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 12 of 12 for “"Temperature stratification"”.
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Scale model studies of displacement ventilation
… plan office environments, focusing on vertical temperature stratification. It explores the possibility of improving the performance of these systems by reducing the temperature stratification at lower levels and allowing them to operate with high cooling loads without exceeding thermal comfort …
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On fuel selection in controlled auto-ignition engines : the link between intake conditions, chemical kinetics, and stratification
… predict when the high-load limit is reached. Temperature and fuel concentration stratification, and the degree that they can be used to relax the constraint on the highload limit, were then examined. The effectiveness of stratification was then related to the chemical kinetic behavior of …
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Assessment of Varying Model Representations in CFD Simulations
… is analyzed to look at both the velocity and temperature stratification of the packed bed of corn within the drying chamber. The model refinement techniques used in these systems involved refining the computational grid and increasing the complexity of the simulated systems. A recommended …
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Level of UV-B Radiation Influences the Effects of Glyphosate-Based Herbicide on Fitness of the Spotted Salamander
… of surfactant or a complex interaction between temperature stratification and trophic relations is potentially responsible for the observed patterns in survival and body condition. However, the mechanistic underpinnings of improved immune function and morphological differences are less clear. As …
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Modeling of opening characteristics of an atrium in natural ventilation
… been limited up to now. This thesis studies the temperature stratification and air flow rates inside atrium buildings in purely buoyancy-driven ventilation. Ventilation effects in models with different heat sources, opening locations, opening sizes and numbers of floors are compared using CFD …
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Near and far field models of external fluid mechanics of Ocean Thermal Energy Conversion (OTEC) power plants
… provide renewable energy by making use of the temperature difference between the surface ocean and deep ocean water in a Rankine cycle. An OTEC plant pumps huge volumes of water from the surface and nearly 1 km depth, and releases it at an intermediate depth. The effects of this enormous flux …
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Optimizing the scavenging system for high efficiency and low emissions: a computational approach
… efficiencies. The delivery tank pressure and temperature histories are important to enabling steady charging, high operating compression ratio and low pumping power consumption. Stratified scavenging and over-expansion operating schemes can significantly improve the efficiency of the engine …
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Computational fluid dynamics modeling of a continuous tubular hydrothermal liquefaction reactor
… and algae into hydrocarbon fuels at elevated temperature and pressure. However, E2-Energy is not yet commercially feasible due to a lack of reliable, up-scaled HTL equipment despite its promising prospective. Improving the efficiency of the hydrothermal conversion is an effective way of …
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Numerical modeling of resonant internal seiche triggered by unsteady withdrawal
Most lakes and reservoirs are temperature stratified for some period during the year, at which time a typical fresh water body can be divided into a well-mixed, warm, surface layer called the epilimnion, which is separated from the colder and relatively stagnant bottom water, called the …
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ENERGY SAVINGS AND THERMAL COMFORT OF SEPARATE SENSIBLE AND LATENT COOLING AIR-CONDITIONING SYSTEMS
… better thermal comfort in terms of reducing temperature stratification from head to feet by 0.8 K and providing higher operative temperature at the foot level in winter. Numerical models were developed to simulate the operative temperature field created by the low ΔT indoor heat exchanger. …
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Mathematical modeling of D.C. electric arc furnace operations
… of other arc characteristics. Universal maps of temperature, magnetic: flux density, and axial velocity are also reported in terms of simple analytical expressions. The practical effects of the two main process parameters of the arc region,. i.e. the arc current and the arc length, were analyzed. …
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Numerical Modelling of Wind-driven Hydrodynamics in Shallow Wastewater Ponds and Coastal Estuaries
… field monitoring of water levels, current, and temperatures was used to validate a high-resolution three-dimensional Delft3D model. Hydrodynamics were primarily wind-driven, with smaller contributions from outflows, and circulation patterns were classified into four hydraulic regimes. Vertical …