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Transient Analysis Of A Coolant-To-Refrigerant Heat Exchanger To Provide Temporary High Performance In An Automotive Vehicle, Abhinav Ravi

Theses and Dissertations

The objective of this thesis is to provide a numerical and experimental design tool to understand the heat transfer analysis of a coolant reservoir being chilled at a sub-ambient temperature with a goal of eventually providing a transient burst in performance. A high performance vehicle usually has a liquid charge air cooler that cools air before entering the engine. This liquid charge air cooler cools the air by using a specific coolant coming from the low temperature radiator. This study involves a coolant reservoir independent of the low-temperature radiator to provide coolant at a sub-ambient temperature to the liquid charge …

A Novel Numerical Method To Analyze Laminar Flow In Serrated Plate-Fin Heat Exchanger Designs, Nabila Rubaiya

Theses and Dissertations

In the present research work, a simple numerical method has been explored to calculate the performance of serrated plate-fins. The numerical data of heat transfer and pressure drop performances have been compared with the available literature [6, 21], by means of calculating Chilton-Colburn j Factor and Fanning Friction Factor f, respectively. The numerical findings show good agreement with the experimental results from literature. Hence, the numerical analysis procedure proposed in this paper can be used to predict the performance of new designs of plate fins including different types of notched serrated fins. A detailed calculation and analysis of results have …

Pulsed Flow Jet Impingement Cooling: Evaluation Of Heat Transfer Performance, Michael Lee Hamman

Theses and Dissertations

This thesis presents findings from an experimental and numerical investigation into merits of pulse coolant flow as an improvement to impingement cooling. A series of simulations were conducted at Re=12k and 30k for frequencies up to 20Hz and amplitude ratios up to 70% of mean mass flow and standoff and nozzle spacing equal to three diameters. Square waveforms were found to degrade at low frequencies near 1Hz, rendering the use of square waveforms as an invalid mass flow specifications for inlet boundaries in computational predictions. The Power Consumption Ratio is introduced for comparing pulse and steady flow configuration’s energy consumption. …

Numerical Study Of Thermal Performance Improvement By Novel Structures In The Building Energy Storage Systems, Junling Xie

Theses and Dissertations

In this work, numerical studies were conducted to investigate the effectiveness of two fin-like novel structures used for heat-transfer enhancement in two building energy storage systems including thermal energy storage and battery energy storage.

Firstly, thin layer ring structure was numerically investigated for thermal performance improvement in the thermal energy storage. From the results obtained in this study, the area ratio can be increased by 4% when using the thin layer ring during the same time period. The thin layer ring structure can shorten ice formation period and increase its efficiency. Further study was conducted for the factorial analysis of …