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 57 for “"thermal stratification"”.
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Thermal stratification in solar storage tanks
The purpose of the work was to investigate the thermal stratification in solar storage containers. Three domestic thermally stratified hot water storage containers were designed with the main object of improving and stabilizing thermal stratification of the stored water as a means of improving the …
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Thermal stratification in enclosed fluids due to natural convection,
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1970.
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Study of airflow and thermal stratification in naturally ventilated rooms
… In reality, however, the air in a room is often thermally stratified, and the air temperature at occupant level can be significantly lower than the exhaust temperature. The final goal of this thesis was to develop a set of criteria to predict the vertical temperature profile in naturally …
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Determining thermal stratification in rooms under mixing and displacement ventilation
… intensity) and radiation heat transfer on the thermal stratification of the air and the temperatures of the surfaces in the space. The air stratification and the temperatures of the surfaces are two important parameters when determining thermal comfort conditions in the room. Different room …
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Diagnosing the variability in temperature and velocity in the Middle Atlantic Bight
… that lead to the breakdown of summertime thermal stratification, and how the processes which reduce stratification vary from year to year. In summer, the atmosphere heats the surface of the ocean, leading to strong thermal stratification with warm water overlying cool water. During fall, …
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Changes in Water Quality as Related to Retention Time Within Red Rock Reservoir, Iowa, Summer 1972
… phosphates and sulfates. Findings. Weak thermal stratification occurred in late June and early July but was prevented from becoming stable by high inflow. The average retention time was 11.7 days. The reservoir water was completely replenished five times during the study. No correlation …
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Experimental and numerical investigation of turbulence in Stable Boundary Layer flows
… diurnal local circulations, differing by the thermal stratification in the basin. In particular, the influence of thermal stratification on the outbreak of a valley-exit wind coming from a tributary valley is investigated, and the influence of such type of flows on turbulence anisotropy in …
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Thermal-fluid characterization and performance enhancement of direct absorption molten salt solar receivers
This thesis presents an in-depth thermal-fluid analysis of direct absorption molten salt solar receivers. In this receiver concept, an open tank of semi-transparent liquid is directly irradiated with concentrated sunlight, where it is absorbed volumetrically and produces internal heat generation. …
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Estocagem por estratificação térmica de líquido em reservatório
Storage of energy using the thermal stratification of a liquid in a tank, is a present theme of research and deve lopment, because i ts enormous applicability; Considering the energy conservation equations, it is proposed a transient one-dimensional semi-empirical model to the storage system, …
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Better understanding human impacts on river thermal regimes under climate change
… greatly modify the response of river thermal regimes to climate change. Dams impound large water bodies, decrease surface to volume ratios, and increase water residence times. All of these changes affect the interaction between surface meteorology and river systems. During warm …
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Prediction of temporal and spatial phytoplankton change in Rutland Water
… appeared to be suppressed as a result of the destratification equipment which caused high mixed depth (Zm) to euphotic depth (Zeu) ratios. Spring was dominated by diatoms, usually nutrient limited, with the presence or absence of ice-cover influencing the species composition. Colonial greens, …
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Near-inertial internal Poincare waves in Lake Michigan: Seasonal variability and effects on lateral dispersion and turbulent mixing
… and is supported by as few as 1-2 degrees of thermal stratification over 150m. The strongest Poincaré wave activity is seen to correspond to the period of strongest summer thermal stratification. ^ The vertical shear created by near-inertial internal Poincaré waves is not only an energy source …
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Erweiterung der `Localized Near Field' Theorie zur Bestimmung von Quellstärken bei beliebiger thermischer Schichtung in einem Waldbestand
… sublayer. To apply the LNF during arbitrary thermal stratification it is necessary to find parametrisations for the input parameters standard deviation of vertical velocity and Lagrangian integral time scale. These are derived from values measured inside a pine forest. Using these …
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Trends in Sedimentary Diatom Assemblages Metal(loid) Concentrations Over the Last ~200 Years in Lake Temagami in Response to Multiple Environmental Stressors
… Cyclotella spp., are examined as indicators of thermal stratification and climate-driven changes in lake dynamics. Through the analysis of sedimentary diatom assemblages from three strategically selected cores, close to the town (Core 1), at the initial widening of the northeast arm (Core 2), …
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Investigation of standard test procedures for integral storage solar domestic hot water systems
… tests were performed to determine the thermal performance of two commercial integral storage collectors for solar domestic hot water systems. These tests were performed under a variety of ambient conditions and irradiance levels, both with and without forced circulation and noontime hot …
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Spatial heterogeneity in isotope and biomarker distributions : insights from the End-Devonian OAE in Western Canada.
… critical in tropical regions where stable thermal stratification in the water column is periodically disrupted by surface ocean current divergence experience upwelling, where deep, nutrient-rich waters rise to the surface, supporting high primary productivity. This comprehensive study of …
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The effect of stratification on wind-driven, cross-shelf circulation and transport on the inner continental shelf
… model are used to describe the effect of stratification on inner shelf circulation, transport, and sediment resuspension height. Thermal stratification above the bottom mixed layer is shown to cap the height to which sediment is resuspended. Stratification increases the transport driven by …
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The effect of stratification on wind-driven, cross-shelf circulation and transport on the inner continental shelf
… model are used to describe the effect of stratification on inner shelf circulation, transport, and sediment resuspension height. Thermal stratification above the bottom mixed layer is shown to cap the height to which sediment is resuspended. Stratification increases the transport driven by …
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Biophysical interactions in the Iceland Basin
… carbon pump may weaken as a result of increased thermal stratification and therefore reduce upward nitrate flux to drive nitrate-based export production. This was in fact confirmed at least in the study region which is dominated by regenerated production (f-ratio <0.5) which in turn suggests a …
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Liquid Sodium Stratication Prediction and Simulation in a Two-Dimensional Slice
… When temperatures change due to transients, stratification can occur. It is important to understand the stratification behavior of these large volumes because stratification can counteract natural circulation and fatigue materials. This work features steady-state and transient simulations of …
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