankine Cycle (ORC). A mathematical model was developed and verified in software, Thermoptim and EES (Engineering Equation Solver) with experimental results to study the installation performance function of different operating temperatures. The entire system and each subsystem are analyzed according to the first and the second law of thermodynamics. The exergy method and Pinch analysis are used to evaluate the performance of the system like irreversibility and exergy destruction, phenomenon that occurs in all components of the ORC system. This analysis is to improve the operation
Seres, Sandu. "Life cycle assessment of hybrid systems for rural electrification in Bolivia." Thesis, KTH, Skolan för kemi, bioteknologi och hälsa (CBH), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-299637.
Bolivia är ett utvecklingsland i Sydamerika där många landsbygdssamhällen fortfarande saknar tillgång till elektricitet. En anslutning till det nationella kraftsystemet är inte genomförbar på grund av de ekonomiska och topografiska svårigheterna samt miljöproblemen som kan uppstå. För att ta itu med problemet måste decentraliserade lösningar hittas. Solcellspaneler i kombination med batterier utgör ett möjligt alternativ för avlägsna områden som befinner sig nära ekvatorn och vid höga höjder. Ett sådant system behöver dock ytterligare en kontrollerad energikälla för att tillgodose efterfrågan på grund av den ojämna tillgången på solenergi. Det vanligaste alternativet är dieselgeneratorer. Men förbränning av fossila bränslen påverkar klimatet och mer miljövänliga lösningar undersöks. Stirlingmotorer som använder träpellets skulle kunna ersätta dieselgeneratorn i kampen för en bättre miljö. Syftet med denna studie är att undersöka och jämföra miljöpåverkan av två hybridsystem. Det ena systemet består av en dieselgenerator, PV-paneler och batterier medan det andra systemet består av en Stirlingmotor, PV-paneler och batterier. Det utvalda studieområdet är samhället El Carmen, Pando, i Bolivia. En livscykelanalys (LCA) utförs för de två systemen enligt LCA-metodiken. Först, utförs individuella LCA för vardera system för alla påverkanskategorier vid midpoint. Sedan utförs en jämförande LCA mellan de två systemen för alla påverkanskategorier både vid midpoint och endpoint. Slutligen, utförs en känslighetsanalys för att testa systemens robusthet. Den individuella analysen vid midpoint för båda systemen påvisade att den kontrollerade delen av elproduktion, det vill säga dieselgeneratorn och Stirlingmotorn, genererade den största miljöpåverkan i kategorierna Global uppvärmning, Uttunning av ozonskiktet, Joniserande strålning, Bildning av marknära ozon, Bildning av partiklar, Försurning, Cancerframkallande humantoxicitet, Landanvändning, Brist på fossila resurser och Vattenförbrukning. Alla processerna kopplade till PV-elproduktionen genererade en större miljöpåverkan i kategorierna Ecotoxicitet (mark, söt- och havsvatten), Övergödning (såväl söt- som havsvatten) och Icke cancerframkallande humantoxicitet. Resultaten vid midpoint för den jämförande LCA är inte övertygande. Vardera system fick högre poäng i vissa kategorier men lägre poäng i andra. Ingen tydlig slutsats kunde dras angående identifieringen av det mer miljövänliga alternativet. Diesel/PV/Batteri-systemet dominerar kategorierna Global uppvärmning, Bildning av marknära ozon, Bildning av partiklar, Försurning och Brist på fossila bränslen medan Stirling/PV/Batteri-systemet påvisade större miljöpåverkan i kategorierna Uttunning av ozonskiktet, Ekotoxicitet, Övergödning, Cancerframkallande humantoxicitet och Brist på mineraltillgångar. Skadebedömningen vid endpoint påvisade att de redovisade utsläppen och midpoint- katergorierna har en större påverkan på människors hälsa och resursbrist i Diesel/PV/Batteris fall. Däremot påvisade det Stirling/PV/Batteri-systemet en större påverkan på ekosystemet. Känslighetsanalysen utfördes i två scenarier. I det första scenariot ändrades avståndet för bränsletransport. Ingen signifikant skillnad påvisades i någon av de tre endpoint- kategorierna. I det andra scenariot, Diesel/Stirling insats, påvisades en ökande trend (~30% för första systemet och ~25% för det andra) i alla endpoint-kategorier med ökandet av insatsen från den kontrollade delen av elproduktion.
Diallo, Alpha Dassimou. "Contribution à la conception et à la réalisation d'une micro-machine thermique à cycle de Stirling." Thesis, Bourgogne Franche-Comté, 2019. http://www.theses.fr/2019UBFCD035.
In France, it is estimated that more than 27 TWh of heat at a temperature between 100 and 200°C is lost each year. The recovery of this lost heat is therefore an important issue in reducing overall energy consumption. Heat recovery can be done using Stirling machines, which are reversible thermodynamic machines that convert heat into mechanical motion, which could then be converted into electricity from two sufficiently different temperature sources. The recovery of the heat produced by electronic systems could be done with a miniaturized Stirling machine capable of producing electricity from any heat source. Such a micro-machine can also operate in "refrigerator" mode (transporting heat from a hot source to a cold source through mechanical work) and could be used to cool electronic components. The energy efficiency of Stirling machines can reach 38% (with a hot source at 200°C) and their maintenance is considered minimal. However, no Stirling machine has yet been demonstrated with a volume of less than one cubic centimeter. In 2015, a three-phase Stirling micromachine architecture that can be miniaturized using MEMS technologies has been proposed and successfully tested in macro-volume (with a size of about twenty centimeters). The present thesis work was devoted to the miniaturization of this new Stirling micromachine concept for heat recovery between 50 and 200°C, using MEMS technologies. This approach would allow the simultaneous fabrication of large quantities of micro-machines and thus the possible creation of micromachine networks at low cost per watt of electricity produced. The studied micromachines are made up of a stack of silicon and glass wafers. Their design challenges have been studied in detail and their expected mechanical output power has been estimated. The necessary manufacturing processes were developed and the characterization of each element was carried out prior to assembly. In particular, they include hybrid membranes 5 mm in diameter and 200 microns thick that act as micro-volume pistons and are key elements of the machine. These membranes are made up of silicon parts (spirals and discs) embedded in a flexible silicone elastomer membrane whose mechanical properties have therefore been studied in detail. Numerical simulations of the mechanical and dynamic behavior of these hybrid membranes were presented. The agreement between the numerical simulations and the characterizations was considered to be very satisfactory. These membranes proved to be very robust and the displacement of their center can reach 1 to 2 mm without damage. Their resonance frequencies range from 850 Hz to 2800 Hz and it was shown that they can operate at 200°C without aging. In addition, the optimization of a gold thermocompression assembly process has resulted in tensile breaking stresses of about 20-30 MPa, among the best reported in the literature. Prototype of 20x20x8mm three-phase micromachines were assembled, but their operation in motor mode could not be observed, even for a temperature difference of 100°C. However, when magnets were inserted to induce the displacement of the membranes by electromagnetic excitation, it was possible to observe an encouraging cooling effect. As a result of the work carried out, the main basic elements are now available and should allow further optimization under much more favorable conditions
Cruz, Vinicius Guimarães da. "Desenvolvimento experimental de um motor stirling tipo gama." Universidade Federal da Paraíba, 2012. http://tede.biblioteca.ufpb.br:8080/handle/tede/5341.
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES
The current paper develops an experimental Stirling engine Gama type. Different settings of this type of engine are presented (alpha, beta and gamma), along with the Stirling Cycle Definition and the mathematical modeling for each setting. It´s been Proceed a mathematical analysis based on the Stirling Theory, which is the method based upon the isothermical compression and expansion of an ideal gas, put to analysis by a computer software, determining the dependency between the engine s construction and functioning parameters. Bibliography used takes over the main Stirling engine settings and various working conditions, fed by a numerous types of fuels. The experimental part of the paper is assembling of a Stirling engine gamma type containing no regenerator, therefore, having the air as its working fluid, using electrical resistances as heat source, also a water jet at ambiance temperature to cool down the compression and heat exchanger. Engine tests were performed at atmospheric pressure, temperatures from 100 to 600 °C, 100 to 400 rpm rotations. The results are presented in graphics and are questioned.
O presente trabalho consiste no desenvolvimento experimental de um motor Stirling tipo gama. São apresentadas inicialmente as diferentes configurações deste tipo de motor (alfa, gama e beta), a definição do ciclo de Stirling e a modelagem matemática para cada configuração. Uma análise matemática é feita através da teoria de Schmidt, que é um método baseado na compressão e expansão isotérmica de um gás ideal, implementada em programa computacional permitindo determinar a dependência entre os parâmetros construtivos e de funcionamento do motor. A revisão bibliográfica contempla as principais configurações de motores Stirling e várias condições de funcionamento, alimentados por diversos tipos de combustíveis. A parte experimental do trabalho é a montagem de um protótipo de motor Stirling tipo gama sem regenerador tendo o ar como fluido de trabalho, utilizando resistências elétricas como fonte de calor e um fluxo de água a temperatura ambiente para o resfriamento do trocador de calor de compressão. Os testes do motor serão realizados a pressão atmosférica, para temperaturas de 100 a 600 °C e rotações de 100 a 400 rpm, os resultados são apresentados em gráficos e discutidos.
Majidniya, Mahdi. "Energy Storage & Conversion : Waste Heat Recovery in Microgrids by a free piston stirling engine." Electronic Thesis or Diss., Université de Lorraine, 2021. http://www.theses.fr/2021LORR0206.
In this study, a combined system of an FPSE and a PMLSM is investigated. First, a linear model (an already developed model in literature) and a nonlinear model (a new applied model in the present study) of the FPSE are developed, and the results of these models are compared. Then the most suitable model for the study, is chosen. It is shown that the linear model cannot identify the realistic behavior of the FPSE; thus, the nonlinear one should be used. After that, the nonlinear FPSE model is validated with available experimental results. After validating the FPSE model, two scenarios, including a decoupled one (an already existed one in literature) and a coupled one (a newly introduced method in the present study), are considered to study the enthalpy pumping loss on the FPSE system. Then the best scenario for the enthalpy pumping, which is the coupled one, is chosen based on the results. After that, the FPSE system is coupled with the presented PMLSM model. In order to combine the thermodynamic model of the FPSE and the electrodynamic model of the PMLSM, their dynamic equations are combined. Then, the thermo-electro-dynamic equations are solved, and the coupled system is controlled in MATLAB Simulink®. Controlling such a system makes it possible to avoid conditions leading to FPSE instability. Moreover, it is feasible to control the system in transient operating modes to get the best performance. After combining FPSE with PMLSM, two control methods are introduced, and their results are compared. These control methods are based on identifying the reference parameters. Then, an application of such a system is presented. This system is used as a waste heat recovery in a tri-generation system. The power source of this tri-generation system is a Solid Oxide Fuel Cell (SOFC) which is combined with a Double Effect Absorption Chiller (DEACH) for cooling production and a heat exchanger for providing the thermal needs. Finally, a study of the sensitivity to the parameters of such a system is performed. Using this analysis provides information concerning the sensitivity of such a system to different parameters
Hazda, Jakub. "Analýza Stirlingova oběhu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231710.
Su, C.-C. "An enquiry into the mechanism of the pressure drop in the regenerator of the Stirling cycle machine." Thesis, University of Cambridge, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.377258.
Mabrouk, Mohamed Tahar. "Production optimale d’énergie pour une communauté à petite échelle : application à l’optimisation d’une centrale solaire hybride produisant électricité et chaleur." Thesis, Université de Lorraine, 2015. http://www.theses.fr/2015LORR0163/document.
This work deals with the modelling and the optimization of thermodynamic solar power plants intended to supply electricity to isolated locations. Firstly, a state of the art of solar collectors is achieved and a model for parabolic trough collectors is proposed. This model is used for actual collectors identification. It is used also to propose correlations to be introduced in the whole system model. In a second time, a state of the art of energy storage technologies is conducted and an original model of a packed bed storage tank is proposed. This model gives an explicit solution of the temperature inside the tank without using a time step based numerical resolution. Two alternatives for the power block are given: Stirling engines and Organic Rankine Cycles. For Stirling engines, a critical review of existing models is performed. Some losses occurring in Stirling engines are not well documented in the literature as leakage losses at the power piston and displacer gap losses. Therefore, original models are proposed to estimate these losses. When compared to former models in the literature, the new model of the displacer gap losses demonstrates clearly that it is very important to use decoupled models with caution. Concerning the ORC, an optimization-oriented model is proposed. Finally, a mono and multi-objective optimization of a solar power plant is performed. The optimized system is composed of a solar field, a packed bed heat storage, a power block and an auxiliary fired heater. Objective functions used in this study are: the Levelized Cost of Electricity (LCOE), the energetic efficiency of the power plant and CO2 emission per kilowatt hour of electricity
Petre, Camelia. "Utilisation de la thermodynamique à vitesse finie pour l’étude et l’optimisation du cycle Carnot et des machines de Stirling." Thesis, Nancy 1, 2007. http://www.theses.fr/2007NAN10115/document.
The stated subject needed an important bibliographic research for the publications in the field of Thermodynamics with Finite Speed (TFS) and Thermodynamics in Finite Time (TFT), and more than that. The first chapter is dedicated to the current status in the chosen subject. A synthesis of worldwide energetic aspects, main considerations on Stirling machines, main methods for analysis and optimization are presented. An important paragraph is the comparison between TFS and TFT, since the original contributions represent two methods, one from TFS and the other one from TFT. The second chapter is dedicated to the original contributions in the field of TFS: adjustment of the Direct Method to the study and optimization of reverse cycle machines with internal and external irreversibilities; correction of the Schmidt method by considering the effective kinematics of the studied machine; development of a sensitivity study to analyze the effects of each irreversibility; adaptation of the Direct Method to the study and optimization of Stirling solar engines and solar assemblies receiver – concentrator - Stirling engine - electric generator; validation of the proposed scheme par comparison with experimental data; research practical utilization: a proposed solar system for electric energy and hydrogen (as an energy career) production. The third chapter is dedicated to the original contributions in the field of TFT. A thermodynamic model pour for the study and optimization of thermal machines is proposed and applied to the Carnot cycle, for more cases, for linear and non linear convective and radiative heat transfer laws. Existence of experimental data allowed the operating simulation and validation of the model. The general conclusions and perspectives are presented
Petre, Camelia Feidt Michel Petrescu Stoian. "Utilisation de la thermodynamique à vitesse finie pour l'étude et l'optimisation du cycle Carnot et des machines de Stirling." Nancy : Université de Nancy 1, 2007. http://www.scd.uhp-nancy.fr/docnum/SCD_T_2007_0115_PETRE.pdf.
Thèse soutenue en co-tutelle. Titre provenant de l'écran-titre. Bibliogr.
François, Pierre. "Contribution à la modélisation électromagnétique d’un générateur linéaire à induction appliquée à un micro-cogénérateur Stirling à piston libre." Thesis, Cachan, Ecole normale supérieure, 2011. http://www.theses.fr/2011DENS0003.
This thesis focuses on the development of a residential cogenerator which consists of a linear induction generator driven by two Stirling engines, free-piston double-acting operating mode. The criteria characterizing such cogenerator are described and its various modes of use in the residential sector. The various technologies are reviewed.The equations of mechanics that underlie the control of the coupling of thermoelectric cogeneration and stability are defined.The electric generator is modeled to calculate the electrical coil coupled equations and the magnitudes of the equivalent circuit, this scheme allows us to reverse the pattern. The results of analytical models are validated by measurements on specially designed models. A parametric study of the structure of the generator has optimized its performances. The equations of mechanical and electrical model are used to lay the groundwork for optimization of all the cogenerator, considered as a system
Gallo, Michal. "Model Stirlingova motoru v PSCAD." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2016. http://www.nusl.cz/ntk/nusl-242000.
Sathya, Santhana. "Fabrication of a thin film resistance heater." Ohio : Ohio University, 1999. http://www.ohiolink.edu/etd/view.cgi?ohiou1175624104.
Guo, Dongzhi. "Design, Analysis, Modeling and Testing of a Micro-scale Refrigeration System." Research Showcase @ CMU, 2014. http://repository.cmu.edu/dissertations/450.
Machado, Luis Paulo Silveira. "Propagação do momento linear e energia cinética em cadeias granulares afiladas." Universidade Federal da Paraíba, 2011. http://tede.biblioteca.ufpb.br:8080/handle/tede/5717.
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES
Recently, tapered granular chains have been studied for the development of impact-absorbing devices (shock waves). The characteristic of this system to mitigate shock waves (pulses of linear momentum), makes this material an excellent candidate for such absorbers. Therefore, many studies have been conducted in this direction, but most are numeric character, and some analytical. However, the analytical approximations presented do not show good fits with numerical solutions. In this work we study analytically the propagation of linear momentum and kinetic energy in one-dimensional tapered chains of spherical grains that interact according to the Hertz potential. We apply the binary approximation, based on the supposition that the energy transferred along the chain occurs through successive collisions between two particles. Four settings taper were studied: forward linear, forward exponential, backward linear and backward exponential. With the Binary Theory, we correctly anticipate the trends of increase and decrease the propagation of linear momentum and kinetic energy. However, to capture the correct values of the amplitudes of the pulses of these quantities we developed a numericalanalytic correction to the velocities of particles. Compared the results with numerical solutions of the equations of motion, where we use the Runge-Kutta fourth order. The results show: good agreement between the analytical and numerical theories; forward exponentially tapered chains are the most suitable in the design of absorbers (present exponential decay of linear momentum); a weaker scenario for the propagation of kinetic energy (due to quadratic dependence with the velocity), but the linear momentum is the quantity relevant in the context of impacts.Furthermore, we found good agreement with experimental results presented by F. Melo et al (2006). Thus, we present analytical expressions that capture correctly the propagation of linear momentum and kinetic energy in tapered granular chains. These systems actually demonstrate be excellent for absorbing shock waves, attenuating pulses of linear momentum and saturating kinetic energy. An extension of this work is to study tapered decorated chains and with precompression, allowing the absorption in chains composed of a number smaller grains (short chains).
Recentemente, cadeias granulares afiladas tem sido objeto de estudo para o desenvolvimento de dispositivos absorvedores de impacto (ondas de choque). A caracterıstica deste sistema em atenuar ondas de choque (pulsos de momento linear), torna este material um excelente candidato para tais absorvedores. Assim, vários estudos neste sentido foram realizados, por´em a maioria são de caráter numérico e, alguns, anal´ıticos. Todavia, as aproximaçoes analıticas apresentadas não demonstram bons ajustes com soluções numericas. Neste trabalho estudamos analiticamente a propagação do momento linear e energia cinetica em cadeias afiladas unidimensionais de graos esfericos que interagem segundo o potencial de Hertz. Aplicamos a aproximaçao binaria, baseada na suposiçao que a energia transferida ao longo da cadeia ocorre atraves de colis oes sucessivas entre duas part´ıculas. Estudamos quatro configuraçoes de afilamento: linear para frente, exponencial para frente, linear para tras e exponencial para tras. Com a Teoria Binaria, prevemos corretamente as tendencias de aumento e diminuiçao das propagaçoes do momento linear e energia cinetica. Contudo, para capturarmos os valores corretos das amplitudes dos pulsos dessas grandezas desenvolvemos uma correçao numerico-analıtica para as velocidades das partıculas. Confrontamos os resultados com soluçoes numericas das equaçoes de movimento, onde utilizamos o metodo de Runge-Kutta de quarta ordem. Os resultados demonstram: bom acordo entre as teorias analıtica e numerica; as cadeias afiladas exponencialmente para frente são as mais indicadas nos projetos de absorvedores (apresentam decaimento exponencial do momento linear); um cen´ario mais fraco para a propagação da energia cinetica (devido a dependencia quadratica com a velocidade), porem o momento linear e a grandeza relevante no contexto de impactos. Alem disso, obtivemos bom acordo com resultados experimentais apresentados por F. Melo e colaboradores (2006). Dessa forma, apresentamos expressoes analıticas que capturam corretamente as propagaçoes de momento linear e energia cinetica em cadeias granulares afiladas. Estes sistemas, realmente demonstram serem excelentes para absorver ondas de choque, atenuando pulsos de momento linear e saturando pulsos de energia cin´etica.Uma extensao deste trabalho sera estudar cadeias decoradas afiladas com pre-compressao, que permitem a absorçao de ondas de choque com numero menor de graos nas cadeias (cadeias curtas).
Rahmani, Mustapha Amine. "Gestion de l'énergie d'une micro-centrale solaire thermodynamique." Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENT077/document.
This Ph.D thesis was prepared in the scope of the MICROSOL project, ledby Schneider Electric, that aims at developing Off-grid solar thermodynamic micro powerplants exploiting the solar thermal energy. The aim of this thesis being the development of innovative and efficient control strategies for the energy management of two kinds of solar thermodynamic micro power plants: based on Stirling engine and based and Organic RankineCycle (ORC) machines.In a first part, we consider the Stirling based solar thermodynamic micro power planthybridized with a supercapacitor as an energy buffer. Within this framework, we propose afirst experimentally validated control strategy, associated to the energy conversion system ofthe Stirling engine, that endows the system with quasi optimal performances in term of settlingtime enabling the size reduction of the supercapacitor. A second control strategy that handlesexplicitly the system constraints while providing the system with optimal performances interm of settling time , is also proposed. This control strategy is in fact more than a simplecontroller, it is a control framework that holds for a family of energy conversion systems.In a second part, we consider the Organic Rankine Cycle (ORC) based thermodynamicmicro power plant hybridized with a battery bank as an energy buffer. Since this system worksat constant speed for the asynchronous generator electrically connected to a commercial energyconversion system, we propose a model predictive controller that acts on the thermodynamicpart of this system to move from an operating point to another, during the load power demandtransients, as fast as possible (to reduce the size of the battery banks) while respecting thephysical system constraints. The developed predictive controller is based upon a dynamicmodel, for the ORC power plant, identified experimentally thanks to an adequate nonlinearidentification algorithm
Thonger, J. C. T. "Stirling engine heat exchanger characteristics." Thesis, University of Reading, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.374702.
Dadd, M. W. "Stirling engine thermometry and heat transfer." Thesis, University of Reading, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.380107.
Berchowitz, David M. "Stirling cycle engine design and optimisation." Thesis, 2011. http://hdl.handle.net/10539/10873.
Isaac, Ivo de Souza. "Development of a Stirling cycle based cryocooler." Thesis, 2018. http://ethesis.nitrkl.ac.in/9939/1/2018_MT_216ME5399_DSIIvo_DevelopmentStirling__.pdf.
Berchowitz, David M. "A computer and experimental simulation of Stirling cycle machines." Thesis, 2011. http://hdl.handle.net/10539/10477.
Tsai, Dong-rong, and 蔡東融. "Measurement of Thermodynamic Cycle in a Rhombic-Drive Stirling Engine." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/04511367928604548843.
國立成功大學
航空太空工程學系碩博士班
97
The present study is aimed at performance measurement of a beta-type Stirling engine with rhombic drive mechanism. The cyclic variation of pressure and volume of the working medium in the cylinder can be predicted by using the analytical model proposed by Cheng and Yu [26], and the influence on performance of the geometric parameters of Stirling engine is evaluated. In addition a 10-W Stirling engine with rhombic drive is made in this study. The working medium used in the the engine is air, and engine is heated by an electric heater in the experiment. By installing a pressure transducer and a laser displacement sensor, the variation of pressure inside the cylinder and trajectory of piston is measured. Meanwhiles, the rotational speed of the engine can be obtained by a rotary encoder connected to the shaft of the flywheel. Displacers with different outside diameter and flywheels with different moments of inertia are tested. And various heat sources are considered during the test of engine. In the experiments, a comparison in performance based on different operating parameters is attempted. Results show that an increase in the heat source temperature yields a great increase in the power output of the Stirling engine. A similar trend is found both in the experiments and the simulation. The Stirling engine produces the highest rotational speed when the regenerative channel width (G) is settose 0.0006 m. The highest rotational speed is around 3140 rpm. When G =0.0004 m, the Stirling engine exhibits maxium power output and the maximum power output is 11.2 W. A change in the flywheel moment of inertia leads to no appreciable difference in the cyclic variation of pressure in the cylinder. The experimental data for the thermal efficiency of the engine basically agree with the predictions from the anslytical model proposed by Cheng and Yu [26].
"A state space and continuum mechanics analysis of stirling cycle machines." Thesis, 2015. http://hdl.handle.net/10539/16676.
Chou, Yen-Chih, and 周彥志. "Fabrication and Simulation of Stirling Cycle Engine Employing the Rotary Wankel Mechanism." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/18827283560291838215.
淡江大學
機械與機電工程學系博士班
97
Energy and environmental protection issues have become the most important targets of global investigation and development. The solar energy can be collected in a variety of different ways and it also called Concentrating Solar Power (CSP) systems emerging as one of the most promising sources of renewable energy. Some of them combined with Stirling engines as the key component to transfer energy and generate electricity. On this dissertation the author discusses the technical advantages of a technology with Stirling cycle engine which may combine to the solar-thermal-electric or CSP technology. Furthermore, it focuses on integrating the Wankel mechanism of rotary internal combustion engine with Stirling cycle in order to fabricate a new engine type. Some advantages like there exists no waste gas discharged for the system in working and it won’t contaminate the environment. It could be also according to the variety of heat source and with simpler mechanism as general Stirling engines. Besides, the shaft transmission is without using the crank. This dissertation includes the simulation analysis by FLUENT CFD software. It could relate to the design initially and provide criterions for improving the prototype by analyzing the factors of heat source temperature, operate pressure, phase angle of rotors, rotation speed, and porosity of regenerator. The simulation results show that better efficiency of system related to the higher temperature of heat input and higher operation pressure. Phase angle of rotors, and rotate speed effects are also discussed in this dissertation. In addition, the effect of porosity on regenerators shows efficiency increases with fill rate increased and decreased with porosity. The author additionally fabricated the prototypes and performed the preliminary test. Some factors of boundary conditions for simulation should be modified by comparing with the experimental data. Considering the physical properties of materials and manufacture limits, the experience of procedure from design to fabrication with results of simulation could bring up a suitable Rotary Stirling Cycle Engine (RSE) design. It can be helpful for future similar work and apply to solar-thermal-electric power generator scopes.
NagarajanRajendiran and 羅文俊. "Numerical predictions of thermodynamic cycle and thermal efficiency of thermal-lag Stirling engine." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/r5h29k.
國立成功大學
航空太空工程學系
105
This study is aimed at development of a numerical model for predicting thermodynamic cycle and thermal efficiency of thermal-lag Stirling engine. Thermal-lag Stirling engine is working through the principle of thermal-lag instability phenomenon. In thermal-lag engine, piston is the only moving part. So, the configuration of this engine is simpler when compared to other traditional Stirling engine. A computational fluid dynamics (CFD) numerical simulation method is used to predict the transient variations of pressure, temperature and working fluid mass in the individual working spaces of the engine. A parametric study of the effect of working gas pressure, heating temperature, cooling temperature, regenerator porosity and rotation speed on the performance of thermal-lag Stirling engine is carried out. Also, the numerical simulation of engine power output, torque and the thermal efficiency has been computed with the different operating speed, heating temperature, cooling temperature and the working gas pressure. The optimum engine speed at which the engine can reach the maximum power output and thermal efficiency has been determined. With the help of numerical simulation, the thermal-lag engine performance was analyzed with the different operating conditions.
GIU, MAO-ZHEN, and 邱茂鎮. "Studies of the flow through the wire screens in the regenerator of the stirling cycle maching." Thesis, 1988. http://ndltd.ncl.edu.tw/handle/45026835530733596627.
Costa, Rui Filipe Barbosa. "Analysis and comparison of thermodynamic behavior for Stirling and Ericsson cycles." Master's thesis, 2017. http://hdl.handle.net/10316/83421.
Stirling and Ericsson engines are external heat engines that offer the ability to use many different heat sources to provide reliable and sustainable power. In this thesis, we compare the Stirling and Ericsson cycles in order to determine in which situations one engine produces more net work output than the other. The net work output equations are derived and are analyzed for three different scenarios: (i) equal mass and temperature limits, (ii) equal mass and pressure or volume, and (iii) equal temperature and pressure or volume limits. The comparison is performed by calculating when both cycles produce the same net work output and then analyzing which one produces more net work output based on how the parameters are varied. In general, the results demonstrate that Stirling engines produce more net work output at higher pressures and lower volumes, and Ericsson engines produce more net work output at lower pressures and higher volumes. For certain scenarios threshold values are calculated to illustrate precisely when one cycle produces more net work output than the other. This thesis can be used to inform the design of the engines and particularly to determine when either a Stirling or Ericsson should be selected for a particular application.Stirling and Ericsson engines are external heat engines that offer the ability to use many different heat sources to provide reliable and sustainable power. In this thesis, we compare the Stirling and Ericsson cycles in order to determine in which situations one engine produces more net work output than the other. The net work output equations are derived and are analyzed for three different scenarios: (i) equal mass and temperature limits, (ii) equal mass and pressure or volume, and (iii) equal temperature and pressure or volume limits. The comparison is performed by calculating when both cycles produce the same net work output and then analyzing which one produces more net work output based on how the parameters are varied. In general, the results demonstrate that Stirling engines produce more net work output at higher pressures and lower volumes, and Ericsson engines produce more net work output at lower pressures and higher volumes. For certain scenarios threshold values are calculated to illustrate precisely when one cycle produces more net work output than the other. This thesis can be used to inform the design of the engines and particularly to determine when either a Stirling or Ericsson should be selected for a particular application.
Os motores Stirling e Ericsson são motores de calor externos que oferecem a capacidade de usar muitas fontes de calor diferentes para fornecer energia confiável e sustentável. Nesta tese, comparamos os ciclos Stirling e Ericsson para determinar em quais situações um motor produz mais trabalho do que o outro. As equações de trabalho são derivadas e são analisadas para três cenários diferentes: (i) limites de massa e temperatura iguais, (ii) massa e pressão ou volume iguais, e (iii) igual temperatura e pressão ou limites de volume. A comparação é realizada calculando quando ambos os ciclos produzem o mesmo trabalho e, em seguida, analisando em que situações um produz mais trabalho baseado em como os parâmetros são variados. Em geral, os resultados demonstram que os motores Stirling produzem mais trabalho com pressões mais altas e menores volumes, e os motores Ericsson produzem mais trabalho com pressões mais baixas e volumes maiores. Para certos cenários, os valores de limiar são calculados para ilustrar precisamente quando um ciclo produz mais trabalho do que o outro. Esta tese pode ser usada para informar o design dos motores e particularmente para determinar quando um Stirling ou Ericsson devem ser selecionados para uma aplicação específica.Os motores Stirling e Ericsson são motores de calor externos que oferecem a capacidade de usar muitas fontes de calor diferentes para fornecer energia confiável e sustentável. Nesta tese, comparamos os ciclos Stirling e Ericsson para determinar em quais situações um motor produz mais trabalho do que o outro. As equações de trabalho são derivadas e são analisadas para três cenários diferentes: (i) limites de massa e temperatura iguais, (ii) massa e pressão ou volume iguais, e (iii) igual temperatura e pressão ou limites de volume. A comparação é realizada calculando quando ambos os ciclos produzem o mesmo trabalho e, em seguida, analisando em que situações um produz mais trabalho baseado em como os parâmetros são variados. Em geral, os resultados demonstram que os motores Stirling produzem mais trabalho com pressões mais altas e menores volumes, e os motores Ericsson produzem mais trabalho com pressões mais baixas e volumes maiores. Para certos cenários, os valores de limiar são calculados para ilustrar precisamente quando um ciclo produz mais trabalho do que o outro. Esta tese pode ser usada para informar o design dos motores e particularmente para determinar quando um Stirling ou Ericsson devem ser selecionados para uma aplicação específica.
Wolfová, Mária. "Kombinatorické úlohy o permutacích." Master's thesis, 2019. http://www.nusl.cz/ntk/nusl-405207.