Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 153 for “"exergy"”.
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Exergy analysis of a Stirling cycle
… included was used to perform an exergy analysis of the GPU-3 Stirling engine. This model compared well with experimental results and the results from other models found in the literature. The results of the study show the two different approaches in modelling the engine losses and …
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Energy, exergy and exergoeconomic analyses of gas-turbine based systems
… From the balancing of mass, entropy, energy, exergy and cost equations, a greater understanding of the systems as well as their efficiencies is achieved. The parametric study and plant optimization are performed to investigate the effects of the variation of specific input parameters such as …
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Exergy Analysis of Pulverized Coal-Fired Ultra Supercritical Power Plants
… analysis. This research deals mainly with the exergy analysis of coal-fired power plants operating in ultra supercritical conditions. The main steam conditions used for the model development are 750oC temperature and 35 MPa pressure. The primary objective of this study is to analyze the various …
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Dynamic exergy-based methods for improving the operation of building energy systems
… the application of conventional and advanced exergy-based methods. Two different case studies are considered here. The first one is a theoretical single-office building equipped with heating and ventilation systems, located in a typical cold-climate region. The second case study is a real-life …
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A thermodynamics based analysis of exergy destruction in vapor compression cycle systems
… of these components through the use of exergy analysis. Despite many studies varying across different types of refrigerants, different physical components, and different cooling capacities, there has been no effort made to analyze the exergy destruction caused by combinations of the …
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Exergy Methods for the Generic Analysis and Optimization of Hypersonic Vehicle Concepts
… presents detailed results of the application of exergy-based methods to highly dynamic, integrated aerospace systems such as hypersonic vehicle concepts. In particular, an exergy-based methodology is compared to a more traditional based measure by applying both to the synthesis/design and …
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Energy ans exergy analysis of biomass co-firing in pulverized coal power generation
… the near future. In the present work, energy and exergy analyses are carried out for a co-firing based power generation system to investigate the impacts of biomass cofiring on system performance and gaseous emissions of CO2, NOx, and SOx. The power generation system considered is a typical …
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Exergy Methods for the Mission-Level Analysis and Optimization of Generic Hypersonic Vehicles
… and turn mission segments. An exergy approach to the vehicle synthesis/design, in which trade-offs between dissimilar technologies are observed, is proposed and measured against traditional methods of assessing highly integrated systems. A quasi one-dimensional hypersonic …
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The development of a controllability Index based on RGA and Exergy for plantwide control problems
… the potential of the thermodynamic property exergy is used. The combination of the 1st and 2nd laws of thermodynamics gives rise to the concept of Exergy. Exergy combines control scheme selection and eco-efficiency into a single domain. Exergy has many valuable uses in process design and …
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Exergy Based SI Engine Model Optimisation. Exergy Based Simulation and Modelling of Bi-fuel SI Engine for Optimisation of Equivalence Ratio and Ignition Time Using Artificial Neural Network (ANN) Emulation and Particle Swarm Optimisation (PSO).
In this thesis, exergy based SI engine model optimisation (EBSIEMO) is studied and evaluated. A four-stroke bi-fuel spark ignition (SI) engine is modelled for optimisation of engine performance based upon exergy analysis. An artificial neural network (ANN) is used as an emulator to speed up the …
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Exergy and exergoeconomic analyses and optimization of thermal management systems in electric and hybrid electric vehicles
… are analyzed with respect to conventional exergy analyses. In addition, advanced exergy analyses are also conducted in order to better identify critical relationships between the TMS components and determine where the system improvement efforts should be concentrated. Moreover, investment …
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A Study of Morphing Wing Effectiveness in Fighter Aircraft using Exergy Analysis and Global Optimization Techniques
… results of the application of energy- and exergy-based methods to the integrated synthesis/design of an Air-to-Air Fighter (AAF) aircraft with and without wing-morphing capability. In particular, a morphing-wing AAF is compared to a traditional fixed-wing AAF by applying large-scale …
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Numerical investigation of ion transport mechanisms in electrochemical energy storage devices: Similarity correlation and exergy destruction analysis
… ion-exchange membranes, we perform comprehensive exergy destruction analysis, using the first and second laws of thermodynamics, to quantify the energy losses arising due to electron-conduction, pore-scale mass transfer, reaction kinetics, species transport, and electrolyte mixing in the tanks. …
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A detailed study of desalination exergy models and their application to a semi-conductor ultra-pure water plant
… focus in terms of energy consumption mitigation. Exergy analysis is perhaps the most powerful tool available in the search for industrial energy efficiency. The objective of this research was to develop an approach for the exergy analysis of Semiconductor UPW plants in an effort to characterise …
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Novel configuration of a hybrid sustainable water desalination system (RO-HDH) power by solar energy. Modeling and exergy analysis
La falta de acceso al agua potable es un problema en muchas regiones del planeta. Existe una creciente crisis en todo el mundo debido al rápido agotamiento de las fuentes de agua dulce, incluidos los ríos y las aguas subterráneas. A medida que crezca la población mundial, mejore el nivel de vida de …
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A Combined Energy–Exergy Approach for Improving Refrigeration Systems in Deep-Level Gold Mines: Method Development and Case Study Validation
… Previous studies have suggested energy- or exergy analyses to improve performance; however, a combined approach has not been implemented on a deep-level mine. A methodical approach is needed to apply thermodynamic analysis techniques to refrigeration systems for improved performance. This …
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Energy, exergy and cost analyses of nuclear-based hydrogen production via thermochemical water decomposition using a copper-chlorine (Cu-CI) cycle
… is evaluated through energy and exergy efficiencies. Various parametric studies on energetic and exergetic aspects with variable reaction and reference-environment temperatures are carried out. A detailed analysis of the general methodology of cost estimation for the proposed …
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Investigation of the Effects of Various Energy and Exergy-Based Objectives/Figures of Merit on the Optimal Design of High Performance Aircraft System
This thesis work shows the advantages of applying exergy-based analysis and optimization methods to the synthesis/design and operation an Advanced Aircraft Fighter (AAF) with three subsystems: a Propulsion Subsystem (PS), an Environmental Control Subsystem (ECS), and an Airframe Subsys-tem - …
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