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 11 of 11 for “"Thermal transients"”.
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System Level Modeling of Thermal Transients in PEMFC Systems
… developed that includes a simplified transient thermal and parasitics model. Model validation is achieved using a small 1.2 kW fuel cell system, due to its availability. While this is a relatively small stack compared to a full size automotive stack, the power, general thermal behavior, and …
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Two-parameter characterization of crack-tip fields during thermal transients
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1994.
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Microwave Signal Generation Using Self-Heterodyning of a Fast Wavelength Switching SG-DBR Laser
… frequency step measurements have shown inherent thermal transients of approximately 200 ns upon wavelength switching. From the square wave switching profile, switching times of approximately 24 ns were achieved.
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Data acquisition systems for three-dimensional representation and analysis of surface topography and surface temperatures in tribological processes
… in three dimensions. A method for studying fast thermal transients in the sliding system is suggested and demonstrated. This method uses the unfiltered signal from the IR microscope to detect the transients. Some simple tests were conducted to observe the general performance of the systems …
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A Study of Earth Radiation Budget Radiometric Channel Performance and Data Interpretation Protocols
… have been developed to characterize the optical/thermal-radiative behavior, the dynamic electrothermal response and the structural thermal transients of radiometric channels. These models, applied to a satellite-borne scanning radiometer, are used to determine the instrument point spread function …
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Sizing hybrid green hydrogen energy generation and storage systems (HGHES) to enable an increase in renewable penetration for stabilising the grid.
… the load profile. The effect of the electrolyser thermal transients at start-up on the overall quantity of hydrogen produced (and accordingly the energy stored), when operated in conjunction with an intermittent renewable generation source, has also been modelled. Finally, a mass-transfer …
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An Investigation into Improving the Repeatability of Steady- State Measurements from Nonlinear Systems. Methods for measuring repeatable data from steady-state engine tests were evaluated. A comprehensive and novel approach to acquiring high quality steady-state emissions data was developed
… formation mechanisms invariably focus on thermal transients and preconditioning of internal surfaces. This work sought data quality improvements using three principle approaches. An adapted steady-state identifier to more reliably indicate when the test conditions reached steady-state; …
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Investigation of pressure-tube and calandria-tube deformation following a single channel blockage event in ACR-700
… of molten Zircaloy (Zry) from the fuel pin (d) Thermal interaction between the molten Zry and the PT (e) Localized bulging of the PT (f) Interaction of the bulged PT with the CT Simple one-dimensional models were adequate to describe (a), (b) and (c), while the three-dimensional nature of (d), …
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ThermoSolar and photovoltaic hybridization for small scale distributed generation : applications for powering rural health
… concentration ratio, power block size and thermal storage are examined, and the key role of thermal capacity in the system is highlighted. A semi-dynamic version of SORCE is developed to support optimization amongst system components in a simulated operating environment including insolation …
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Modeling the Transient Effects of High Energy Subsystems on High-Performance Aerospace Systems
… principles. This thesis examines the transient thermal loads that a high-energy weapon system introduces into a high performance aircraft using fundamental thermodynamic and heat transfer analyses. The high-energy weapon system employed in this research contains power storage, power conditioning …
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An Enhanced Transient Solid Oxide Fuel Cell Performance Model
… in reactant supply and load demand) electrical transients, inclusive of the simulation of electrolysis, and the electrochemical light off phenomenon. One key result of the electrochemical light off simulations was that the realization that electrochemical parameters such as cell potential may be …