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 23 for “"louver"”.
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A study of consumer acceptance of the Midget Louver in metropolitan Boston
Thesis: B.S., Massachusetts Institute of Technology, Department of Business and Engineering Administration, 1948
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Smart Prismatic Louver Technology for Enhanced Daylighting and Management of Thermal Loads in Green Buildings
… The proposed Liquid Filled Prismatic Louver (LFPL) system presented in this M.S. Thesis combines both energy saving strategies, i.e., daylighting and thermal energy harvesting into a single platform.</p> <p>In this M.S. Thesis, experimental testing was performed for both daylight …
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Effects of Louver Length and Vortex Generators to Augment Tube Wall Heat Transfer in Louvered Fin Heat Exchangers
… particular type of compact heat exchanger, the louvered fin heat exchanger, has been used heavily in the automotive and air conditioning industries. Over the last several decades, the majority of the work towards improving louvered fin exchanger efficiency has focused on designing more efficient …
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Predicting the Air-Side Thermal -Hydraulic Performance Characteristics of Flat-Tube Louver-Fin Heat Exchangers Under Dry and Wet Conditions
… numerical methods. When condensate obstructs the louver gap, boundary layer re-starting does not occur, and the most important heat transfer enhancement mechanism in these flows lost. It is shown that surface tension can maintain inter-louver condensate bridges against gravity and flow-generated …
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Flow, Heat Transfer, and Pressure Drop Interactions in Louvered-Fin Arrays
… of the most common interrupted surfaces is the louvered fin. The goal of this work is to develop a better understanding of the flow and its influence on heat transfer and pressure drop behavior for both louvered and convex-louvered fins. Specifically, this research explores the end effects of …
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The Effects of Upstream Boundary Layers on the NGV Endwall Cooling
… endwall cooling schemes, jump cooling and louver cooling, result in different interactions between the injected coolant and the mainstream, leading to different cooling effects. This study investigates these two cooling schemes on the endwall cooling experimentally and numerically. Wind …
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UNSTEADY PRESSURE MEASUREMENTS IN A SUPERSONIC INLET DURING UNSTART SIMULATIONS
… within a supersonic wind tunnel, where a louver system activated by a traverse mechanism induced back pressure, allowing a shock train to be formed and eventually pushed forward, leading to the inlet model unstarting. An upgraded data acquisition system was built so that the experiment …
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Natural ventilation through windows in a classroom (CFD analysis crossventilation of asymmetric openings: Impact of wind direction and louvers design)
… in a façade such as an angle and geometry of louvers, building orientation and wind direction. Therefore, the geometry of louvers and wind direction can have a considerable influence on the cross-ventilation flow. Many studies on natural ventilation have been released in the past, however, a …
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Heat Transfer Measurements and Optimization Studies Relevant to Louvered Fin Compact Heat Exchangers
… is typically the air side of the heat exchanger, louvers are manufactured into the fins. Louvered fins initiate the growth of new boundary layers such that the average convective heat transfer coefficient is higher than that which would occur for a continuous fin. Approximately 85% of the total …
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Longitudinal Vortex Generation to Enhance the Performance of Compact Heat Exchangers: Flow and Heat Transfer Behavior for Plain and Interrupted Fins
… full-scale implementation of a VG-enhanced multi-louver heat exchanger. The heat transfer and pressure drop performance under both dry- and wet-surface conditions were determined through wind-tunnel experiments. Average heat transfer enhancements of 21% for dry conditions and 23% for wet …
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Air-side condensate management: Drainage channels in heat exchangers
… retention characteristics of compact flat-tube louver-fin heat exchangers is presented. Various geometries of drainage channels are engraved on surrogate tubes in contact with fin stock. Two fin designs are tested using a dynamic dip testing method, and four designs are tested in a small wind …
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Measurements and Predictions of the Heat Transfer at the Tube-Fin Junction for Louvered Fin Heat Exchangers
… investigation, a scaled-up model of the louvered fin-tube wall was tested in a flow facility. Although computational results for the isothermal tube wall are shown, control of the experimental isothermal tube wall proved to be unrealistic and only heat transfer measurements along the …
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Thermo-hydraulic study of inclined louvered fins
… Dividing the fin surface into smaller units, louvers, has proven to be very effective. These interrupted fin designs result in increased heat transfer due to boundary layer restarting and at higher Reynolds numbers they promote self-sustained flow unsteadiness which further increases the heat …
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CFD investigation of the aerodynamic performance of a single-stage and a two-stage centrifugal fan
… of damper settings are applied to the inlet louver dampers of the single-stage and the two-stage model to analyse the part-load performance of the fans. Finally, a preliminary transient analysis is conducted on a single-stage model.
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Predicting Motion of Engine-Ingested Particles Using Deep Neural Networks
… (CFD) study of particle-laden flow around a louver-geometry. However, the model trained with particle data from combined canonical flows fails to accurately predict particle accelerations in the CFD flow field.
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Metal foams as novel materials for air-cooling heat exchangers
… is considered as a replacement for conventional louvered fins in brazed-aluminum heat exchangers. Closed-loop wind tunnel experiments are conducted to measure the pressure drop and heat transfer performance of metal-foam heat exchangers. In addition to characterizing the air-side pressure-drop …
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Performance investigation of a naturally driven building ventilation terminal.
… components (in isolation) were identified as the louver angle, distance between louvers and the number of louvers (now subject to patent number 0809311.4). Each of these geometrical variations provided an increase in performance over the benchmark case in the range of 27 - 45%. An optimum …
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Aqua House
… and comfort of occupants. There is a robotic louver system that can be programmed to allow direct light or to shade an area of the building depending on the needs of the plants or occupants beyond. This thesis is designed to be a building of a new typology in an urban environment and introduce …
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Instability of flow boiling in parallel microchannels
… transient heat transfer problem of louvered fins bounded with multiport aluminum plates using commercial software (ANSYS FLUENT). While the fin geometry was kept constant in all simulations, two different multiport plate configurations (11 round ports, D=1.2 mm; and 22 square ports, …
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Experimental investigation of local air-side heat transfer coefficients of heat exchanger fins via an absorption-based mass transfer method
… include different fin types (plain, wavy, louver, and slit), tube bundle arrangements (inline and staggered), tube diameters (9.52 mm and 12.7 mm), and the number of tube rows (3-8). The averaged HTCs have been calculated by taking the arithmetic mean of the local HTCs of each pixel on the …
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