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.
Results
Showing 1 to 20 of 42 for “"Exergy efficiency"”.
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Development and analysis of solar energy based multigeneration systems
… show that, System 1 has a maximum energy efficiency of 43% and a maximum exergy efficiency of 65%, based on the produced maximum power of 48 kW which results in a CO2 reduction of 1613 tons per year which a minimum cost of $236,024 using renewable energy as a source. System 2 has a maximum …
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Resource Efficiency in the Chemical Industry
… future, industry is often harder to decarbonise. Efficiency in the use of both materials and energy can be a powerful tool for addressing a wide range of industrial emissions mechanisms, but these approaches are often pursued separately. Exergy analysis is a powerful assessment tool that can …
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Exergoeconomic analysis and optimization of organic Rankine cycles
… which one will provide the most power output and efficiency within system constraints. Using optimization, each fluid is tested within physical constraints for optimal operating conditions using system exergy efficiency as the objective function. An exergoeconomic analysis is performed to predict …
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Investigation of thermal management options for robots
… polyurethane. At the same temperature, the exergy efficiencies for the utilization of these thermal insulating materials are 23.66% for the stone wool, 18.19% for the fiberglass, and 20.73% for the extruded polyurethane. At the -25⁰C, the energy efficiencies are 49.91% for the stone wool, …
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Development and investigation of an ammonia synthesis reactor
… and tested under various conditions. The Faraday efficiency of the reactor is 5.4 % and the ammonia production capacity is 1.2×10-10 mol/cm2.s. Furthermore, the experiments on ammonia synthesis are performed with EMF and without EMF on the reactor and the change in potential is recorded to be 1.7 …
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Analysis of hydrogen-based energy storage pathways
… intermittent wind and solar power. In this work, exergy efficiency and cost analyses are conducted to compare pathways of hydrogen generation (PEM, alkaline or solid oxide electrolysis), storage (compression, liquefaction or methanation), transportation (trailer or pipeline) and utilization …
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First Principles Development of the Efficiency Limits of Roto-Compound Engines
… several core questions in the science of engine efficiency with a rigorous first principles approach, and then to understand the efficiency potential of roto-compound engines. The research includes original contributions to fundamental and applied engine thermodynamics, cycle and combustion …
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Estocagem por estratificação térmica de líquido em reservatório
… to diameter ratio (H/D) of the vessel on the exergy efficiency is studied.
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Exergy and exergoeconomic analyses and optimization of thermal management systems in electric and hybrid electric vehicles
… parameters are selected to maximize the system efficiency. In order to achieve this goal, a model of the liquid thermal management system is established to determine the irreversibilities and second-law efficiencies associated with the overall system and its components. Furthermore, the effects …
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Investigation of energy storage options for thermal management in hybrid electric vehicles
… vehicle to decrease the cooling load. Energy and exergy analyses have also been conducted for a new cooling system of the vehicle, in which the passive latent heat storage thermal management system is integrated with the active refrigeration cycle. The overall exergy efficiency of the system with …
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Development of a new hybrid photochemical/electrocatalytic water splitting reactor for hydrogen production: design, analysis and experiments
… verification of new methods to enhance system efficiency. The scope of this thesis is to present a thorough understanding of complete photocatalytic water splitting system performance under realistic working conditions. In this dissertation, an experimental apparatus for hydrogen and oxygen …
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Experimental investigation of novel proton exchange membrane fuel cell and battery integrated system
… performed through the polarization curve, energy efficiency, exergy efficiency, and open circuit voltage. Furthermore, the performance evaluation of the fuel cell and battery integrated system is performed. The performance assessments of the system are performed through the energy and exergy …
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Modeling, analysis and optimization of integrated energy systems for multigeneration purposes
… to mitigate global warming and increase the efficiency of energy systems are key objectives, with ways to meet them proposed and tested in many countries. Among these technologies, multigeneration processes stand out as a possibility for making important contributions due to their potential …
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Thermodynamic analysis and performance evaluation of PTC receiver with external annular fins
… that introduction of fins increases thermal efficiency of the receiver. An increase of 2.26 percent for Tin = 350 K, 2.21 percent for Tin = 400 K and 2.22 percent for Tin = 500 K was recorded for varying Reynolds numbers. Also, the thermal efficiency in t = 10 mm was higher than t = 5 mm with …
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Design and evaluation of solar and geothermal energy systems integrated with Cu-Cl cycle
… to the results, the highest overall energy efficiency is calculated for system 2 as 27.4%, and the highest overall exergy efficiency is calculated for system 3 as 18.6%. Integration of the Cu-Cl cycle with solar and geothermal based systems is led to prevent waste production and achieve …
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Investigation of energy storage options for sustainable energy systems.
… a thorough analysis from the points of energy, exergy, and exergoeconomics. The main objective of this thesis is to investigate energy storage options for sustainable energy systems. A technology description and illustration of concerns regarding each system is presented. Moreover, the …
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Thermodynamic analysis of ammonia and urea fed solid oxide fuel cells
… overall performance as well as the thermal and exergy efficiencies. The findings of this study showed that the overall performance and efficiency of the ammonia fed SOFC is superior in comparison to that of the urea fed counterpart. In particular, the ammonia fed system combined with …
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Numerical modelling of thermoacoustic engines and coolers
… heating temperature and improving overall system efficiency. Traditional one-dimensional linear model such as DeltaEC remains useful for preliminary estimations, but their simplified assumptions neglect non-linear flow effects and overestimate performance, especially in configurations where strong …
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Performance and emission characteristics of natural gas combined cycle power generation system with steam injection and oxyfuel combustion.
… popularity due to their high power generation efficiency and reduced emission. In the present work, combined cycle power generation configuration systems studied with natural gas as primary fuel oxidizes with air and pure oxygen separately. Steam is injected in main combustion chamber and …
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Multi-dimensional modeling of transient transport phenomena in molten carbonate fuel cells
… model is utilized to examine energy efficiency, exergy efficiency and entropy generation of a MCFC. By changing the operating temperature from 883 K to 963 K, the energy efficiency of the unit cell varies from 42.8 % to 50.5 % while the exergy efficiency remains in the range of 26.8% …
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