The Experts below are selected from a list of 13842 Experts worldwide ranked by ideXlab platform
Noam Lior - One of the best experts on this subject based on the ideXlab platform.
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exergy analysis of an operating boiling water reactor Nuclear power Station
1995Co-Authors: William R Dunbar, Scott D Moody, Noam LiorAbstract:Abstract A Second Law analysis is performed on the LaSalle County Nuclear Station of the Commonwealth Edison Company to evaluate plant and subsystem irreversibility. The results disclose that over 80% of the exergy destroyed during plant operation is result of the highly irreversible fission and heat transport processes within the reactor vessel. Plant efficiency and effectiveness are found to be 34.4%, well below the 40–45% efficiencies of typical fossil-fuel-fired power generating Stations. Based on these well-known numbers, and the results of the exergy analysis, one recommendation is to reevaluate the integration of fossil-fuel-fired superheat/reheat units located downstream of the reactor vessel. This modified plant configuration would not only improve efficiency by raising the top operating temperature, but it is also anticipated to reduce the irreversibility associated with heat transfer in the steam generators.
A. R. Bahadorimehr - One of the best experts on this subject based on the ideXlab platform.
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Capacitive pressure sensors based on MEMS, operating in harsh environments
2008Co-Authors: Y. Hezarjaribi, Sayyed-hossein Keshmiri, Mohd Nizar Hamidon, A. R. BahadorimehrAbstract:Poly-crystalline silicon carbide (polysic) Micro-electromechanical systems (MEMS) capacitive pressure sensors operating at harsh environments (e.g. high temperature) are proposed because of SiC owing excellent electrical stability, mechanical robustness, and chemical inertness properties. The principle of this paper is, design, simulation. The application of SiC pressure sensors are in a harsh environments such as automotive industries, aerospace, oil/logging equipments, Nuclear Station, power Station. The sensor demonstrated a high temperature sensing capability up to 400degC, the device achieves a linear characteristic response and consists of a circular clamped-edges poly-sic diaphragm suspended over sealed cavity on a silicon carbide substrate. The sensor is operating in touch mode capacitive pressure sensor, The advantages of a touch mode are the robust structure that make the sensor to withstand harsh environment, near linear output, and large over-range protection, operating in wide range of pressure, higher sensitivity than the near linear operation in normal mode, so in this case some of stray capacitance effects can be neglected.
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Pressure sensors based on MEMS, operating in harsh environments (touch-mode)
2008Co-Authors: Y. Hezarjaribi, Mohd Nizar Hamidon, A. R. BahadorimehrAbstract:In this paper, Poly-crystalline silicon carbide (poly-sic) Micro-electromechanical systems (MEMS) capacitive pressure sensor operating in harsh environment in touch mode is proposed, The principle of the paper is to design, obtain analytical solution and compare the results with the simulation for a circular diaphragm deflection before and after touch point. The sensor demonstrated a high temperature sensing capability up to 400°C, the device achieves a linear characteristic response and consists of a circular clamped-edges poly-sic diaphragm suspended over sealed cavity on a silicon carbide substrate. The sensor is operating in touch mode capacitive pressure sensor, The advantages of a touch mode are the robust structure that make the sensor to withstand harsh environment, near linear output, and large over-range protection, operating in wide range of pressure, higher sensitivity than the near linear operation in normal mode, The material is considered to be used for harsh environment is SiC (Silicon Carbide), Because of SiC owing excellent electrical stability, mechanical robustness, and chemical inertness properties and the application of pressure sensors in harsh environments are, such as automotive industries, aerospace, oil/logging equipments, Nuclear Station, and power Station. We are simulating MEMS capacitive pressure sensor to optimize the design, improve the performance and reduce the time of fabricating process of the device. The proposed touch mode MEMS capacitive pressure sensor demonstrated diaphragm ranging from 150 μm to 360 μm in diameter, with the gap depth from 0.5 μm to 7.5 μm and the sensor exhibit a linear response with pressure from 0.05 Mpa to 10 Mpa.
William R Dunbar - One of the best experts on this subject based on the ideXlab platform.
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exergy analysis of an operating boiling water reactor Nuclear power Station
1995Co-Authors: William R Dunbar, Scott D Moody, Noam LiorAbstract:Abstract A Second Law analysis is performed on the LaSalle County Nuclear Station of the Commonwealth Edison Company to evaluate plant and subsystem irreversibility. The results disclose that over 80% of the exergy destroyed during plant operation is result of the highly irreversible fission and heat transport processes within the reactor vessel. Plant efficiency and effectiveness are found to be 34.4%, well below the 40–45% efficiencies of typical fossil-fuel-fired power generating Stations. Based on these well-known numbers, and the results of the exergy analysis, one recommendation is to reevaluate the integration of fossil-fuel-fired superheat/reheat units located downstream of the reactor vessel. This modified plant configuration would not only improve efficiency by raising the top operating temperature, but it is also anticipated to reduce the irreversibility associated with heat transfer in the steam generators.
Y. Hezarjaribi - One of the best experts on this subject based on the ideXlab platform.
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Capacitive pressure sensors based on MEMS, operating in harsh environments
2008Co-Authors: Y. Hezarjaribi, Sayyed-hossein Keshmiri, Mohd Nizar Hamidon, A. R. BahadorimehrAbstract:Poly-crystalline silicon carbide (polysic) Micro-electromechanical systems (MEMS) capacitive pressure sensors operating at harsh environments (e.g. high temperature) are proposed because of SiC owing excellent electrical stability, mechanical robustness, and chemical inertness properties. The principle of this paper is, design, simulation. The application of SiC pressure sensors are in a harsh environments such as automotive industries, aerospace, oil/logging equipments, Nuclear Station, power Station. The sensor demonstrated a high temperature sensing capability up to 400degC, the device achieves a linear characteristic response and consists of a circular clamped-edges poly-sic diaphragm suspended over sealed cavity on a silicon carbide substrate. The sensor is operating in touch mode capacitive pressure sensor, The advantages of a touch mode are the robust structure that make the sensor to withstand harsh environment, near linear output, and large over-range protection, operating in wide range of pressure, higher sensitivity than the near linear operation in normal mode, so in this case some of stray capacitance effects can be neglected.
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Pressure sensors based on MEMS, operating in harsh environments (touch-mode)
2008Co-Authors: Y. Hezarjaribi, Mohd Nizar Hamidon, A. R. BahadorimehrAbstract:In this paper, Poly-crystalline silicon carbide (poly-sic) Micro-electromechanical systems (MEMS) capacitive pressure sensor operating in harsh environment in touch mode is proposed, The principle of the paper is to design, obtain analytical solution and compare the results with the simulation for a circular diaphragm deflection before and after touch point. The sensor demonstrated a high temperature sensing capability up to 400°C, the device achieves a linear characteristic response and consists of a circular clamped-edges poly-sic diaphragm suspended over sealed cavity on a silicon carbide substrate. The sensor is operating in touch mode capacitive pressure sensor, The advantages of a touch mode are the robust structure that make the sensor to withstand harsh environment, near linear output, and large over-range protection, operating in wide range of pressure, higher sensitivity than the near linear operation in normal mode, The material is considered to be used for harsh environment is SiC (Silicon Carbide), Because of SiC owing excellent electrical stability, mechanical robustness, and chemical inertness properties and the application of pressure sensors in harsh environments are, such as automotive industries, aerospace, oil/logging equipments, Nuclear Station, and power Station. We are simulating MEMS capacitive pressure sensor to optimize the design, improve the performance and reduce the time of fabricating process of the device. The proposed touch mode MEMS capacitive pressure sensor demonstrated diaphragm ranging from 150 μm to 360 μm in diameter, with the gap depth from 0.5 μm to 7.5 μm and the sensor exhibit a linear response with pressure from 0.05 Mpa to 10 Mpa.
Kamiel Gabriel - One of the best experts on this subject based on the ideXlab platform.
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synergistic roles of off peak electrolysis and thermochemical production of hydrogen from Nuclear energy in canada
2008Co-Authors: G F Naterer, Michael Fowler, J S Cotton, Kamiel GabrielAbstract:Abstract Hydrogen as a clean energy carrier is frequently identified as a major solution to the environmental problem of greenhouse gases, resulting from worldwide dependence on fossil fuels. However, most of the world's hydrogen (about 96%) is currently produced from fossil fuels, which does not address the issue of greenhouse gases. Although there is a large motivation of the “hydrogen economy”, for improvement of urban air quality, energy security, and integration of intermittent renewable energy sources, CO2 free energy sources are critical to hydrogen becoming a significant energy carrier. Two technologies, applied in tandem, have a promising potential to generate hydrogen without leading to greenhouse gas emissions: 1) electrolysis and 2) thermochemical decomposition of water. This paper will investigate their unique complementary roles to reduce costs of hydrogen production. Together they have a unique potential to serve both de-centralized hydrogen needs in periods of low-demand electricity, and centralized base-load production from a Nuclear Station. Thermochemical methods have a significantly higher thermal efficiency, but electrolysis can take advantage of low electricity prices during off-peak hours, as well as intermittent and de-centralized supplies like wind, solar or tidal power. By effectively linking these systems, water-based production of hydrogen can become more competitive against the predominant existing technology, SMR (steam-methane reforming).
