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 27 for “"thermodynamic efficiency"”.
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An Optimization of Thermodynamic Efficiency vs. Capacity for Communications Systems
… view of the mechanisms which affect the power efficiency of communications processes along with a method for efficiency enhancement. Shannon's work is the definitive source for analyzing information capacity of a communications system but his formulation does not predict an efficiency …
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Solar thermochemical conversion of CO2 into fuels using Ni-Ferrite driven redox reactions: Thermodynamic efficiency analysis
… syngas and fuels. This study examines the thermodynamic performance of nickel ferrite (NiFe2O4) as a redox material in solar thermochemical CO₂ splitting processes. To evaluate how different factors influence the efficiency of this process, a detailed thermodynamic model was created. This …
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Desalination and its potential for harnessing brine and solar energy in the US Virgin Islands
… specific reference to the US Virgin Islands. Thermodynamic efficiency, industrial ecology, and renewable energy were assessed for their application in desalination and contextual relevance to specific desalination processes. Renewable energy was determined to provide the greatest near-term …
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Enhanced geothermal energy and cogeneration : design, technology and economics
… busbar cost for electricity produced and various thermodynamic efficiency measures will be used as metrics to access the effectiveness of cogeneration design in HDR power generation. Lastly, this research is used to qualitatively evaluate the performance of other low-temperature electric-power and …
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Planning energy systems for small, rural communities (including economic, technical and thermodynamic criteria)
… are proposed: economic optimisation and thermodynamic optimisation. Both methods are applied to the small Scottish island of Eigg, as an example of a small community. It is shown that, for the range of energy equipment studied, the two methods are generally complementary. Economic theory …
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Theoretical characterisation of spheroidal PbSe/PbS Core/Shell colloidal quantum dot heterostructures
… of the field of photovoltaics. While the maximum efficiency of conventional solar cell (SC) devices is limited to ∼ 31% (Shockley-Queisser limit), devices based on NQDs may attain a maximal thermodynamic efficiency of 42% through the exploitation of multiple exciton generation (MEG). In this …
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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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Capacitive deionization performance of bi-tortuous activated carbon electrodes coated with asymmetrically charged polyelectrolytes
… like equivalent circuit resistance and charge efficiency also greatly impact CDI operation and performance. Planar composite CDI electrodes exhibit poor energetic performance due the resistance associated with salt depletion and tortuous diffusion in the macroporous structure. In this work, we …
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Thermodynamic and topological characterization of living systems
… theoretical models can provide insights into the thermodynamic efficiency of important cellular processes. In experiments however, many degrees of freedom typically remain hidden to the observer, making thermodynamic inference challenging. Here, we introduce a framework to infer improved bounds on …
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Design Exploration of a Miniaturized Stirling Engine
… with their proven capability to attain high thermodynamic efficiency (30-40%), offer a promising solution if this efficiency can be maintained in a miniaturized form [2]. This study delves into the design space of a miniaturized Stirling engine with a target input of 2Wth, which could be …
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Design of a multi-spool, high-speed, counter-rotating aspirated compressor
… gas turbine aircraft engine design are improved efficiency and reduced engine weight. The drive for improved efficiency leads to high pressure ratio compressors with multiple stages, as thermodynamic efficiency increases with pressure ratio. These compressors are both heavy and expensive. Recent …
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A system study on the use of aspirated technology in gas turbine engines
Increasing aircraft engine efficiency and reducing the engines weight have driven innovation in the aircraft engine business since its inception. By simply looking at the Brayton cycle increasing the compressor pressure ratio can bring about an increase in efficiency. To achieve this high pressure …
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Effects of engine operating conditions on catalyst light-off and combustion variability
… gasoline engines are often associated with the efficiency of three-way catalytic converters and the time they take to reach light-off temperature, since a well-functioning converter reduces the tail pipe emissions by up to 99 %. Previous research suggests that exhaust gas back pressure could …
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Nuclear Electric Propulsion with Low Enriched Uranium
… core temperatures and brings a reduction in thermodynamic efficiency. The impact on overall system mass of choosing an LEU over a HEU fuel is examined in the context of a prismatic, gas-cooled reactor using a tri-structural isotropic (TRISO) fuel form, in conjunction with a direct Brayton …
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On the Challenges of integrating a Rotating Detonation Combustor with an Industrial Gas Turbine and important design considerations for Row-1 Blades
… fuels. In this effort to increase the efficiency and performance of such gas turbine power cycles, pressure gain combustion (PGC) has gained significant interest. The potential for an increase in the thermodynamic efficiency over the constant-pressure Brayton Cycle has made detonation …
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Exposure and Characterization of Candidate Materials for Use in Supercritical Water Reactors
… steam generating system lead to an increase in thermodynamic efficiency. Supercritical water systems have already been employed in fossil fuel power generation, and a proposed Gen IV nuclear reactor is designed to do the same which would result in an increase in efficiency by ~40% compared to …
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Influence of Fuel Inhomogeneity and Stratification Length Scales on Detonation Wave Propagation in a Rotating Detonation Combustor (RDC)
… engine has the key advantage of increased thermodynamic efficiency over the traditional constant pressure combustor. These detonation-based engines are also known as Pressure Gain Combustion systems (PGC) and Rotating Detonation Combustor (RDC) is a form of PGC, in which the detonation wave …
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Computational Methods for Optimizing Rotating Detonation Combustor (RDC) to Integrate with Gas Turbine
… recent years due to its potential for increased thermodynamic efficiency over a constant pressure cycle (or Brayton cycle). A rotating detonation combustor (RDC) is a type of PGC system, which is thermodynamically more efficient than the conventional gas turbine combustor. One of the main aspects …
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The role of TNP-Nucleotides, LYS492 and CA²⁺chelators in the skeletal muscle sarcoplasmic reticulum CA²⁺atpase cycle
… for 50 nmols Ca²⁺ to be accumulated. Increased thermodynamic efficiency of the pump and contaminating heavy metal ions were considered as possible mechanisms. To some extend Zn²⁺ and Cd²⁺, but not Fe²⁺ and Cu²⁺, appeared to reverse the partial inhibition. While interpretation of the results is …
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Bonding mechanisms in the application of thermal barrier coatings to turbine blades.
… environmental degradation as well as to increase thermodynamic efficiency. Most TBC systems consist of a ceramic thermal barrier coating such as partially stabilized zirconia adhering to an oxidation resistant bond coat, which in turn is bonded to the turbine blade. This is required since …
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