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 30 for “"Power Cycles"”.
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Thermo-economic optimation of slim power cycles : a case of Ngozi geothermal project-Tanzania
… strategy in terms of wellbore size selection and power plant technology to be used, for the development of Ngozi geothermal field in Tanzania. To obtain this, a comparative thermo-economic analysis of slim wells against full size wells is done for a selection of power plant cycles. To obtain a …
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A software tool for the preliminary performance modelling of central receivers and associated power cycles
… was limited to the thermodynamic study of the power cycle and receiver. The receiver model was validated by comparing results to published data. The model was able to simulate billboard, C-cavity and cylindrical receivers within 1% in cases involving single-phase fluids and by at most 3% - 5% …
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Techno-economic analysis of sour gas oxy-fuel combustion power cycles for carbon capture and sequestration
… dioxide emissions than traditional fossil fuel power plants. One of these unconventional fuels is sour gas. Sour gas consists of mainly methane, containing large concentrations of hydrogen sulfide and carbon dioxide. Over 30% of the world's natural gas reserves are considered sour. However this …
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Rotary (redox) reactor-based oxy combustion chemical looping power cycles for CO₂ capture : analysis and optimization
A number of CO₂ capture-enabled power generation technologies have been proposed to address the negative environmental impact of CO₂ emission. An important barrier to adopting these technologies is the associated energy and economic penalties. Chemical-looping (CLC) is an oxycombustion technology …
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The Art of SRAM Security: Tactics for Remanence-based Attack and Strategies for Defense
… a device's low-level behavior, such as power consumption. Traditional software-based security measures fall short in defending against the full spectrum of attacks, particularly those involving physical tampering with system hardware. This underscores the critical importance of …
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Computer simulations to calculate energy flux and image size on a receiver for different reflector geometries using caustics
… to generate electricity within conventional power cycles. The most common device used for concentrating the sun is the Heliostat, which is sun-tracking system comprised of mirror segments used to reflect sunlight onto a predefined target. This project aims to connect solar energy flux and …
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Securing the Future of 5G Smart Dust: Optimizing Cryptographic Algorithms for Ultra-Low SWaP Energy-Harvesting Devices
… dust possible, stretching computation across power cycles affects cryptographic algorithms. This effect may lead to new security issues that make the system vulnerable to adversary attacks. Therefore, security measures are needed to protect data at rest and in transit across the network. In …
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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
With the ever-growing demand for power generation to support the world economy and electric transportation needs, efficient gas turbine power cycles need to be investigated to match the anticipated high demands of the future. Decarbonization efforts around the world to achieve Net Carbon Zero by …
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Second law analysis of a waste heat recovery combined power cycle using transcritical carbon dioxide
Common power cycles discard a large portion of useful energy into the environment via exhaust gasses. Through the use of cascade bottoming cycles, this wasted exergy may be utilized for power generation and hot water production. Heat transfer between cycles occurs through a heat exchanger. To …
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Opportunity for Long Duration Storage Technologies: Thermal and Compressed Air Energy Storage
… rapid decarbonization is necessary. The electric power sector contributes about 25% of US and global emissions, and its decarbonization is critical as other sectors become increasingly electrified. Intermittent renewable energy sources, namely solar photovoltaics and wind turbines have reduced …
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Techno-economic analysis of pressurized oxy-fuel combustion power cycle for CO₂ capture
… have driven extensive research into new power generation cycles that enable carbon dioxide capture and sequestration. In this regard, oxy-fuel combustion is a promising new technology for capturing carbon dioxide in power generation systems utilizing hydrocarbon fuels. Combustion of a …
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Systems-level design of ion transport membrane oxy-combustion power plants
… the penalties associated with CO 2 capture from power plants. Oxygen separation in an ITM system consists of many distinct physical processes, ranging from complex electrochemical and thermochemical reactions to conventional heat and mass transfer. The dependence of ITM performance on power cycle …
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Simulation of optical impacts of gravity-induced deformations of concentrating solar collectors
Concentrating solar power (CSP) is a large field of interest in the renewable energy sector. However, CSP has not yet become as economical as other renewable energy technologies. A possible solution to this issue is the ability to produce efficient and cost-effective solar collectors such as …
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Modeling and analysis of hybrid geothermal-solar thermal energy conversion systems
… The goal is to find cost-effective hybrid power cycles that take advantage of the potential synergies of solar thermal and geothermal resources. One aspect is to determine the hybrid configuration that yields the highest annualized electricity generation. The levelized cost of electricity …
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A supercritical carbon dioxide cycle for next generation nuclear reactors
… of the family of supercritical CO2 Brayton power cycles for application to advanced nuclear reactors. The recompression cycle is shown to excel with respect to simplicity, compactness, cost and thermal efficiency. The main advantage of the supercritical CO2 cycle is comparable efficiency …
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Experimental characterization of condensation behavior for metastable carbon dioxide
… oil recovery (EOR), and Supercritical CO₂ power cycles. Modelling of non-equilibrium condensation requires knowledge of the fluid's metastable (subcooled-vapor) properties and related stability limit, known as the Wilson line. While there have been computational studies on metastable CO₂, …
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Chemical kinetic modeling of oxy-fuel combustion of sour gas for enhanced oil recovery
… behavior of sour gas and the design of power cycles with EOR. The reaction mechanism was constructed by combining mechanisms for the oxidation of CH4 and H2S and optimizing the sulfur sub-mechanism. The optimized mechanism was validated against experimental data for oxy-fuel combustion …
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Techno-economic evaluation of cross-cutting technologies for cost reduction in nuclear power plants
… advanced instrumentation and control, advanced power cycles, embedment, energy storage, and robotics. As plant overnight costs and construction times have tripled in the US since Three Mile Island, such technologies thus have significant potential to aid a troubled industry. These estimates …
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Thermofluid design and analysis of centrifugal compressors for a 50 MWe concentrated solar power supercritical CO₂ Brayton power cycle
Brayton power cycles employing supercritical CO₂ (sCO₂) as the working fluid are attracting growing interest for use in concentrated solar power (CSP) plants. The primary motivation is to enhance the efficiency of the power block and reduce overall system costs by utilising the high efficiency, …
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A reduced order modelling methodology for external cylindrical concentrated solar power central receivers
The use of supercritical carbon dioxide (sCO2) power cycles for concentrated solar power (CSP) applications is becoming increasingly attractive since these cycles may offer lower capital costs and increased thermal efficiency. However, there are currently no utility-scale sCO2-CSP tower plants in …
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